Troubleshooting Guide
Contents
1. 52 Appendix A eges dili E TR T Um 54 Tire Pressure Control System Electrical Schematic 04 400 55 List of Illustrations Figure 1 Tire Pressure Control System Components eene nennen nnns nennen nnns nnns 6 Figure 2 Simplified System Schematic 8 Figure Operator Control Panel 9 Figure 4 Entering the Programming 14 Figure Fiter Change ERREN 17 Figure lt Gonmector 54 Figure 7 Eleciical t 55 Introduction Tire Pressure Control System Spicer s Tire Pressure Control System features dashboard control of tire air pressure through e Simple push button operation e Independent Steer Drive and Trailer operation e Electronic braking priority for air system e Vehicle speed sensing and response capability Self diagnostics Purpose and Scope of Manual This manual explains how to diagnose problems or failures of the Spicer Tire Pressure Control System While this manual also includes a basic summary of system components and control operation it does not provide all information necessary to fully support an installed Tire Pressure Control System For information on service installation and full system operation request appropriate2. _ iro aqu System Mode Condition Possible Causes Pressure check only slow inflate Faulty compressor Restricted flow at wheel valve air filters Crimped or plugged lines Pressure check only Slow deflate Restricted flow at wheel valve air filters Plugged restricted wheel valve exhaust port Leaking lines Plugged or restricted Pneumatic Control Unit vent port Possible causes are listed in order of likely occurrence Code Description Code 4P displays if a channel inflates or deflates too slowly The correctly diagnose the faulty component connect the Diagnostic maximum allotted time for each channel is 40 minutes for an inflate or Tool see Section 5 for test equipment and descriptions and follow the 20 minutes for a deflate The most likely cause is a faulty compressor procedure in the 3P troubleshooting tree or similar problem resulting in inadequate air supply to the Tire Pressure l oe Control System See Troubleshooting Tips on page 20 for general guidelines on system diagnostics If the system is able to generate a sufficient air supply Code means that a leak or restriction exists in an air passage The components that may contain a restricted or leaking air passage include Wheel valve air filters e Pneumatic Control Unit PCU vent port restriction e Air supply lines Wheel valve exhaust port deflate mode only 38 Troubleshooti
3. Channel confirmation Tire Pressure Control m Rs TX OUS Le BEL cuu u i sAr J 1 mp ee failure Leaking line between wheel valve and tire Possible causes are listed in order of likely occurrence Air Pressure Check Note that the Tire Pressure Control System is not continuously pressurized pressure checks occur on a periodic basis During tire pressure checks the system delivers compressed air to each channel for approximately two seconds while monitoring the pressure in that channel Code Description Code displays if a channel fails to confirm tire pressure Following an inflate or deflate of a given channel the Tire Pressure Control System will return to that channel to confirm or double check the new pressure If the pressure has dropped the system will reinflate and then reconfirm that channel After multiple confirmation attempts the system will log a 1OP and the channel will become inoperative Wheel valve shut off failure A confirmation failure can be caused by Damaged or leaking tire Leaking air line between the wheel valve and tire Wheel valve failure To correctly diagnose the faulty component connect the Diagnostic Tool see Section 5 for test equipment and descriptions and follow the procedure in the 10P troubleshooting tree See Troubleshooting Tips on pag
4. Warning Icons The two warning icons report operating problems You must take immediate action to either reduce vehicle speed or check tire condition Reduce Vehicle Speed This signal reports that the vehicle speed is too fast for the pressure selected You must either reduce speed or select a higher pressure by pressing the appropriate key Continued operation in this mode will result in the system automatically selecting a more appropriate pressure setting Check Tire Condition This signal reports that one tire is at a significantly lower pressure than the others and could indicate that a tire is not holding pressure The operator should immediately stop the vehicle and identify the extent of tire damage The system may be used to re inflate the low tire if damage is deter mined to be minimal e g a minor puncture or slow leak by selecting RUN FLAT The system should not be used to inflate tires with more substantial damage such as large cuts chunk outs or structural defects i IL TODA Pressure Control 3 Ls punc o6 bar psi Figure 3 Operator Control Panel 10 Operator Instructions me ee oma Tire Frassure Contro 4 pmo o DG SSS ou Oe Digital Display The display shows either tire pressure or fault codes for the channel indicated by the illuminated inner tire rings see Channel Indicators When the system is actively changin
5. Control System will automatically select the appropriate pressure Addition ally a warning icon will inform the driver to stop and check the tires if the system senses conditions that may indicate tire damage Air Seal life When the Tire Pressure Control System is idle not inflating deflating or checking pressure all tire air pressures are isolated from the Tire Pressure Control System Tire pressure isolation extends seal life because the seals are not under continuous pressure Isolation also provides fail safe operation of the vehicle if the Tire Pressure Control System is disabled Operation Tire Wheel Wheel Valve Valve Compressor Dryer Speed Sensor Primary ee ee and Secondary Wet h i Tanks ____ YT _ _ 1 u Pressure Pressure Control Tran Unit Transducer Pressure Switch Wheel Valve Tire Tire Wheel Valve Tire System Key Trailer Electrical _____ 1 Figure 2 Simplified System Schematic Operator Instructions Operator Controls The dash mounted Operator Control Panel is the sole interface for display of operator information and for key entry of system instructions Figure 3 shows the Operator Control Panel The following sections explain the purpose and operation of all Operator Control Panel features
6. O ring fitting Use a screwdriver to dislodge the air filter from the wheel valve Discard the used air filter Air Filter Figure 5 Air Filter Change 17 18 Diagnostics This section covers the equipment and procedures used to find and correct Tire Pressure Control System problems Test Equipment Tire Pressure Control System troubleshooting can be performed at three levels Operator Control Panel codes e Hand held tester e Personal computer based diagnostics Regardless of the testing equipment used the troubleshooting procedures will be based upon the diagnostic fault codes The hand held tester and the personal computer system offer the advantages of com puter aided testing without interpreting fault codes Tire Pressure Control System Diagnostics The onboard system diagnostics are an important feature of Spicer s Tire Pressure Control System This section describes the use of fault odes to identify Tire Pressure Control System operating problems Tire Pressure Control System uses an alpha numeric code displayed at the Operator Control Panel to identify the type P Pneumatic or C Component and area of fault number An example code is 1C where 1 power supply and C component Refer to the fault code chart page 21 for more detailed information on fault codes Historical Fault Codes Any time a fault occurs in the system an active fault code will be displayed by the Operator Control Panel Only t
7. Quiet Mode inflate deflate of particular tire Malve stem core not removed on tire Innacurate tire pressures Leaking cantrol lines Faulty pressure transducer Faulty Electrical Control Unit Possible causes are listed in order of likely occurrence Refer to Select Key in section 3 Operator Instructions Remove hose fram tire valve stem and remove core Replace hose BP and 11P Miscellaneous Condition Operating problems that do not trigger fault code Air Leaks Aur bleeding from drive axle vents Tires fail to deflate when lower pressures are requested Leaking tires bleeding audible through Pneumatic Control Unit when ignition is turned off Other Apparent continuous operation or slow inflates or deflatas System stopped in middle of inflate or deflate display shows steady arrow before reaching targeted pressures Wheel end leak Trailer present not detected Troubleshooting Possible Causes Since a fault code was not set these conditions may be universal and call for a troubleshooting routine ir seal degradation Pneumatic system problem Damaged tire Loose connection batwean wheel valve and tire Faulty wheel valve Wheel valve is leaking back through control lines Between mode Trend fault Intermittent transducer short or open Faulty air or oil
8. amp and pins G1 amp B3 Repair completed measured voltage match battery voltage reading obtained in previous step Inspect for failure in SWACC circuit x including vehicle power panel and or ground connections Repair replace as indicated YES Disconnect Look short ia ALY TENA circuit by making continuity chack between relay harness black 2 and ground inspect harness for damage RLY TENA circuit Repair replace as indicated 23 Troubleshooting Code 3C type Speed Sensor i 00 oo rE _ System Mode Condition Possible Causes SSS NR Inflate only Bad connection Sensor disconnected or loose plug Either speed sensor wire is open broken wire Either speed sensor wire is shorted to ground bare wire is touching the frame Faulty speed sensor Faulty Electronic Control Unit No speed signal Sensor actuation failure Tang drive broken disconnected on mechanical sensor Gap not adjusted correctly on pole sensor Vehicle started 15 to 20 times without being moved Sensor wires shorted together Code Description Speed Sensor Harness Connector Code 3C indicates a faulty speed sensor signal which can be set by one of two conditions e A wir
9. between relay hamess Wack pin 3 and ECU 30 way connector pin H2 Did active fault clear om un rapair harness 33 34 Troubleshooting Code 1 No Deflate Signal Possible Causes Tire Pressure Control mmm System Mode Plugged or restricted Pneumatic Control Unit vent line Faulty Pneumatic Control Unit Condition Inflate only inadequate vacuum in the Pneumatic Control Unit Inflate only No sustained vacuum in control lines Possible causes are listed in order of likely occurrence Code Description Code 1P indicates inadequate vacuum in the Pneumatic Control Unit PCU prior to channel selection or failure to sustain a vacuum in a control line following channel selection Code 1P will be set when the nominal vacuum of 26 Hg drops to 20 Hg Code 1P can be generated by one channel or multiple channels When a deflate is requested the system first shuts off all the channel control lines and generates a vacuum in the Pneumatic Control Unit alone A failure to generate this vacuum will result in a 1P Once the vacuum has been established in the Pneumatic Control Unit the desired channel control line s are opened and a vacuum i
10. compressed air to each channel for approximately two seconds while monitoring the pressure in that channel Code Description Code 5 indicates an extreme pressure loss The most likely cause is an open line which would have a clearly audible leak during inflation A secondary cause could be a faulty pressure switch failing to open at wet tank pressures below 80 psi Other components that can cause a code 5P e Faulty Pneumatic Control Unit PCU Restricted line between the wet tank and Pneumatic Control Unit Faulty pressure transducer e Open line from Pneumatic Control Unit to channel To correctly diagnose the faulty component connect the Diagnostic Tool see Section 5 for test equipment and descriptions and follow the procedure in the 4P troubleshooting tree See Troubleshooting Tips on page 20 for general guidelines on system diagnostics Troubleshooting Tree Code 5 Low Pressure Reading Using the diagnostic identity the channal steer drive ar trailer Initiate inflate made tor the faulty chanel Repair faulty components and recheck system Halter fo Service Mannal Verity thal the pressure switth opens when ihe wel tank below BD psi Does the Replace pressura switch and presume recheck system open y3 YES there restricted line Maka repairs to faulty between the wel ES components and recheck sys
11. documents from your Spicer representative e Service Manual e Installation Guide Operator s Guide Organization of Manual The following is an overview Section 1 Introduction Describes the purpose scope and organization of this manual as well as introduces the Tire Pressure Control System Section 2 Operation Reviews the components that make up the Tire Pressure Control System as well as gives a simplified scenario of how the system functions Section 3 Operator Instructions Describes how to operate the system with the Operator Control Panel Section 4 General Service Guidelines Covers the requirements of the air dryer line replacement and wheel valve filter maintenance Section 5 Diagnostics Covers the procedures and tools for running diagnostics on the Tire Pressure Control System Section 6 Troubleshooting Covers the procedures for finding and isolating causes in addition to reference pages fault codes and cross references to the Tire Pressure Control System Service Manual Appendix A Tire Pressure Control System Wiring Diagram Includes component connectors and electrical schematic Operation Component Description The following describes how each component of the Tire Pressure Control System functions Figure 1 shows the approximate location of each component Wheel Valve All axles under tire pressure control incorporate a wheel valve at each wheel end Dual wheels are typically connecte
12. ground Relay Harness Block ECU 30 way Harness Connector 3 1 Troubleshooting Tree Code 1 3C Type Relay Check conditian af fuse on VBATT circuit near Switch off ignition Disconnect harness connectors Test RELTENA vehicles power panel circuit as follows Verity cantinuity between retay harness block pin 2 and ECU S0 way harness connector pan F1 tise ND 5 there continuity Inspact and ir h repair Swit off ignition relay and check condition af relay by Measuring resistanca across relay pins 1 and 2 YES Switch on ignition Verify zero volts between relay harness lock 2 and ground Is coil alther open or Replace relay _ shorted YES Inspect and repair harness Chack condition of VBATT circuits by measuring voltage across Relay harness pin 5 and vehicle grownd Relay harness connector pin 1 and vehicle ground at battery Inspect and repair darmsaged harness voltage E relay if active faut clears upon vehicle startup Switch off ignition Check cantinuity between relay harness block pim 3 and ECU 30 way connector pin E1 Da both VBATT circuits measure 15 hara YES inspect and repair harness _ Check continuity
13. standard operation the Electronic Control Unit will check tire pressures every 5 to 15 minutes to make sure that pressures are maintained at selected settings e Immediately after a pressure increase the pressure is rechecked after approximately 30 seconds e During the run flat mode tire pressures are checked more often During all of the above checks solenoid clicking and air exhausting from the Pressure Control Unit may be heard The following is a description of how the Tire Pressure Control System functions Figure 2 shows a simplified schematic of how the components of the system relate to one another Pressure Regulation The Tire Pressure Control System regulates tire pressures through a series of electro pneumatic controls that supply air to each wheel end through wheel valves The driver operates a dash mounted graphic control panel the Operator Control Panel which commands the system to adjust tire pressure Pressure Mode The driver selects a desired tire pressure mode by pressing buttons on the Operator Control Panel The system responds by adjusting tire pressures to match the road surface and load Indicators on the Operator Control Panel inform the driver of functions currently being performed Operator Control Panel The Operator Control Panel also contains a built in indicator to warn drivers when they are traveling too fast for selected tire pressures If the vehicle s speed is not reduced the Tire Pressure
14. to Vbat Vref transducer reading Faulty transducer Faulty Electronic Control Unit Pressure Transducer ECU 18 Harness Connector Troubleshooting Tree Code 5C Pressure Transducer With ignition off check socket connections at 18 way connector aad at pressure transducer 3 way Are mechanically and electrically Repair connection as necessary YES Check voltage between pressure transducer harness pin and ground with ignition switch an Disconnect both FCU connectors and the pressure transducer connector Is voltage between 49 and 51V Replace pressure transducer YES Check continuity between the Harness Pin Pin B Pin A Check harness indsidg cover for continuity A to A BtoB C To C inspect and repair faulty YES Check har short circuits between each pair of pressure transducer harness pins B pans B and pans 15 there Check hamess inside PCU cover for shorts Ato B BtoC YES Ti Repair harness transducer Measure resistance PCL pressure transducer connector between A and B C and A faulty harness EUR YES YES Repair mini harness M
15. troubleshooting routine leads to a problem Harness Connector with the solenoid itself the Pneumatic Control Unit must be repaired i or replaced If both the solenoid and the circuitry check out the 5 Electronic Control Unit is faulty EE cl fell OHH 2 mu EELCO 1 See Troubleshooting Tips on page 20 for general guidelines on system ML p diagnostics M ECU 18 way Harness Connector Troubleshooting Tree coe 701 801 9C 10C 11C 126 Type SOlenoids 7C Steer 11C Deflate 8C Drive iC Control 9C Trailer Repair replace Connections coms or POU Each of the codes 7C through 12C matches one specific solenoid When the troubleshooting instructions refer to connector test points use Chart A to select the pin test point for use with the particular fault code you are diagnosing See Troubleshooting Tips on page 20 for general guidelines on system diagnostics Discesinect ECL harness carmectors Check continuity of hamess pins shown in chart A tor green code PCL harness connector t EGU harness connector CHART A Solenoid Wire Test Points Are circuits continuous Measure at POU harness connector Verity cantenutty behveen amp F and A Verry no continuity between any combination of pens B C D E POU harness connector aad A3 on EDU 30 S
16. wet tank pressure does not rise Atmosphere 00 Pressure check only Vent pressure 16 outside range Trend fault Channel inoperative Channel loses pressure in inflate mode Tire leak confirm Channel fails to confirm Tire leak imbalance Channel inoperative One tire pressure lower than others 21 Troubleshooting Code Type Power tid S711 BE dd Tire Pressure Control system Made Condition Possible Causes Low battery voltage Poor ground connection to Electronic Control Unit Poor switched ignition connection to Electronic Control Unit High vehicle electrical system voltage Faulty Electronic Control Unit Operation Powar out of range No power down not displayed on Operator Control Panel but stored as historical fault Normal operation Relay enable shorted to ground Relay stuck ON RSP1 shorted to battery Faulty Electronic Control Unit Possible causes are listed in order of likely occurrence Code Description ECU 30 way Harness Connector Code 1C indicates a power fault and sets when the system power is outside the acceptable range of 9 to 32 Volts The fault could be caused by low battery power or some other problem with the basic vehicle elect
17. Always use genuine Spicer replacement parts Every effort has been made to ensure the accuracy of all information in this guide However Spicer Axle and Brake Division makes no expressed or implied warranty or representation based on the enclosed information Any errors or omissions may be reported to Dana Commercial Vehicle Products Group 3939 Technology Drive Maumee Ohio USA 43537 General Information Section 1 Introduction Tire Pressure Control cu 4 Purpose and Scope of 4 MIU CRT 4 Section 2 Operation Component M Rc 5 ag eoru C 7 PU HN 7 Section 3 Operator Instructions Quelque Mid ero AMETE 9 Tire Pressure Control System 13 Section 4 General Service Guidelines 16 Fiter ONange _________ 17 Section 5 Diagnostics Se 18 Section 6 Troubleshooting MPOUDISSINOOUMG TIDS 20 PUNE OG SS vce 21 Mec I Uu 22 M Me A 34
18. Connector Config Harness Config Connector Connector Connector Figure 6 Connector Illustrations 54 Appendix A SPEED war SENSOR A SPD GS 1922 02 gt eS Or ITE CUMS OOP TONM H7 103 JI DCP oll 3 LAMF 1 1 A VEHICLE DIAGNOSTIC ___ U e 3 CONFIG PLUGS 2 Axle fF 1 P ff ann laz tH 13 inp 1 B3 CONFIG 7 B Axle PRESSURE 1 SWITCH Figure 7 Electrical Schematic 59 SPICER Drivetrain Products Axles Driveshafts Off Highway Transmissions LONG Thermal Products Transmission Oil Coolers Engine Oil Coolers VICTOR REINZ Sealing Products Gaskets and Seals Cylinder Head Cover Modules Thermal Acoustic Protective Shielding Dana Aftermarket Group PO Box 321 Toledo Ohio 43697 0321 Warehouse Distributors 1 800 621 8084 OE Dealers 1 877 777 5360 www spicerparts com AXTS 0010 Printed in U S A Copyright Dana Limited 2012 All rights reserved Dana Limited SPICER
19. Spicer TPCS SPICER _ Tire Pressure Control System Troubleshooting Guide Older Systems ECU s w Dual Connectors p n 673782 8 673277 AXTS0010 October 2007 General Information The description and specifications contained in this service publication Any reference to brand name in this publication is made as an example of are current at the time of printing the types of tools and materials recommended for use and should not be considered an endorsement Equivalents may be used Spicer reserves the right to discontinue or modify its models and or procedures and to change specifications at any time without notice IMPORTANT NOTICE This symbol is used throughout this manual A WARNINGS Failure to follow indi to call attention to procedures where cated procedures creates a high risk carelessness or failure to follow specific d of personal injury to the servicing instructions may result in personal injury and technician or component damage CAUTION Failure to follow Departure from the instructions choice of indicated procedures may cause tools materials and recommended parts component damage or malfunction mentioned in this publication may jeopardize the personal safety of the service technician or vehicl rator NOTE Additional service information not covered in the service procedures Tip Helpful removal and installation procedures to aid in the service of this unit
20. al Service Guidelines Service Guidelines The Tire Pressure Control System requires normal maintenance much the same as other systems on the vehicle Following are some general rules that apply to Tire Pres sure Control System service Clean and Dry Air Supply The Spicer Tire Pressure Control System requires a constant supply of clean dry air An adequately sized and properly maintained air dryer is critical for continued proper operation of the Tire Pressure Control System Even though the air dryer may be working properly moisture can accumulate in the wet tank during normal operation due to the increase in air consumption It is important to drain the wet tank daily Draining the wet tank completely when the truck is not in use will also help keep moisture under control Line Replacement and Routing When replacing air lines do not allow kinks sharp bends or stretching in order to tighten joints If any tube or hose segment does not appear to fit easily it could mean you are not using the proper part or that you are not following service procedures properly Ensure that replacement lines are the correct length Each segment of the pneumatic system must be secured to the vehicle frame or other installed line After completing assembly of each segment use cable ties to anchor the segment at approximately 18 intervals Caution Proper Tire Pressure Control System operation requires correct air line diameters and lengths for eac
21. any circuit shorted Inspect and YES faulty wire commection ND Replace Switch om ignition functioning Replace ECU _ 2r Troubleshooting Code 5C Pressure Transducer System Mode Condition Possible Causes No operation No pressure No operation High pressure Possible are listed in order of likely occurre nca Code Description Code 5C displays when the Electronic Control Unit ECU receives an unusually high or low reading from the pressure transducer A diagnostic tool will specify which of the two conditions is responsible for setting the code Initial troubleshooting steps involve checking for a shorted to ground or an open pressure transducer circuit If the circuits check out OK secondary causes could involve a faulty transducer or a faulty Electronic Control Unit See Troubleshooting Tips on page 20 for general guidelines on system diagnostics 28 Tire Pressure Control mM z 3 IU LL J Transducer electrically disconnected transducer reading Pressure signal wire open Pressure signal wire shorted to ground Pressure transducer Vref wire open Pressure transducer Vref wire shorted to ground Pressure transducer ground wire open Faulty transducer Faulty Electronic Control Unit Pressure signal wire shorted
22. components that can cause the pressure switch to remain open include IER EY Faulty compressor Leaking lines Compressor governor cut out set too low e dryer needs service e Pressure switch unplugged e Faulty pressure switch e Faulty compressor Open or broken line from wet tank to Pneumatic Control Unit e Crimped or plugged line from wet tank to Pneumatic Control Unit e Faulty Electronic Control Unit To correctly diagnose the faulty component connect the Diagnostic Tool see Section 5 for test equipment and descriptions and follow the procedure in the 7P troubleshooting tree See Troubleshooting Tips on page 20 for general guidelines on system diagnostics Troubleshooting Tree Code 7 Type Inadequate Air Pressure Is the govennor Reset mor cut aut cut out pressure set at 120 125 Service Mangal YES 15 pressure swiloh plugged i1 Plug m pressure switch NO amd retest system Heater Ia Service Using the diagnostic bool verify pressure switch operation Does tha pressure switch close above 110 psi Replace pressure switch and retgst system WD Refer ta Service Manual YES air systam capacity by checking wet tank pressure buldun Time Does the iwel build up pressure vehicle air supp
23. d to one wheel valve at the outer wheel to provide tire pressure balance When the system is idle the wheel valve isolates the tire s from the system thereby extending seal life since the seals are not under constant pressure The valve also ensures fail safe operation should the system become disabled or inoperable The wheel valve provides for inflation of the tires from the vehicle air supply via the pneumatic controller and deflation of the tires upon system 1emand Electronic Control Unit ECU The Electronic Control Unit is the control center for the entire Tire Pressure Control System The Electronic Control Unit receives commands from the driver through the Operator Control Panel and transmits appropriate signals throughout the system The Electronic Control Unit is typically mounted in the cab behind the passenger seat near the Pneumatic Control Unit Operator Control Panel OCP By using the Operator Control Panel keys the operator selects tire pressures for the conditions encountered The panel also displays such system parameters as current tire pressures selected modes and system status The Operator Control Panel is typically mounted on the dash within view and reach of the driver Pneumatic Control Unit PCU The Pneumatic Control Unit is a solenoid controlled manifold that receives commands from the Electronic Control Unit and controls the air system It also contains the pressure transducer which transmits the press
24. e 20 for general guidelines on system diagnostics Troubleshooting Tree Code 1 Type Tire Leak Confirm Using the diagnostic tool identity ihe channel steer drive or trasler irte mode the faulty channel 15 thera damaged tire on the identified channel Rapair tire and retest system YES ls there a waking hess between a iire and wheel valve Replace the hose and ratest system YES wheel valve leaking through the Replace the wheel valve valve exhaust YES and retest system Ur at the PCU vent Fault code 15 mot active Reverify flow chart steps and wait for fault to reoccur 49 50 Troubleshooting Code 1 1 Type Tire Leak Imbalance System Mode Condition Tire pressure lower on one tire than others on same channel Channel inoperative Possible causes listed in order of likely occurrence Air Pressure Check Note that the Tire Pressure Control System is not continuously pressurized pressure checks occur on a periodic basis During tire pressure checks the system delivers compressed air to each channel for approximately two seconds while monitoring the pressure in that channel Code Description Code 11P indicates that either the tire pressure on one tire was read lower than the other tires on that channel or there is an air leak someplace in the system Low
25. ee cover 29 30 Troubleshooting 701 8C 96 10C 1101 120 Type SOlenoids _ 106 Supply ie i din ied 11C Deflate E A Pressure Control 8 Drive Ws 126 Control AN 9C Trailer L s NUR gt 00 E oe System Mode Condition Possible Causes No operation Pneumatic Control Unit Solenoid wire open solenoid failed electrical Solenoid wire shorted to ground diagnostic test Solenoid wire shorted to power 1 or RSP 2 open or shorted to ground Faulty solenoid Faulty Electronic Control Unit Possible causes are listed in order of likely occurrence PCU Connector Code Description Codes 7C through 12C indicate an electrical fault in the Pressure Control Unit PCU System operation is disabled when these faults are PCU Harness detected Connector The system shuts down in fail safe mode and turns off the relay power E 5 to the solenoids ar alls All The troubleshooting tree first tests internal solenoid circuitry Resistance outside the specified range of 7 to 25 ohms indicates a defective solenoid Succeeding steps check continuity of the wire harness circuits between the Pneumatic Control Unit and the Electronic Control Unit ECU If the problem can be traced to a faulty circuit or connector make ECU 30 way the necessary repairs If the
26. g tire pressure on the selected channel a bubble display in clockwise rotation indicates inflation and counterclockwise indicates deflation Fault Indication The exclamation point indicates that the value shown in the digital display is not a pressure but rather a fault code See Fault Codes Section Metric English Indicator This unit of measure indicator tells if the tire pressure is shown in metric bar or English psi units Mode Keys and Annunciator Arrows These keys select pressures appropriate for different surface and loading conditions The annunciator arrow points to the selected key and signals one of two states the arrow is flashing the system is the process of checking or changing pressures e the arrow is lighted steady the selected pressure has been achieved and the system is de pressurized Pd 0 s L U Key Loaded Unloaded This key selects pressures appropriate for either a loaded or unloaded vehicle HWY For high speed travel on paved surfaces OFF HWY For operation on secondary roads EMER For selection of extremely low tire pressures to help free a stuck vehicle A IMPORTANT The EMER key is for extreme conditions only and should not be used for normal driving Operator Instructions Tite Pressure Contra 2g LI EE un uu Loaded Indicator The small arrow pointing to the drive wheels indicates whe
27. h channel Refer to the Tire Pressure Control System service manual for length and diameter information Joint Compound Here are some important DO s and DON Ts regarding the use of thread sealant Do apply a thin coating of compound on male threads of pipe joints tubing connections and other system fittings Don t use any compound on O ring compression or flare fitting connections Instead apply a thin coat of silicone grease to O rings and flares Don t use Teflon thread tape anywhere in the air system Teflon tape shreds can become lodged in valving General Service Guidelines Air Filter Change Note Air filters cannot be cleaned or reused always replace with a new air filter Figure 5 shows the location of the air filter in each wheel valve This filter Oo must be replaced whenever the tire or wheel valve is serviced 4 Install new air filter into wheel valve outlet port Use the illustration as a reference in completing the air filter replacement Install JIC flare to wheel valve outlet port and torque to 16 19 Ib ft as follows 6 Install tire braided hose assembly to wheel valve outlet port and torque to 16 19 Ib ft A Caution Do not Crush the air filter when installing the JIC flare 1 Working quickly to prevent air loss remove the tire hose assembly from the fitting on the outlet port of the wheel valve Cap hose to prevent air loss 2 Remove JIC flare from 9 16 18 straight thread
28. he most recent code is displayed by the Operator Control Panel Historical codes are stored in memory Historical codes can only be accessed by a hand held tester or personal computer Historical codes are automatically cleared after 50 100 starts with no active faults Fault Codes The Fault Codes are described in Section 6 Some fault codes also identify the component that is associated with the problem A list of possible solutions are given in order of most likely occurrence Diagnostics Hand Held Testers An OTC or MPSI hand held tester may be used to read and clear fault codes and to obtain a short description of failures The tester can initiate test sequences for controller outputs and can also read system parameters Personal Computer Based Diagnostics Personal computer based software provides the capability of hand held testers with enhanced display and data ogging capability A personal computer can display multiple parameters and provide more comprehensive descriptions of fault conditions Use of a personal computer requires a serial link assembly such as Kent Moore s part number J38351 and Spicer s Tire Pressure Control System diagnostic software Multimeter Based upon system schematics and aided by component specific fault codes a multimeter can be used to check sensor and solenoid resistances and to find wiring harness faults The multimeter can be used to check the Tire Pressure Control System wiring a
29. ing or sensor connection may cause a 3C fault after approximately 15 seconds Likely causes are wiring problems or bad connections e A mis adjusted or faulty sensor may cause a 3C fault after 15 to 20 ignition key cycles without any speed signal Note This fault may occur if ignition has been cycled 15 to 20 times without moving the vehicle 30 Way See Troubleshooting Tips on page 20 for general guidelines on system Harness Connector diagnostics 24 Troubleshooting Tree Code 3C Type Speed Sensor Turn an agn tion switch 36 appears within 10 seconds the vehicle must moved to clear the fault even after repair Was circuit open harness 28 necessany Check adjustment on threaded pencil speed sensor of drive tang on mechanical speed sensor Did active Sensor Repair as fault clear problem YES Necessary Switch ff ignition Discoanect speed sensor and ECU from harness Check far shorts on ECU 30 way connector K3toJ3 in AS shart as necessany YES ri Check opens Shart speed sensar harness connector and B together and measure continuity between and K3 on ECU Sl way connector 20 26 Troubleshooting Code 4C Control Communications Condition Blank Display System Mode Inflate Only Inflate Only Operator Control Panel displays
30. is ready for programming Refer to figure 4 for sample procedure Press up down arrows to select options or change settings pressure or speed and press SELECT button to record a selection in memory and move to the next step Press the SELECT button repeatedly to move through the program steps one step for each time the SELECT button is pressed Refer to the programming reference chart for specific Tire Pressure Control System pres sure and speed programming steps To complete the programming sequence or exit the programming mode continue to press SELECT button to step through to the end of the procedure Note no buttons are pressed for more than one minute the Operator Control Panel will end the programming sequence saving any changes made during programming 13 Operator Instructions Example for Step 1 Programming see programming quick reference chart bil SELECT at the same time to enter flashing bar or psi programming indicates you have entered programming E Press 10 record a selection Toggl in memory and move to between Metric the next step and English Make selection t Press at the same time to exit programming gt 7 Programming see programming quick reference chart PE ka SELECT SELECT SELECT Lil FEWER Press 10 highway prem programming Prass SELECT six times to go to s
31. lectronic Control Unit See Troubleshooting Tips on page 20 for general guidelines on system diagnostics Harness Connector 11271255 ECU 30 way Harness Co nnector Troubleshooting Tree Code 4C Control Communications vehicle running measure batigry voltage across battery Terminals Ease vehicle power oul of range Refer to valscle service manual YES With ignition Swibched but ngima running measure battery voltage across battery tarmenals Base welche power 15 out of range VER 0 vehicle service manual Oisconmect OCP With ignition on measure voltage beteeen and 2 on OCP namess connector Doss Measured WORage match Repaer harness power or ground NO connections OCP YES Replace CCP switch ignition off Desconmect both ECU connectors Descannect OCP cannectar Chack continuity between FOU harness pin G2 and OCP harness pin 5 harness pin amd OCP hamess pin 6 ispeci and repair faulty communications circuit im harness ls there continuiby YES Check for communication circuits Shorted to ground power or shorted to each other Check beteren OCP harness 5 and pin 2 OCP harness amp anc pin 2 OCP harness 5 and 1 harness pin and pin 1 OCP harness pin 5 and pin 6 5
32. located either before or after the wheel valve e Leaking air lines location The components located before the wheel valve that may e Faulty wheel valve cause a code 9P include y Leaking control lines To correctly diagnose the faulty component connect the Diagnostic Tool see Section 5 for test equipment and descriptions and follow the e Restricted wheel valve exhaust port procedure in the 9P troubleshooting tree e Leaking wheel air seals See Troubleshooting Tips on page 20 for general guidelines on system diagnostics 46 Troubleshooting Tree Code Op Trend Fault Using the diagnostic topl identity the faulty channel steer drive or traser nikate inflate mode at the faulty channal Arg there leaks in the channels control Repair leak and retest limes ar seals Is there damaged tire an the idenbtied channel tire and retest 5ystam YES ls air leasing aut lace POU and retest PEU vent part Is there leaking hose between tira and wheal valve Replace the hose and retest the system YES Fault code is aot active Reverity flow chai steps and wait for to reoccur ls wheel valve leaking through the valve exhaust Replace the wheel valve and retest system ND 4f 48 Troubleshooting Code 1 Type Tire Leak Confirm Condition
33. logo only 4C not displayed on Operator Control Panel but stored as historical fault Possible causes are listed in order of likely occurrence Code Description pawer to Operator Control Panel No ground connection to Operator Control Panel I imer Pressure Control _ d o a i Possible Causes Faulty Operator Control Panel perator Control Panel to Electronic Control Unit lines open Operator Control Panel to Electronic Control Unit lines shorted to ground Operator Control Panel to Electronic Gontrol Unit lines shorted to power Operator Control Panel to Elec shorted together Faulty Operator Control Panel a Faulty Electronic Control Unit ronic Control Unit lines Operator Control Panel Code 4 indicates a communication problem between the Electronic Control Unit ECU and the Operator Control Panel OCP Code 4 will only be observable on a diagnostic tool it will not show on the Operator Control Panel Instead the Operator Control Panel may be blank indicating a power problem or may display only the logo indicating a signal problem All of the troubleshooting steps for code AC involve checking the condition of Electronic Control Unit and the Operator Control Panel circuits If no circuit problems are found Code 4C indicates either a faulty Operator Control Panel or a faulty E
34. lty components Initiate deflate mode an the trailer channel Record the reading Initiate inflate pressure hold on trailer channel Check Tor leaks Make repairs to faulty components Rater ta Service Manual Initiate inflate prassure pn channel with the lowest vacuum reading Check for leaks Make Problem is a cumulative effert of repairs ho faulty components individua channel leaks to Service Manual 35 Troubleshooting Code 3 Vacuum Fault ___ rr us Tire Pressure Control 1 Mo operation Vacuum generation Faulty Pneumatic Control Unit Code Description Code 3P displays when the system is generating a vacuum at a time when the Electronic Control Unit ECU is not requesting a vacuum Creating an unexpected vacuum is a highly unlikely event If it should Vacuum may cause a pressure drop in the wet tank The most likely cause of an unexpected vacuum is a faulty Pneumatic Control Unit PCU Verify the problem before replacing the Pneumatic Control Unit See the procedure in the 3P troubleshooting tree See Troubleshooting Tips on page 20 for general guidelines on system diagnostics 36 Troubleshooting Tree Code 3 Vacuum Fault PROCEDURE Verity the problem Troubleshooting Code 4p Channel Between Modes Tire Pressure Control n
35. ly system and retest Rais ia Service YES Fau cade 15 nit active Ra verity flow chart steps and for fault ta reoccur 43 44 Troubleshooting Code Type Atmospheric System Mode Condition Possible Causes Tire Pressure Control 4 E wo Pressure check only Pneumatic Control Unit Faulty pressure transducer pressure out of range Faulty Pneumatic Contro Unit Faulty Electronic Control Unit Air Pressure Check Note that the Tire Pressure Control System is not continuously pressurized pressure checks occur on a periodic basis During tire pressure checks the system delivers compressed air to each channel for approximately two seconds while monitoring the pressure in that channel Code Description Code displays if the atmospheric pressure reading is out of range The atmospheric pressure reading can be out of range as a result of air bleeding back into the Pneumatic Control Unit PCU or because of a faulty pressure transducer Possible causes are listed in order of likely occurrence The components that can cause a code to be set include e Faulty pressure transducer e Faulty Pneumatic Control Unit e Faulty Electronic Control Unit ECU To correctly diagnose the faulty component connect the Diagnostic Tool See Section 5 for test equipment and descriptions and follow the procedure in the 8P troublesh
36. nd component for continuity ground e broken wires open circuits e shorted circuits e incorrect battery voltage 19 20 Troubleshooting Troubleshooting Tips This checklist outlines some general hints and guide lines that will be helpful in tracking down and correcting operating problems Operator Control Panel only displays one active code Only the most recent fault displays on the Operator Control Panel In troubleshooting be alert for related faults Use of a Diagnostic tool offers the advantage of spotting multiple active faults as well as retrieving historical faults A cleared code alone does not indicate a corrected problem A code is set by a specific fault condition and can be cleared by switching on the ignition It s possible to clear a code i e remove it from the Operator Control Panel display only to have it display again when the fault condition re occurs To insure that a problem is fixed you must run the system through the same operating modes that caused the problem and verify that the fault code does not appear Disconnect both Electronic Control Unit connectors with ignition off To avoid setting electrical fault codes make sure that the ignition is off before unplugging the wire harness connections at the Electronic Control Unit module Also always disconnect both the 30 way and the 18 way connectors never just one Reconnect both connectors before switching
37. ng Tree Code 4p Channel Between Modes Verity Tire Pressure Control System Siam capacity by checking system pressure buildup teri Does the air system build up pressure Repair system and HD n es system Refer te Service Manual YES Using the diagnostic 5001 checx faults to identify the faulty channel Steer drive or trailer Initiate daflate mode on the Identified channel Are the wheel vales Gheck rastriched wheel YES axhaust and wheel valve filters Refer to Service Manual inflabe mode on sdantdiad channel and check for cramped ar restricted limes 39 40 Troubleshooting Code 5 Low Pressure Reading DERE Pressure Control _ Tt ee ee 1 i System Mode Condition Pressure check only Extreme pressure loss pen line from Pneumatic Contro Unit to channel Pressure switch failure sharted closed Pneumatic Control Unit failure supply or control off Crimped or plugged line between wet tank and Pneumatic Control Unit Faulty pressure transducer Faulty Electronic Control Unit Possible causes are listed in order of likely occurrence Air Pressure Note that the Tire Pressure Control System is not continuously pressurized pressure checks occur on a periodic basis During tire pressure checks the system delivers
38. ngs Ie YES Are any wheel readings high YES Place ie channel inta thee inflate mode and check Tor Place ihe channe inte the hold mode and check YES Make repairs to components and recheck syster Refer ta Service Manual Check the topaig Whee valve filter Wheel valve leaks Air Eng leaks Vinee saal tor nir leaks Tire damage Repair taulty components and recheck the syster to Service Maaual Place channel normal mode the system Tor kinwed ines Repair Faulty components and recheck thet system Reter Service Manus YES Replace the wheel valve and rechack ihe system Reiter fo Service 91 52 Troubleshooting Code No Code Type Miscellaneous Although the Tire Pressure Control System is self diagnosing there are some operating problems that do not trigger a fault code The following chart lists these conditions along with possible causes and solutions Condition Possible Causes Operating problems that do nol trigger Since fault code was nal set hese conditions fault cade may be universal and cali for troubleshooting routine Operator Control Panel intermittent Operator Control Panel operation or occasional Logo Only ntermittent ground power connection to Operator Control Panel or Electronic Control Unit N
39. o display or operation Fuses Operator Control Panel fuse blown Bad ground to Operator Control Pane Bad switched ignition line ta Operator Contra Panel Faulty Operator Control Pane Blank Operator Control Panel display Operator Control Panel display rs alway dim and backlighting on Operator Control Pane buttons bright and tied to 12V for dim and backlight System loses programmed tire pressure settings improperly followed programming procedure Faulty Electrical Gontrol Unit Tire Pressure Display shows tires at higher pressure than Tire pressure rises due to temperature are not bled off by the Tire Pressure Control System This is normal operation target yet system does not attempt to detlate No display of pressures and apparent inflate or deflate Lamp 2 wire is disconnected should be grounded tor Page 1 of 2 solution Where fault cades appear refer fo the troubleshooting procedures listed under code 40 Check fuses See wiring schematic page 55 or installation guide Reference programming procedure Replace Electronic Control Panel System will only initiate a deflate mode with a lower target pressure than current target is selected 7P Pressure Imbalance tires on same channel at different pressures Defective hose Glogged fillars Na display of pressures on Operator Control Panel DCP is in
40. on the ignition C Code faults are often connection problems The most likely cause of component faults will be damaged wires or connections As a first step in troubleshooting all C codes switch off vehicle ignition then disconnect applicable connectors and inspect for damage Switch ing off the ignition is required before disconnecting the harness at the Electronic Control Unit but is also a recommended practice before all other electrical system disconnections Clean or repair all bad connections before proceeding System is not continually pressurized When troubleshooting P Code faults keep in mind that the air system is only pressurized as needed for example in the inflate mode This means that such procedures as checking for leaks require the system to be in an active pressurized state Basic vehicle air and power systems are not covered in this guide The Tire Pressure Control System requires air pressure and electrical power supply from the base vehicle systems Diagnosis and service of these systems is outside the scope of this manual Some faults will halt inflate or deflate sequences Upon sensing some fault codes the Tire Pressure Control System will immediately go to the maintain mode This may Cause mode arrows to stop flashing before the system has actually attained the pressures for the indicated mode Troubleshooting Fault Codes When an exclamation point follows the digital display
41. ooting tree See Troubleshooting Tips on page 20 for general guidelines on system diagnostics Troubleshooting Tree Code Type Atmospheric Wsing ihe diagnostic tool read the atmospheric pressure ls the reading between 5 20 pia YES Fault code is not active Re verity flow chart steps and wail for fault t reoccur 5 any audible alr thru the PCU Rapace pressure transducer and verity atmosphere reading YES fault code Na Cade page 53 far audible air in is the reading within range Replace ECU and recheck system Reter to Service Manual 45 Troubleshooting Code OP T Type Trend Fault 1 hs system Mode Condition Possible Causes Channel inoperative _ Loss of channel pressure Damaged or leaking tire in inflate mode Leaking lines Leaking seals Leaking wheel valve Faulty Pneumatic Control Unit Faulty Electronic Control Unit Possible causes are listed in order of likely occurrence Code Description Components located after the wheel valve that may cause a code 9P include Code 9P displays when system pressure is dropping while in inflate mode The air leak that is causing 9P is large enough to more than e Tire damage offset the pressure input and should be clearly audible Him leaks The air leak can be
42. rical system If the vehicle power system checks out satisfactorily other possible causes include bad Electronic Control Unit ECU connections a relay problem or a faulty Electronic Control Unit In inspecting circuits and connections for a Code 1C fault pay particular attention to a bad ground connection which could be causing the fault See Troubleshooting Tips on page 20 for general guidelines on system diagnostics Relay Harness Block I L 22 Troubleshooting Tree Code 1 C Type Power With vehicle sunning measure battery across battery Terminals Check for short RSP circuit by measuring valtage between relay harness block pin 3 and ground ls voltage reading Base vehicle power is out of range gt 42 volts YES Refer ta servaga manual inspect harness damage in RSP circuit Repair ar replace as indicated With ignition swathed on but anpire mat runing measure voltage across battery terminals Base POWE s of Refer to vehicle service manual Switch off ignition Replace relay with known goad component Reconnect ECU and relay connectors Switch ignition on Renlace ECU Switch aft ignition Disconnect both ECU connectors Switch igmirdion Check SWwACC circuit by measuring voltage betwean ECU 30 way harness connector pins G1
43. s generated in them If the system fails to generate a vacuum in the control lines after two attempts it will log a 1P fault Line leaks Air seals oil lip seals Note If a fault occurs on any channel deflation is disabled for all channels Code 1P can be caused by e Faulty Pneumatic Control Unit e Plugged or restricted Pneumatic Control Unit vent line e Line leak Air seal or oil lip seal leaks To correctly diagnose the faulty component connect the Diagnostic Tool see Section 5 for test equipment and descriptions and follow the procedure in the 1P troubleshooting tree See Troubleshooting Tips on page 20 for general guidelines on system diagnostics Troubleshooting Tree Code 1 No Deflate Signal Troubleshooting Tree Using the diagnostic tom enter the deflate mode with channel selected la the PEU lime 15 the vacuum Replace PEU and HO recheck syster gt of restricted Refer te Service Manual YES YES detale made on the steer channel Record the reading Repair POU restriction and recheck system Rejer Ip Service Manual inflate pressure hold on 15 stear channel Check for leaks the vacuum Make repairs ta faulty components gt e Hg Initiate deflate mode on the channel Record the reading inflate pressure held on drive channel Check far leaks Make repairs to fau
44. seal Disconnected trailer air lime connector logged trailer air lines Crimped control line on trailer channel 2 012 Solution Where fault codes appear refer fo the troubleshooting procedures listed under that code Refer to Service Manual Refer to Service Manual Identity tire with low pressure and replace faulty wheel valve OP 10 50 E Refer to Service Manual 2 ___ ___ 2 2225 Refer to Service Manual Trailer detected not present Trailer connector on tracter side doesn t seal when disconnected trailer air line connector Possibla causes are listed in order of likely occurrence Leaking line between Pneumatic Control and HL M a Refer to Service Manual 99 Appendix ic E HHO 05 1 ECU 30 way Harness Connector ECU 30 way Connector ECU 18 way ECU 18 way Harness Connector Connector Pressure Transducer Connector Pressure Transducer Harness Connector 5 Diagnostic Harness Diagnostic Tool slic i Connector Connector QU gt PEU 10 way Harness Connector Pneumatic Control Unit Pressure Switch Pressure Switch Harness Connector Connector Speed Sensor Speed Sensor Harness Connector Connector Relay Harness Block OCP Harness
45. tem lank and PEU Y Reter lo Service Replace pressure transducer and recheck system Replace and recheck system Refer ta Service Manual 41 42 Troubleshooting Code 7 Type Inadequate Air Pressure Pressure check only Pressure switch won t close System Mode Condition Possible Causes Tire Pressure Control Compressor governor cut out set too low Air dryer needs service Pressure switch unplugged Faulty pressure switch Faulty compressor Open or broken line from wet tank to Pneumatic Gontrol Unit Grimped or plugged line from wet tank to Pneumatic Control Unit Faulty Electronic Contro Unit Pressure check only Wet tank pressure too low Possible causes are listed in order of likely occurrenca Air Pressure Check Note that the Tire Pressure Control System is not continuously pressurized pressure checks occur on a periodic basis During tire pressure checks the system delivers compressed air to each channel for approximately two seconds while monitoring the pressure in that channel Code Description Code 7P displays if system air pressure is inadequate to perform a tire pressure check Code 7P displays when either the pressure switch will not close or the wet tank pressure is too low The
46. tep 7 unloaded drive pressure Lill xe SELECT Exit programming Figure 4 Entering the Programming Sequence Operator Instructions Programming Quick Reference Chart X Annunciator Arrows Channel Indicator 5 Speed ded tep atti English a Salting ndicator Indicator Hwy Of Hwy Emer Arrow Merio English On Highway Loaded On Steer Pressure Highway Loaded Orive Pressure Highway Loaded On On Trailer Pressure Drive Trailer Highway Overspeed On On Steer Pressure Highway Untoaded On Highway Unloaded On Drive Pressure 8 Highway Unloaded On Trailar Pressure 4 On On On 10 Off Highway Loaded On On On Steer Pressure 11 Off Highway Loaded On On Drive Pressure 12 Off Highway Loaded Trailer Pressure 13 Off Highuay Unloaded On Steer Pressure 14 Off Highway Unloaded Drive Pressure 15 Off Highway Unloaded On Trailer Pressure e T 16 Emergency Overspaed On 17 Emergency Loaded Steer Pressure 18 Emergency Loaded Drive Pressure Emergency Loaded Trailer Pressure Steer Pressure Emergency Unloaded Drive Pressure Emergency Unloaded Trailer Pressure 15 16 Gener
47. the display is reporting a system fault The following chart provides a brief overview of the Tire Pressure Control System fault codes and the affected system Code Type System Status Fault Cause ic No operation Low power normal operation power dawn 2C Not assigned 3G Inflate only Bad connection speed signal 4C Inflate only Bad connection from Electronic Contral Unit to Operator Control Panel 50 operation pressure transducer reading toa high pressure transducer reading __ TC Sheersolenoid Nooperation Solenoid does not pass electrical diagnostics BC Drive solenoid No operation Solenoid does not pass electrical diagnostics No operation solenoid does not pass electrical diagnostics TOC Supply solenoid No operation Solenoid does not pass electrical diagnostics Deflate solenoid operation Solenoid does not Pass electrical diagnostics Control solenoid operation solenoid does not pass electrical diagnostics No operation Relay open shorted No deflate signal Inflate only No vacuum at Pneumatic Control Unit or in cortrol line m ____ Not assigned No operation Unintentional vacuum Channel between modes Pressure check only Slow inflate or deflate 5 1 Pressure read iow Pressure check Quick loss of pressure Not assigned Pressure check only High pressure switch does not close
48. ther you have selected loaded or unloaded pressures You must select loaded if your vehicle is carry ing any load Run Flat Key Caution Operating a loaded vehicle at unloaded tire pressures This key allows the operator to over ride the 11P tire leak imbalance may result in tire overheating and reduced tire life or blowout fault Check Tire Condition under Operator Controls in Section 3 This key also instructs the system to check tire pressures at more frequent intervals The RUN FLAT feature will automatically de select Run Flat Indicator after 10 minutes This asterisk matches the symbol on the Run Flat key and it indicates that the Run Flat feature is selected 11 12 Operator Instructions PLAT L Select Key This key allows the operator to continuously monitor one channel or scan all of them On power up the Operator Control Panel will not display any pressures Quiet Mode Pressing the select key once will cause the display to scan the tire pressures see Channel Indicators Repeated pressing will lock the display on each individual channel so that any channel may be monitored continuously and then return to the no display condition Note All symbols on the display will light momentarily upon start of the vehicle PTH fe af F a ES 4 MEM um E ia gel Configuration Indicators The tractor
49. tire pressure can be caused by a damaged tire plugged wheel valve filter or leaking air lines An air leak can be located either before or after the wheel valve 1 Possible Causes Severe tire damage or leaks Leaking lines Leaking seals Leaking wheel valve Crimped or restricted control lines The components located before the wheel valve that may cause a code 11P include e Leaking control lines e Restricted wheel valve exhaust port e Leaking wheel air seals Components located after the wheel valve that may cause a code 11P include e Damaged tire e Rim leaks e Leaking air lines e Wheel valve damage To correctly diagnose the faulty component connect the Diagnostic Tool see Section 5 for test equipment and descriptions and follow the procedure in the 11P troubleshooting tree See Troubleshooting Tips on page 20 for general guidelines on system diagnostics Troubleshooting Tree Code 1 1 Type Tire Leak Imbalance Using the diagnostic 220 identify the faulty channel steer drive or trailer Manually chack the tira pressures Check for a blocked wheel vatve exhaust or plugged wheel value fiter Make repairs ta faulty components and recheck the systern 10 Service Manual Make repairs to faulty com onants and recheck system fo Service Manual at the wheel valves on the faulty channel Are any wheel readi
50. trailer outline show s whether the vehicle is configured with a two channel tractor or straight truck or three channel tractor and trailer Tire Pressure Control System F r i E i 7 malam E Logomark Indicates power on at vehicle start up Larrt ee oid al ge i 0 09323 43 i Tre Pressures Control H 7 r1 i lt r BB 1 a ees o OO i e EE ee OSE etn pe i ee ee ee iy cb Channel Indicators The rings inside the tires of the configuration indicators show with channel steers drives or trailers is being reported by the digital display Operator Instructions Tire Pressure Control System Programming Spicer s Tire Pressure Control System features on location programming through the Operator Control Panel Programmable settings include e Individual pressure settings for the steer drive and trailer axles e Loaded and unloaded axle programming for highway off highway and emergency conditions e Overspeed warning for highway off highway or emergency conditions Enter the Tire Pressure Control System programming sequence by pressing the SELECT and L U buttons at the same time A flashing bar or psi verifies that you are in the programming mode and also indicates that the first selection English or Metric values
51. ure readings to the Electronic Control Unit The Pneumatic Control Unit delivers the proper control signal to the appropriate channel steer drive trailer Speed Sensor The speed sensor provides the Electronic Control Unit with vehicle speed information If the vehicle speed is above programmed limits the system will display an overspeed indication on the Operator Control Panel Continued operation in this condition will cause the system to automatically inflate the tires to a more appropriate pressure Pressure Switch The pressure switch acts as an electronic brake priority switch It prevents the Tire Pressure Control System from consuming air from the wet tank until the brake system is fully charged This prevents the Tire Pres sure Control System from allowing the primary and secondary tanks to go below recommended operating pressures for braking Air Lines Wiring The Tire Pressure Control System uses a dedicated pneumatic system All electric cables and connectors are supplied in an integrated harness plumbed from the vehicle s existing wet tank Operator Control Panel Pressure Switch Pneumatic Control Unit ji Electronic Control Unit Figure 1 Tire Pressure Control System Components Operation System Operation A vehicle equipped with the Tire Pressure Control System will seem to operate the same as a vehicle without the Tire Pressure Control System however there are some differences e During
52. witch off Disconnect harness at TO wany connector Repair or replace Measure solenoid coll resistance an 10 way connector harness Resistance shouid be 7 25 onms 120 FD 4100 H E FG Tic H B YES a 80 02 Are resistance Mess urements OK Repair or replace coils ar POU YES d Check for shorts between connector ping 8 C D G E and vehicle ground 31 1 3C Type Relay system Mode operation No Possible causes are listed in order of lik likely occurrence Code Description Code 13C indicates a relay problem Likely causes are either a blown VBATT fuse the relay itself or problems with the relay enable circuit After checking the VBATT fuse an easy second step is to swap a known good relay and see if the fault is cleared If the fuse the relay and the relay enable circuit all check out OK the likely cause of the problem is a faulty Electronic Control Unit ECU See Troubleshooting Tips on page 20 for general guidelines on system diagnostics 32 Condition Relay open Troubleshooting Control _ Possible Causes Blown VBAT fuss Faulty relay or socket Relay enable open Relay enable shorted to VBAT Faulty Electronic Gontrol Unit Relay shorted Relay enable shorted to
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