Instructor on the Desktop
Contents
1. Install the screws Then install the center trim panel explained above Install the gearshift lever Remove the protective plastic sheet and tape These are the highlights Be on the lookout for a bulletin to follow Thanks to lan Doran continued from page amp Replace Ignition Switch 1999 2000 Cadillac Escalade 1997 2001 Chevrolet and GMC C K and S T Models Oldsmobile Bravada with 4L60 E Automatic Transmission RPO M30 01 07 30 012 New Control Valve Body Spacer Plate and Gaskets for 4L60 E Automatic Transmission 1998 2001 Chevrolet Camaro Corvette Pontiac Firebird Chevrolet and GMIC C K M L S T and G Cadillac Escalade Oldsmobile Bravada with 4L60 E Automatic Transmission RPOs M30 and M32 01 07 30 013 replaces bulletin 87 71 76 Information on Automatic Transmission Performance During Cold Weather Operation 1999 2001 Chevrolet and GMC C K Models with 4 3L 4 8L 5 3L or 6 0L Gas Engine VINS W V T U RPOs L35 LR4 LM7 LO4 and 4L60 E or 4L80 E Automatic Transmission M30 MT1 01 07 30 014 4165 E Transmission Delayed Shifts Slips Flares or Extended Shifts During Cold Operation Replace Shift Solenoid Valve Assembly 2001 Buick Century LeSabre Park Avenue Regal Chevrolet Impala Lumina Monte Carlo Venture Oldsmobile Aurora Intrigue Silhouette Pontiac Aztek Bonneville Grand Prix Montana with 4T65 E Automatic Transmission RPOs MN3 MN7 M76 M15 01 07 30 0162. This is in fact the first STC course delivered via the web A e a AT The screen has a familiar look in common with previous STC CDs so you don t ieee ar Meee es have to learn from scratch i T CU r 10S A The SI 2000 course is intended for everyone in the service department It Cadillac Control Module Programming Adapter 5 guides the beginner in getting started with SI 2000 and helps the more experi a a ba ea A enced user to do more sophisticated searches And it s fairly intuitive so you a S don t have to be a computer whiz to use it sales aes A i Using colorful illustrations text and audio the course permits you to learn Replacing Oil Cooler Lines facts answer questions and try things out right on the screen Buzzing in Audio System i And all the while the invisible instructor on the desktop keeps track of AKE Unable to Program or Learn continued on page 2 oa ee ee ase wees ok 4 le F ee Trim nd Installatic cM Service Operations your progress corrects you when you make mistakes and offers remedial instruction when it s necessary Convenience The word that best sums up this kind of training is convenience You can take the training when and where it s conve nient to you either in the dealership or at home wherever an appropriately equipped computer is available See the GM STC Course Catalog for system requirements You are able to study the materi
3. Alero Pontiac Grand Am Sunfire 01 06 04 019 Water in AIR Pump and or DTC 48 Install AIR Pump Service Kit 1994 Buick Roadmaster Cadillac Fleetwood Chevrolet Caprice with 4 3L or 5 7L V8 Engine VINs W P RPOs L99 LT1 01 06 04 020 Service Engine Soon Indicator Lamp On DTC P1781 Set Reprogram Engine Control Module 2001 Chevrolet and GMC C K 2500 3500 Series Pickup Models with 8 1L RPO L18 Gas Engine and Allison Automatic Transmission RPO M74 01 06 04 021 PCV System Freeze Up Install New Outer Heat Shield Panel Replace Oil Indicator 1999 2001 Chevrolet and GMC W Series Medium Duty Tilt Cab Models with 4HE1 TC Diesel Engine 01 06 04 022 Inaccurate Erratic Fuel Level Gauge Readings Install New Sensor Strainer and or RH Fuel Sender Assembly 1997 2000 Chevrolet Corvette 01 06 04 023 Revised Fuel Gage Inaccurate or Inoperative Diagnostic Procedure 1999 Chevrolet Malibu 01 06 04 024 Revised DTC P0462 Fuel Level Sensor Circuit Low Voltage Diagnostic Procedure 1999 Chevrolet Camaro Pontiac Firebird with 3 8L Engine 01 06 04 025 Revised DTC P0462 Fuel Level Sensor Circuit Low Voltage Diagnostic Procedure 2000 Chevrolet Camaro and Pontiac Firebird with 3 8L Engine 01 06 04 027 Revised Fuel Gauge Inaccurate or Inoperative Diagnostic Procedure 1999 Chevrolet Cavalier and Pontiac Sunfire TRANSMISSION TRANSAXLE 99 07 30 020A replaces bulletin 99 07 30 020 Automatic Transmission Ser
4. Klear was first discovered by a GM dealership Since then it has been evaluated in the field and has been found effective in reducing or removing the odors of mold and mildew resulting trom water leaks It can be used to remove customer created odors such as those caused by smoking spilled food or pets Atmos Klear can also be used to reduce odors in the HVAC system The product can be safely used on fabric vinyl leather carpet and sound deaden er Perhaps the most important thing to know about Atmos Klear is that it reacts chemically with the source of the odor and neutralizes eliminates the odor It is not a cover up or odor mask Atmos Klear has no odor itself This sometimes leads people to think mistakenly that it s not working because they don t smell anything The second important fact to remem ber is that Atmos Klear must come into direct contact with the source of the odor Simply spraying it into the vehicle s interior will temporarily remove odor from the air but unless the source is contacted directly the odor may come back Third Atmos Klear is biodegradable non toxic non corrosive non staining non masking hypoallergenic colorless and odorless which minimizes concerns about using it This example demonstrates the effectiveness of the product True story A GM employe inadvertently left a pack age of raw chicken in a car for 2 weeks parked in the summer sunshine It became known as the ch
5. Oil Pump Drive Shaft Assembly Inspection 1999 2001 Chevrolet Cavalier Malibu Oldsmobile Alero Pontiac Grand Am Sunfire 1999 Oldsmobile Cutlass with 4T40 E 4T45 E Transaxle RPO MN4 BODY AND ACCESSORIES 00 08 46 004A replaces bulletin 00 08 46 004 Re establishing Communications with OnStar Center After Battery Disconnect various 2000 01 models with OnStar 01 08 43 002 Reduced Fluid Level in Windshield Washer Reservoir After Vehicle Operation Remove Reservoir Cap Gasket Install Check Valve 1990 2001 Chevrolet and GMC C6 7 Conventional Medium Duty Models 01 08 44 005 Information on Error Codes on Radio Display Their Cause and Corrective Action various vehicles 1995 2002 01 08 61 003 Information New Frame Insulator Remover Installer from Kent Moore various vehicles from 1997 2002 01 08 64 007 Door Rattle When Closing Install Insulator 2001 Chevrolet Tracker 01 08 97 001 New HomeLink Transceiver Garage Door Opener Transmitter Test Kit Available 2001 and Prior GM Passenger Cars and Trucks with HomeLink System RESTRAINTS 01 09 41 003 Procedure in Initialize the SIR System During Pre Delivery Inspection 2001 Chevrolet and GMC C K Pickup and Utility Models 2002 Cadillac Escalade Return to page 1 SuNletINS 2 355 This review of service bulletins released through mid May lists the bulletin number superseded bulletin number if applicable subject and models G
6. 1 248 816 3641 Production Manager Marie Meredith Desktop Publishing Greg Szpaichler MediaWurks lt spake mediawurks com FAX number 1 248 649 5465 Write to gt lt TechLink PO Box 500 Troy MI 48007 0500 GM TechLink on the Web _ http service gm com General Motors service tips are intended for use by professional tech nicians not a do it yourselfer They are written to inform those techni cians of conditions that may occur on some vehicles or to provide informa tion that could assist in the proper service of a vehicle Properly trained technicians have the equipment tools Safety instructions and know how to do a job properly and safely If a con dition is described do not assume that the bulletin applies to your vehi cle or that your vehicle will have that condition See a General Motors deal er servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information Inclusion in this publication is not nec essarily an endorsement of the indi vidual or the company Copyright 2001 General Motors Corporation All rights reserved Return to page 1 continued from page 2 go back to re learn something simply click on the module or lesson name in the Course Outline to go there When you take the test at the end of a module you need to answer all the questions correctly before you can advance to the next module An incor re
7. ENERAL INFORMATION 01 00 89 007 replaces bulletin 58 05 O4A Inspection Maintenance Labor Operations All 1989 95 Passenger Cars and Trucks HVAC 01 01 37 008 Passenger Side of Vehicle Colder Warmer than Driver s Side Repair HVAC Case to Cowl Seal 1999 2001 Chevrolet and GMC C K Pickup and Utility Models 2002 Cadillac Escalade STEERING 01 02 32 003 Release of New Power Steering Cooler Assembly 1996 2001 Chevrolet and GMC G Van School Bus Models with Brake Warning Indicator RPO J1 01 02 32 004 Guidelines for Use of Essential Tool J 44721 Power Steering System Analyzer 1997 2002 Passenger Cars and Light Duty Trucks with Power Steering 01 02 35 003 Deletion of Steering Column Wheel Locking Feature on Vehicles with Automatic Transmissions 2001 Chevrolet and GMC C K Pickup and Utility Models 2002 Cadillac Escalade SUSPENSION 01 03 10 002 Exceeded Tire Inflation Pressure Harsh Ride Factor 2001 Chevrolet and GMC C K 1500 Series Pickup and Utility Models 1500 Series G Van Models DRIVELINE AXLE 99 04 21 003B replaces bulletin 99 04 21 003A Front Wheels Slipping with Vehicle in Four Wheel Drive Replace Transfer Case Clutch Plates and Front Drive Axle Lubricant 1999 2001 Chevrolet and GMC K and T Models with NV236 246 Transfer Case RPO NP8 01 04 19 003 Harsh Clunk Noise from Front Axle while in 4WD and During Turning Maneuvers Replace Front Differential Case Actuator and Side Bear
8. PCM the following modules need to be programmed after replacement using the Service Programming System SPS and the Tech 2 Liftgate Module LGM Instrument Panel Cluster IPC Active Transfer Case ATC Passenger Door Module PDM Driver Door Module DDM Many 2002 Trailblazers Bravadas and Envoys are supported in TIS 2000 soft ware version 5 0 If the vehicle you are reprogramming is not supported call Techline Customer Support at 1 888 337 1010 prompt 6 to get a VCI number When programming the instrument cluster there are two different calibra tion choices Replacement instrument clusters with hardware part numbers similar to 1506XXXX must receive 1508040X calibrations and clusters with hardware part numbers similar to 1508XXXX must receive 150854XX cali brations The 8 digit part number of the cluster being replaced can be found in the Module Information menu on the Tech 2 Choosing calibrations based on IPC hardware number will be available with the TIS2000 version 7 toward the end of July If the incorrect calibration is used the fuel gage will display the incorrect fuel level A bulletin is also being issued to explain the procedure to follow for these modules when they are replaced Thanks to Jamie Clough L Console Trim Removal and Installation On the 2001 Oldsmobile Aurora it s necessary to remove the wood trim plates to service components inside the console Here are some ser
9. adings Needle fluctuates or drops between 1 and 2 inches Hg at idle Possible Cause Burned or leaking valve or spark plug in one of the cylin ders is not firing Readings Irregular needle drop between 1 and 2 inches Hg Possible Cause Sticking valve intermittent spark plug misfire or rich or lean air fuel mixture Readings Normal at idle speed but excessive vibrations at higher rpm Possible Cause Weak valve springs valves sticking in guides Readings Excessive vibrations at idle speed but steadies at higher rpm Possible Cause Worn valve guides Readings Excessive vibrations at all rpm Possible Cause Leaky head gasket Readings Needle oscillates slowly or drifts between 3 and 9 inches Hg lower than normal Possible Cause Intake system leak Readings Normal at idle speed but drops to near zero and rises to lower than normal Possible Cause Restriction in exhaust system Return to page 1 Up to the Minute Cadillac Control Module Stand Alone Programming Adapter The J 45411 programming adapter is shipping to Cadillac dealers in June It Is necessary to isolate the PCM from the controller network and minimize the chances of interruptions when program ming with your Tech 2 See the January 2001 TechLink for details Complete instructions are attached to the tool Thanks to Dave Roland LJ Rear Brake Rotor Removal On some 1999 2001 S T vehicles you may h
10. al at your own pace and if you need to take a break or interrupt the training for any reason no problem Just use the built in bookmark feature to return to the place you left off Your bookmarks are stored on the STC server so you can start the course at the dealership and resume it later at home without losing your place When you finda this module you rill be abie io Taplaia the procedares for lanarhing a Launch beth the Basic ond Enhanced vertions of Each Module Has Objectives Taking the Course Because the course builds on what you ve already learned you need to take the course in menu order You can always go back to things you ve already studied but you cannot jump forward Using a combination of keyboard inputs and mouse clicks you are permit ted to interact with the simulations in the course The material is designed to be intuitive and easy to use and there s a narrator s voice to guide you throughout Module 1 Objectives continued from page 7 the course At the end of each module you will be asked questions to validate what you ve learned And at the end of the entire course there s a final exam to be sure you ve learned all of the material You need to get all the answers right to pass When you re done with the final exam your records will be automatically uploaded to your individual record in the Training Management System TMS Here the information will be reflected in y
11. ally those relating to lack of power or rough running a baseline vacuum check is a useful piece of information Good sources of manifold vacuum are sometimes hard to find these days Because baseline vacuum checks are done in the service bay and the vehicle is not driven for temporary testing pur poses the most common location of a good manifold vacuum source is the vac uum line to the brake booster Vacuum at Idle The test should begin with a idle vacuum quality check The needle should be typically 16 20 in Hg inches of mercury and steady Because some older engine families have a lower value normally be sure to reference against a known good vehicle with the same engine High altitude locations also may have slightly lower vacuum readings Vacuum gauge needle fluctuation at idle can indicate internal engine prob lems specifically problems with the valves valve springs cam lifters and pushrods or even heavily compromised cylinder mechanical integrity Low but steady vacuum readings can indicate camshaft drive mechanism or ignition timing related issues as well as intake manifold leaks Vacuum at Elevated RPM After checking idle vacuum snap the throttle to wide open and settle the engine speed back to about 2500 RPM During this the vacuum should initially fall to a very low level not zero at the initial throttle snap and then regain a level at or somewhat above the idle reading If it does not recover
12. ave difficulty removing the rear brake rotors There are two causes First an unsupported rear axle can cause this condition by stretching the cable and slightly applying the parking brake In this case support the rear axle Second a rust ridge on the back of the rotor parking brake drum surface or grooves in the shoes drum surface may cause interference If this is the case remove the tire Drive one of the five wheel retention studs out the back of the rotor Rotate the rotor to align the stud hole with the parking brake adjuster Use a screwdriver to back off the parking brake shoes Thanks to Dan Oden LJ Exhaust Rattle Noise Before replacing exhaust system components for a rattling noise on 1998 2001 Chevrolet Blazer and GMC Jimmy and Envoy check the roof rack cross bar knobs for tightness A loose roof rack knob can vibrate and produce a rattle that seems to come from the exhaust system Thanks to Dan Oden Brake Pad Orientation 1997 1999 Oldsmobile Cutlass 1997 2001 Chevrolet Malibu 1999 2001 Oldsmobile Alero and Pontiac Grand Am When installing front brake pads on the above vehicles the pad with the wear indicator must be installed in the Inner pad foreground with wear indicator inboard position against the piston in the brake caliper When properly installed the wear indicator will point upward with the caliper installed on the car If the pad with wear indicator is
13. ct answer results in remediation the program takes you back to study the related content a second time And note that when the question is asked again the order of the answers is randomized evaluation at the end of the course There s even a free text area for com ments Your opinions will help STC improve web based training in the future Getting the Most Out of the Course It s estimated that you ll need about 2 to 3 hours total time to take the course depending on your own reading and learning speed and the speed of your internet connection If you d like permanent reference material locate the Techline CD sent to your dealership entitled S 2000 User s Guide v 2 0 TIS 2000 User s Guide v 1 0 There are provisions on the CD to print out the manual in paper form if you wish Thanks to Chris Wallace TIP Download times may be quicker during internet off times Your local conditions may vary You are encouraged to fill out the Blank Display on Driver Information Center Some 2001 Pontiac Aztek models equipped with the Driver Information Center DIC may exhibit a condition of a blank information page for the Fuel Used display The initial DIC message is the compass and outside temperature Using the Mode button it is possible to toggle through eight other displays including Fuel Used If you encounter a blank page where Fuel Used should appear press and hold the Set button until the info
14. d to measure fuel pressure from engine mounted mechani cal fuel pumps to adjust carburetor idle circuits and to measure engine vacuum Engine vacuum was the driveability tech nician s first indicator of an engine s state of health in the days before fuel injection Today combination vacuum pressure gauges are no longer popular as they are not as universally useful For exam ple you cannot measure fuel pressure on today s vehicles with them and you no longer have any idle circuits to adjust This article will feature the nearly lost art of baseline engine diagnosis using a vac uum pressure gauge A Look at Engine Vacuum So where does engine vacuum come from Engine vacuum is generat ed by the pistons moving down in the cylinders during the intake stroke draw ing air past the throttle plate and through the intake manifold An engine s ability to generate vacuum is directly propor tional to its ability to make compression in the cylinders Vacuum is highest during vehicle deceleration when engine speeds are high and the throttle plate is closed Conversely low vacuum is achieved at wide open throttle when atmospheric pressure rushes into the intake manifold Vacuum as a Diagnostic Aid Although definitive results are rarely discerned from a vacuum gauge reading general engine mechanical health and diagnostic clues can be realized by a simple engine vacuum check For some driveability related concerns especi
15. e pin D1 interior lamp output Install one filter to circuit 40 orange wire at BCM C2 pin E cour tesy lamp feed Try the filter in both directions to determine the best result Be sure to ground the filter Affected models 1999 Cadillac Escalade K1 1999 GMC Denali K1 2000 Cadillac Escalade K1 2000 GMC Denali K1 GM Technical Assistance LJ RKE Unable to Program or Learn On some 1999 2001 Chevrolet and GMC trucks the Remote Keyless Entry system will not program The learn mode can be accessed but the RFA will not learn the key fob The key fobs may not be compatible with the Remote Function Acutator mod ule In model year 2001 two different generations of RFA modules are used Verify the part used on the vehicle The key fob must match the RFA There is no visual difference in the key fobs The RFAs have a different color lid Two part numbers are used in model year 2001 1999 2001 15732806 Remote Function Actuator first design with black lid uses key fob 15732803 2001 2002 15042969 Remote Function Actuator second design with grey lid uses key fob 15042968 GM Technical Assistance Return to page 1 Product Advisory Atmos Klear Heavy Duty Odor Eliminator In November 2000 you received a copy of GM Bulletin 00 00 89 027 which contains information about using Atmos Klear to eliminate unwanted odors in vehicles Here s a bit more information on the subject Atmos
16. ee oe oe oe ele le le ole oe oe ee le le le ole ole le Po eee a a a a a Mo ote uia aia at EEE r ie _ at June 2001 Ey ji is F Volume 3 No 6 Publication for GM Dealership Service Professionals Sleep Mode Feature Added to Tech 2 Course Main Menu 1 Getting Started 2 General Maeigation 3 Viewing amp Painting Schematics 4 Advanced Navigation T Damay Dema Teri In June a new feature is being added to the Tech 2 to assist you in diagnosing low battery conditions If a control module wakes up after vehicle shutdown the resulting drain could put a strain on the battery s reserve The Sleep Mode feature will tell you which module is waking up and when it s doing It continued on page 3 i En a ly i m am CTO Th To ta e ICI n OIIO bd KLOR B Service Information 2000 SI 2000 your electronic service manual tool on the internet and CD has been up and running for the past several years In that time you ve no doubt learned how to use some of its features But are you as ontents skillful with it as you used to be with paper manuals Didn t think so To help you get the most out of SI 2000 the GM Service Technical College aoa ede led to Tech 2 has produced a new web based SI 2000 training course That s right You ll use Blank Disnlav on D the internet to learn how to use your internet based service manual What could ma make more sense
17. icken car the stench was unbearable But when applied according to instructions Atmos Klear removed all traces of the odor When treating the musty odors of mold and mildew caused by a water leak you must first locate the source of the odor This may require removal of carpeting sound deadening and the like Then spray Atmos Klear directly onto the source To prevent a recurrence you must also locate and eliminate the cause of the leak There is no practical way to treat the jute backing used on some carpeting but in the case of rubber backing you can add Atmos Klear to your steam cleaner or extraction unit to treat the odors Although Atmos Klear can be applied directly from the provided spray bottle there are certain applications in which the effectiveness of the product is enhanced by adding some liquid soap and water The instructions explain when and how to do this Atmos Klear is manufactured by Twin Star Industries 1 800 977 4145 and is distributed to GM by Ecolab Vehicle Care Division To order or for technical ques tions please call 1 877 855 0670 Atmos Klear is available in case lots starter kits of 32 oz spray bottles 6 per case and 1 gallon refills 4 per case You may also obtain more informa tion at the website www atmosklear com Thanks to Alan Srodawa E Module Reprogramming For the 2002 Chevy TrailBlazer GMC Envoy and Oldsmobile Bravada in addi tion to the BCM and
18. ings 1999 Chevrolet Tracker with Four Wheel Drive BRAKES 01 05 22 002 Incomplete Brake Pedal Return Replace Vacuum Brake Booster 2001 Chevrolet Corvette 01 05 23 005 replaces bulletin 73 50 34 Proper Installation of Front Brake Pads with Wear Indicator Possibility of Reversing Front Brake Pads 1997 2001 Chevrolet Malibu 1997 1999 Oldsmobile Cutlass 1999 2001 Oldsmobile Alero and Pontiac Grand Am 01 05 25 004 Yellow Traction Control Handling Lamp On and Driver s Info Center Displays Service Active Hndlg Repair Reprogram ABS Module 2001 Chevrolet Corvette 01 05 26 001 Low Effort Parking Brake Apply System 1999 2001 Chevrolet and GMC C K 15 and 25 Series Pickup 2000 2001 Chevrolet and GMC 15 and 25 Series Utility ENGINE PROPULSION SYSTEM 99 06 03 007C replaces bulletin 99 06 03 007B Fuel Gauge Inaccurate Fluctuates Premature Low Fuel Chime Exchange Instrument Panel Cluster Replace Level Sensor Reprogram EEPROM 1997 99 Buick Century Regal Chevrolet Lumina Monte Carlo Pontiac Grand Prix 1998 99 Oldsmobile Intrigue 99 06 04 005A replaces bulletin 99 06 04 005 Driveability Symptoms Due to Clogged Fuel Injectors Clean Injectors various vehicles with 3 1L or 3 4L V 6 engine VINs E J M RPOs LA1 LG8 L82 01 06 04 007A replaces bulletin 01 06 04 007 MIL Indicator Illuminated DTC Code P0442 Stored Replace Fuel Sender to Tank O ring 2000 01 Chevrolet Cavalier Oldsmobile
19. installed in the outboard position in the caliper interference between the spare wheel and the brake caliper may occur when the spare tire is installed and pre mature front brake lining wear may result The service manual text and or illus tration for front brake pad installation for these vehicles may not make this point clear Thanks to Darryl Butler E Replacing Oil Cooler Lines Affected vehicles S10 Sonoma Jimmy Blazer and Bravada Redesigned engine oil cooler lines P N 15760333 and 15760334 replace the old parts on 4WD utility and pickup trucks and P N 15757070 replaces the lines on 2WD vehicles Installation on 1996 T pickup and utility vehicles require that the lip of the rubber baffle attached to the radiator support be trimmed to fit A grille redesign eliminated the baffle in 1998 models New seals come with the new lines However technicians must order and install new clips to hold the lines into the connector at the radiator New clips are available in a bag of ten under P N 15724727 Thanks to Dan Oden TAC Buzzing in Audio System On some Denali and Escalade mod els the radio may buzz when the theater dimming feature of the courtesy lamps is functioning This is caused by EMI from the BCM circuits 157 and 40 Add filter 1224205 to BCM connec tors C1 and C2 Refer to document 337908 in SI 2000 for correct pin loca tions Install one filter to circuit 157 gray wire at BCM C1 blu
20. o cable adjustment provision on these vehicles Thanks to Mark Ludescher Driver s Seatback Movement When Braking A recent bulletin 00 08 50 014 addresses a seatback condition on 2000 Chevrolet and GMC C K Pickup Silverado and Sierra and Utility Suburban Tahoe Yukon Yukon XL Models The procedure in the bulletin is applicable to the power recliner only GM Technical Assistance continued from page 7 With the ignition off connect the Tech 2 enter Diagnostics and build the vehicle Under Diagnostic Circuit Check select Class 2 Message Monitor This is the same screen where you ll find the Ping feature explained in the February TechLink Select the Sleep Mode soft key This clears all modules from the display list resets the timer and monitors for the presence of a module If active mod ule s is are detected they are displayed in the order of response and the timer stops updating and displays the time h m s when the bus first became active Thanks to Jerome Burton Return to page 1 Diagnostic Interpreting Vacuum Gauge Readings NOTE Current diagnostic proce dures will isolate all problems and these procedures are intended only to provide further root cause detail Not many years ago when the car buretor was common and fuel injection was not there was a vacuum pressure combination gauge in nearly every tool box This inexpensive yet practical tool was commonly use
21. our permanent training record For now the SI 2000 course is not required but will be a part of the 2002 Dealer Service Training Standards You can take it now and your score will be recorded and will count toward fulfill ment of the 2002 Training Standards Controls and Features The screen header contains tabs for Main Menu Course Outline Glossary Help and Exit These tabs are active at most times to provide methods of moving quickly in the course to another area The Glossary provides defini tions of many of the words used in the course Once you ve begun the course you will notice Next Back and Replay buttons in the upper left of the SI 2000 course not the browser you are working in These buttons allow you to navigate within the section you re currently work ing on As you work your way through the course you can use the Course Outline to check your progress The name of each module becomes underlined when you ve completed it And if you want to Tabs for Controls GM TechLink is a monthly magazine for all GM retail technicians and Service consultants providing timely information to help increase knowl edge about GM products and improve the performance of the Service department This magazine is a companion to the GM Edge publication Publisher amp Editor Mark Stesney GM Service Operations lt Mark Stesney GM com Technical Editor Jim Horner lt Jim Horner SandyCorp com
22. rmation appears Once the information has been restored it will continue to display the information as intended Currently the Fuel Used display will go blank when the cumulative gallons used attempts to roll over from 99 9 gallons A software change is being evaluated as a field correction Thanks to Tom Russell G Sunroof Panel Sticks On some 2001 Pontiac Grand Prix models built between July 2000 and February 2001 the sunroof glass panel may stick when opened or may not close all the way down without slight hand pressure to the glass panel Inspect the track mechanism and or adjustment of the glass If the panel still sticks try replacing the glass weather strip Some weatherstrips were manu factured with an oversized cross section in the bulb area which can cause the sunroof glass to stick in the roof open ing Thanks to Fred Tebbets Full Size Light Duty Truck Park Brake Effort All 15 and 25 series pickups and utility vehicles 1999 2001 have a very low effort park brake apply pedal that allows any driver the ability to apply the park brake and hold the vehicle on a 30 grade Due to the low effort some customers may think the brakes are not operating correctly If the truck will hold on a 30 grade after the park brake is applied then no adjustment is neces sary If adjustment is needed apply and release the park brake pedal 3 times be sure parking brake shoe clearance is set to specs There is n
23. sole Remove the gearshift lever by pulling it off there are no fasteners The console trim plate is retained to the instrument panel with 2 screws and to the console with 5 clips Remove the 2 screws first Then Console Trim Plate insert the trim tool under the rear edge of the console trim and pry upward to dis engage the two rearmost clips TIP Insert the plastic trim tool far enough under the trim to engage the plastic substrate do not pry on the edge of the wood veneer When loosening the console plate along the full length carefully press the console sides away from the wood Slowly and carefully work up each side When the trim plate is clear of the soft vinyl disconnect the electrical connectors and slide the trim plate rearward to dis engage the front portion from the instru ment panel Before installing the trim piece be sure the protective tape is still in place TIP Obtain some scrap plastic seat Console Trim Plate viewed from below to show proper prying technique protective sheet removed during new vehicle prep and lap it over the sides of the console as added protection Hook up the electrical wiring Slide the ash tray end of the console trim into the instrument panel using care not to damage the vinyl trim on each side Then align the clips and press down to engage the clips while easing the trim between the vinyl edges of the console Press the rear clips into place Do not pound
24. vacuum fully at or above the vacuum level at idle an exhaust restriction may be suspect ed Excessive vacuum can indicate an intake airflow restriction such as a very dirty or restricted air filter Finally allow the throttle to snap closed and engine speed to return to idle The high engine speed and closed throttle plate should create a high vacuum until normal idle speed is reached Some technicians believe that with the advent of electronic sensors using a vacuum gauge to check intake manifold vacuum level is not necessary because vehicles are equipped with a Manifold Absolute Pressure MAP sensor While it is true that a MAP sensor allows you to discern the vacuum level in the intake manifold reading the MAP sensor value with a scan tool does not allow you to observe the quick fluctuations in the vac uum level like a mechanical gauge can In the next article we ll look at MAP sensors including a unique method of oscilloscope testing to chart fluctuations in a MAP sensor signal In the mean time explore some known good engines and learn the art of vacuum testing Thanks to Craig Blake Readings Average steady readings between 15 22 inches Hg nor mal readings for a 60 V6 engine may be lower i e 12 16 inches Hg Possible Cause Normal Readings Low but steady between 12 and 15 inches Hg Possible Cause Leakage around piston rings late ignition timing or late valve timing Re
25. vice Procedure Changes 2002 and Prior Passenger Cars and Light Duty Trucks with Automatic Transmission 99 07 30 030A replaces bulletin 99 07 30 030 Grinding and or Growling Noise in Park on Incline various 1992 2001 models with Hydra Matic 3T30 RPO MD9 4T60 RPO MEQ 4T60 E RPO M13 or 4T65 E RPO MN3 MN7 M15 and M76 00 07 30 017A replaces bulletin 00 07 30 017 Allison Automatic Series 1000 Transmission Exchange Program Early Concern Detection 2001 Chevrolet and GMC C K 2500 3500 Series Pickup Models with Allison Automatic Series 1000 Transmission RPO M74 01 07 29 002 High Shift Effort on Manual Transmission Replace Gearshift Control Change Lever Assembly and Shift Cables 1997 2001 Chevrolet and GMC F Model T series Medium Duty Tilt Cab 2000 2001 Chevrolet and GMC WT 5500 Series Medium Duty Tilt Cab with MND6O Isuzu Manual Transmission RPO M54 01 07 29 003 Transmission Jumps out of 3rd Gear Replace 3 4 Shift Fork 3 4 Synchronizer Assembly 3rd Gear Blocker Ring and 3rd Speed Gear 1999 2000 Chevrolet and Pontiac Firebird with Manual Transmission RPO MM6 01 07 30 002A replaces bulletin 01 07 30 002 Malfunction Indicator Lamp MIL On Transmission Stuck in Third Gear Instrument Cluster Inoperative continued on page 7 Return to page 1
26. vice tips to help avoid damaging the trim plates or the surrounding instrument panel or console during removal and installation Preliminary Precautions Before removing either trim plate protect the edges of the vinyl trim with strips of tape To pry the trim loose use a plastic trim tool and insert a piece of card stock between the panels to provide a safe prying surface Do not use a screwdriver as a pry ing tool Insert the plastic trim tool far enough under the trim to engage the plastic substrate do not pry on the wood veneer Center Trim Plate Install protective tape as instructed above Then install tape or card stock to the upper edge of the console trim plate The center trim plate is retained to the instrument panel with 7 clips TIP Begin prying at the upper right 2 00 o clock position and work clockwise Last use both hands to support the substrate before pulling out the upper left clip Before installing the trim plate Return to page 1 Start Prying L H Last Use Both Hands to Remove Center Trim Plate ensure that the protective tape is still in place Align the clips into the openings Be sure to guide the trim plate past the edges of the vinyl trim Apply even pres sure to engage the clips Do not pound Console Trim Plate The center trim plate must be removed first explained above Then be sure protective tape is installed to the edges of the con
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