Chapter 10 Isuzu - Snap-on
Contents
1. VEHICLE YEAR CONNECTOR LOCATION Amigo 1990 94 1 Impulse 1990 92 1 Pickup 1990 95 1 Rodeo 1990 95 1 Stylus 1990 93 1 P To read ABS codes from 2003 04 Ascender e Connect the OBD II adapter to the 16 pin connector Figure 10 20 Figure 10 20 2003 04 Ascender ABS connector A 16 pin DLC B OBD Il adapter 107 Testing Antilock Brake System ABS 10 2 2 Manual Code Reading ABS There are 3 types of manual ABS codes for Isuzu vehicles e Rear wheel antilock RWAL see Figure 10 22 and Table 10 5 on page 108 e Type 02 see Figure 10 24 and Table 10 6 on page 109 e Type 05a see Figure 10 26 and Table 10 7 on page 110 RWAL ABS Code Type The RWAL diagnostic connector location is shown in Figure 10 21 Di Wy Ts ki oe a Figure 10 21 1991 95 Rodeo 1990 95 Pickup and 1992 94 Amigo1 pin RWAL diagnostic connector A RWAL 1 pin connector Straight Count Flashes the lamp or LED the number of times equal to the trouble code with a noticeable pause between multiple codes The first flash may be long or short depending on when diagnostics were entered Include long or short first flash as part of count For example a long first flash and seven equal flashes or eight equal flashes is code 8 0 2 Sec i rd 0 2 i 1 1 4Sec ty Seci J I 1 I I E a a 1 1 l I I l l 1 l 1 2 I I 3 l Code 3 Code Repeats Figure 10 22 suzu RWAL ABS Code2. Figure 10 36 2003 04 Isuzu Ascender 16pin DLC Connector for all systems A 16 pin DLC B OBD II adapter 117 Chapter 10 Isuzu 10 o Testing Transfer Case and Body Control Module BCM 118
3. 1 Connect the SCS service connector to the 2 pin service connector located under the glove box See Figure 10 23 on page 109 Depress the brake pedal Turn the ignition switch On while keeping the brake depressed After the indicator comes on depress the brake pedal again After the indicator goes off release the brake pedal again After a few second the ABS indicator blinks twice and the DTC is erased If the indicator does not blink twice repeat steps 1 through 6 if the indicator stays on after the indicator blinks twice check the DTC because a problem was detected during the initial diagnosis before shifting to DTC erasure mode 7 Turn the ignition switch off and remove the SCS service connector oar wnN ABS Indicator OFF Depressed semen p mm Brake Pedal Released Lanne T E Ignition Switch ON Figure 10 27 1996 99 Isuzu Oasis ABS DTC erasure mode 10 3 Testing Supplemental Restraint Systems SRS Isuzu SRS or airbag testing includes e Manual Code Reading SRS on page 112 e Clearing SRS Codes on page 115 111 Testing Supplemental Restraint Systems SRS 10 3 1 Manual Code Reading SRS Isuzu models use 2 types of SRS codes e Type 02a see Figure 10 29 Figure 10 30 and Figure 10 31 and Table 10 8 on page 113 e Type 03 see Figure 10 32 Figure 10 33 and Figure 10 34 and Table 10 9 on page 115 Code Type 02a Long Short Flashes a 2 digit t
4. connector several times while monitoring the SRS indicator flashes Start codes by Clear codes by Switch the ignition off and wait two to three seconds Turn the ignition switch on again The SRS indicator light should come on and go out after about six seconds Continue to monitor the SRS indicator and confirm that it does not come on again for another 30 seconds Turn ignition switch off Turn the ignition switch on The SRS indicator light comes on for about six to thirty seconds and goes off Shortly after the time depends on which DTC is confirmed by the self diagnosis system it will indicate the DTC e Incase of continuous failure s the DTC s will be indicated repeatedly see Figure 10 29 e Incase of intermittent failure s the SRS indicator light will indicate each of the DTC s one time then it will stay on see Figure 10 30 e Incase of both continuous and intermittent failures the DTC of the continuous failure only will be indicated repeatedly After troubleshooting it first recheck to make sure that the problem has disappeared and that there are no other codes Then erase the codes from memory e Incase the system is normal no DTC the SRS indicator light will start to blink see Figure 10 31 When done 113 114 Testing Supplemental Restraint Systems SRS Code Type 03 Tens Ones Flashes a 2 digit trouble code with a noticeable pause between each digit The first set o
5. Isuzu This chapter contains information for testing Isuzu vehicles with the Asian Import Vehicle Communication Software VCS The following Isuzu systems may be available for testing Engine Transmission Antilock Brake System ABS Supplemental Restraint System SRS Transfer Case Body Control Module BCM 10 1 Testing Engine and Transmission Systems Isuzu engine and transmission system testing includes Engine And Transmission Code Reading Connectors and Locations on page 97 Manual Code reading Engine on page 103 Hard Codes and Soft Codes on page 104 Clearing Codes on page 104 Road Test No C amp D on page 105 Field Service Functional Tests on page 105 10 1 1 Engine And Transmission Code Reading Connectors and Locations Figure 10 1 and Table 10 1 on page 98 show common engine diagnostic connector locations for Isuzu vehicles Figure 10 2 and Table 10 2 on page 99 show common transmission diagnostic connector locations The following engine and transmission code reading procedures are included To read codes from 1986 87 Trooper on page 99 To read codes from 1984 95 Pickup 1988 95 Amigo and 1991 95 Rodeo on page 101 To read codes from vehicles with a 12 pin connector on page 102 To read codes from 1988 89 Impulse on page 102 To read codes from 1985 89 I Mark and 1990 and later Impulse on page 103 To read codes from 1988 89 Impulse optio
6. Main code sub code Read codes on ABS indicator lamp With ignition switch off connect SCS service connector OEM 07PAZ 0010100 or jumper wire to 2 pin ABS service connector Turn ignition switch on without the brake pedal depressed Depressing brake pedal will initiate DTC erasure mode Start codes by Follow the procedure in the Clearing ABS Codes section of this manual Procedure includes connecting the SCS service connector or jumper wire to the 2 pin ABS service check connector pressing amp releasing the brake pedal several times while monitoring the ABS indicator lamp Clear codes by When done Turn the ignition off and disconnect the SCS service connector or jumper wire 109 110 Testing Antilock Brake System ABS Code Type 05a To read ABS codes from 2002 04 Axiom 1996 2002 Trooper 1999 2001 Rodeo and 1999 2001 Vehicross e Jump pins 4 and 12 as shown in Figure 10 25 12 3 i 12 5 1 lt gt lt gt lt gt 1Code 12 1 Code23 1 1 Code 13 1 I Code 25 I repeats i repeats i i repeats i i repeats i 13 times 3 times 3 times i 3 times i t Current Codes History Codes gt gt Figure 10 26 suzu ABS CodeType 05a Table 10 7 Isuzu ABS Code Type 05a Pattern 10s and 1s Read codes on ABS warning lamp Start codes by After bringing the vehicle to a complete stop and making sure the brake
7. Type Table 10 5 suzu RWAL ABS Code Type Pattern Straight Count Read codes on Rr Antilock or ABS indicator lamp With ignition switch on and indicator illuminated jumper ABS diagnostic Start codes by connector terminal to ground First flash may be long or short Include the long or short first flash as part of code number count Figure 10 21 Clear codes by Codes are cleared every time the ignition key is turned off When done Disconnect jumper amp turn ignition off Only the first fault that occurred during the current ignition cycle will set a code Vehicle may need to be driven to cause some codes to set amp turn on the indicator 108 Code Type 02 The diagnostic connector and warning lamp locations are shown in Figure 10 23 Long Short Indicator flashes a 2 digit trouble code with the 10s digit pulses staying on longer than the 1s digit pulses For example LONG LONG pause SHORT SHORT SHORT is code 23 Service Check Connector 2 Pin S eS ogogo ABS Indicator SCS Service Connector 07PAZ 0010100 Figure 10 23 1996 1999 Isuzu Oasis ABS service check connector location 2 0 Sec 1 3 Sec 0 5 Sec I I 1 1 0 3 Sec 0 4 Sec 0 4 Sec Jig oe Li I I LI Li HE Ignition i i Switch C i On First Cycle 7 Second Cycle I I I I Figure 10 24 Isuzu ABS Code Type 02 Table 10 6 suzu ABS Code Type 02 Pattern Long Short
8. connector C MULTI 1 adapter Diagnostic connector locations for the 1988 91 Trooper are shown in Figure 10 5 Figure 10 5 1988 91 Trooper connectors A ALDL connector B Distributor set timing connector C ECM D Diagnostic lead terminal Diagnostic connector locations for the 1984 95 Pickup 1988 95 Amigo and 1991 95 Rodeo are shown in Figure 10 6 on page 101 100 Figure 10 6 1984 95 Pickup 1988 95 Amigo and 1991 95 Rodeo connectors A 1984 87 Impulse leads and ALDL not shown B RWAL 1 pin connector C ALDL 3 pin connector D Timing set connector E Diagnostic leads connect together for flash codes P To read codes from 1984 95 Pickup 1988 95 Amigo and 1991 95 Rodeo e Connectthe MULTI 1 adapter with the white terminal converters Figure 10 7 and Figure 10 8 Diagnostic Connector Green White Black Figure 10 7 1984 95 Pickup 1988 95 Amigo and 1991 95 Rodeo connector and adapter Figure 10 8 1988 91 Trooper with automatic transmission connector location A Hood release B ECM C Diagnostic connector D MULTI 1 adapter 101 Testing Engine and Transmission Systems P To read codes from vehicles with a 12 pin connector e Connectthe MULTI 1 adapter to the connector Figure 10 9 or use the GM 1 adapter Figure 10 9 12 pin connector and adapters A Diagnostic connector B MULTI 1 adapter C GM 1 adapter D Green E White F Black P T
9. d codes on CHECK ENGINE lamp Connect two diagnostic connector terminals or jumper two terminals in a Start codes by connector and turn the ignition on When done Turn the ignition off disconnect the connectors and clear codes Code 12 always appears first Each code repeats three times including code 12 Code display cycle repeats as long as system is in diagnostic state 10 1 3 Hard Codes and Soft Codes Some models separate hard codes from soft historical codes Figure 10 15 RPM_1234 02 mV 689 MC DWL _ 38 DIAGNOSTIC MODE DO NOT DRIVE 13 02 SENSOR NOT WARM ENOUGH HC HISTORICAL CODES FOLLOW Figure 10 15 Data display with historical codes 10 1 4 Clearing Codes Some 1987 and later models allow clearing trouble codes from the Exit menu Figure 10 16 104 RESUME LED MENU PRINT SCREEN gt CLEAR ECM CODES PRINT FRAME FIX LINE 2 ARM MOVIE Figure 10 16 CLEAR ECM CODES If the code clearing operation fails for any reason the previous codes will reappear at the top of the data list when you return to CODES amp DATA If this happens repeat code clearing 10 1 5 Road Test No C amp D Many Isuzu models offer a ROAD TEST NO C amp D mode This option removes the scan tool resistive load applied to the vehicle ECM in CODES amp DATA so you can safely drive the vehicle with the scan tool connected NOTE No codes or data are transmitted when operating in this mo
10. de Some Isuzu vehicles particularly with carbureted engines provide a ROAD TEST mode of ECM operation but do not transmit data For these vehicles a ROAD TEST NO C amp D selection is available Figure 10 17 MAIN MENU ISUZU PRESS N FOR HELP gt CODES amp DATA ROAD TEST NO C amp D CUSTOM SETUP REVIEW MOVIE FUNCTIONAL TESTS TROUBLESHOOTER Figure 10 17 ROAD TEST NO C amp D selection 10 1 6 Field Service Functional Tests NOTE i Operations described in this section are not available on all tool platforms The Field Service functional test is available for some 198012 95 Isuzu models with General Motors control systems Selecting FIELD SERVICE displays a screen like Figure 10 18 FIELD SERVICE ALDL PINS 1 amp B SHORTED WITH KEY ON ENGINE OFF CE LAMP FLASHES TROUBLE CODES AND SOME ECM OUTPUTS ARE EXERCISED PRESS N TO EXIT Figure 10 18 Sample Field Service 105 Testing Antilock Brake System ABS IMPORTANT Do not enter Field Service mode while driving a vehicle on a road test ECM changes to ignition timing fuel delivery and other engine functions may affect engine operation and vehicle control In Field Service mode the scan tool grounds the diagnostic pin B in the ALDL connector The ECM does not transmit data in this mode and new trouble codes cannot be set On some models FIELD SERVICE can be selected to check or adjust ignition timing or the idle minimum air rate With the key o
11. de of dash A MES Memory Erase Signal connector B SCS service connector 115 116 Testing Supplemental Restraint Systems SRS To clear SRS Codes on 1996 99 Isuzu Oasis models 1 Switch the ignition off and disconnect the SCS connector from the service check connector Connect the SCS service connector part number 07PAZ 0010100 to the yellow 2 pin MES Memory Erase Signal connector A common jumper wire can be used as long as you maintain good contact between the terminals Switch the ignition on The SRS indicator lamp lights and stays on for about 6 seconds and then goes off Within 4 seconds of the lamp switching off remove the SCS service connector from the MES connector When the SRS indicator lamp lights again connect the SCS service connector to the MES connector within 4 seconds of the lamp switching on When the SRS indicator lamp shuts off remove the SCS service connector from the MES connector within 4 seconds The SRS lamp flashes twice to indicate memory has been erased Switch the ignition off and wait two to three seconds Turn the ignition switch on again The SRS indicator light should come on and go out after about 6 seconds Continue to monitor the SRS indicator and confirm that it does not come on again after 30 seconds Turn ignition switch off 10 4 Testing Transfer Case and Body Control Module BCM Figure 10 36 shows the diagnostic connector location for testing the transfer case and BCM
12. f flashes is the 10s digit the second set of flashes is the 1s digit For example FLASH FLASH pause FLASH FLASH FLASH is Code 23 Figure 10 33 1996 and newer Isuzu vehicles with 16 pin OBDII style connector location Figure 10 34 1996 and newer Isuzu vehicles with 16 pin OBDII style connector and jumper wire Table 10 9 suzu SRS Code Type 03 Pattern 10s and 1s Read codes on INFL REST or SRS indicator lamp Start codes by With ignition switch on jumper two terminals in a diagnostic connector together Only current codes will be flashed Figure 10 32 Figure 10 33 Clear codes by Codes cannot be cleared manually on these vehicles A factory scan tool must be used to clear SRS codes When done Disconnect jumper amp turn ignition off connector Each code is displayed one time before moving on to the next code After all of the codes have displayed the entire code sequence will repeat until the jumper wire is removed from the diagnostic Flash code 12 should always be the first code to flash which indicates that flash code mode has been enabled If there are no current or history codes flash code 12 will be flashed until the jumper is removed from the diagnostic connector Flash code 13 indicates that History codes are stored in memory A factory scan tool is needed to read history codes 10 3 2 Clearing SRS Codes Figure 10 35 1996 99 Oasis SRS code clearing left si
13. n and the engine off the instrument panel CHECK ENGINE lamp flashes stored trouble codes if any are present or code 12 if no codes are present The ECM also energizes all solenoids so you can use Field Service mode to test solenoid operation Field Service mode works differently depending on the engine e With acarbureted engine running the CHECK ENGINE LAMP stops flashing code 12 and new trouble codes cannot be set The ECM also sets ignition timing to a fixed degree of advance which lets you check and adjust timing for some models You also can use the Field Service mode for a system performance check on a carbureted engine Refer to a vehicle service manual for details e For some fuel injected engines the instrument panel CHECK ENGINE lamp flashes rapidly when the engine is running in open loop and slowly when in closed loop Additionally in closed loop the length of the lamp flash indicates whether the exhaust is rich or lean The lamp flash is longer if the exhaust is rich 10 2 Testing Antilock Brake System ABS 106 Isuzu ABS testing includes e ABS Code Reading Connectors and Locations on page 106 e Manual Code Reading ABS on page 108 e Clearing ABS Codes on page 111 10 2 1 ABS Code Reading Connectors and Locations Refer to Figure 10 19 and Table 10 4 for common Isuzu ABS diagnostic connector locations Figure 10 19 suzu common ABS connector locations Table 10 4 Common ABS connector location
14. nal on page 103 To read codes from 198512 89 I Mark and 1990 and later Impulse optional on page 103 97 98 Testing Engine and Transmission Systems 3 and 4 Under the Console Figure 10 1 suzu common engine connector location Table 10 1 Common engine connector locations VEHICLE YEAR CONNECTOR LOCATION Amigo 1990 94 1 ECM Ascender 2003 04 1 Axiom 2002 04 1 I Mark 1984 89 5 iapa 1984 89 5 1990 92 1 ECM Pickup 1990 95 1 ECM 1990 95 1 ECM Rodeo 1996 2004 1 Stylus 1990 93 1 ECM 1990 91 1 ECM Trooper 1992 94 6 ECM 1996 2002 1 Trooper 2 3L 1986 87 2 Trooper 2 6L 1988 91 4 Trooper 2 8L 1989 91 3 Vehicross 1999 2001 1 Figure 10 2 Common transmission connector locations Table 10 2 Common transmission connector locations VEHICLE YEAR CONNECTOR LOCATION Amigo 1990 94 1 Impulse 1990 92 1 Pickup 1990 95 1 Rodeo 1990 95 1 Stylus 1990 93 1 1990 91 1 Trooper 1992 94 2 NOTE i The 1984 85 Trooper connector is hard to find Figure 10 3 Figure 10 3 1984 1985 Isuzu Trooper diagnostic connector P To read codes from 1986 87 Trooper e Connect the MULTI 1 adapter to the ALDL or diagnostic connector Figure 10 4 on page 100 99 Testing Engine and Transmission Systems Figure 10 4 1986 87 Trooper connectors and adapter A ALDL connector B Diagnostic
15. o read codes from 1988 89 Impulse e Connectthe MULTI 1 adapter with the white terminal converters Figure 10 10 Figure 10 10 1988 89 Impulse connector and adapter A Diagnostic connector B MULTI 1 adapter C White D Green E Black 102 P To read codes from 19851 89 l Mark and 1990 and later Impulse e Connect the MULTI 2 D adapter to the white 3 pin connector Figure 10 11 on page 103 Figure 10 11 198512 89 I Mark 1990 and later Impulse connector and adapter A Diagnostic connector B MULTI 2 adapter C MULTI 2 D 10 1 2 Manual Code reading Engine Use one of the following procedures to manually read codes on I mark and Impulse models Isuzu engine and transmission systems flash Type 05 codes refer to Figure 10 14 and Table 10 3 on page 104 for Type 05 code information P To read codes from 1988 89 Impulse optional e Jump pins 2 and 3 as shown in Figure 10 12 Figure 10 12 1988 89 Impulse jump pins P To read codes from 19851 89 I Mark and 1990 and later Impulse optional e Jump pins as shown in Figure 10 13 103 Testing Engine and Transmission Systems Figure 10 13 198512 89 I Mark 1990 and later Impulse jump wire Code Type 05 0 4 Sec ve On Off First 1 1 Second qi 1 2 Digit 2 Digit 3 i j 1 t _ Code 23 _ gt t Code 12 gt Figure 10 14 suzu engine Code Type 05 Table 10 3 Engine Code Type 05 Pattern 10s and 1s Rea
16. pedal is not depressed turn the ignition switch to the off position Connect terminals 12 and 4 on the OBD II 16 pin diagnostic link connector Figure 10 20 Turn the ignition switch to the on position Clear codes by Within three seconds after entering the diagnostic mode pulsate the brake switch on and off at least six times When done Turn the ignition off disconnect the connectors and clear codes All codes repeat 3 ti diagnostic state mes and are followed by a 1 2 second pause Code 12 always flashes first to confirm the system is in the diagnostic mode Any current codes follow code 12 After the current codes have flashed follow If only historical codes are present the diagnostic sequence first flashes code 12 then code 13 followed by the historical codes The code display cycle repeats as long as the system is in the code 13 may flash Code 13 indicates the presence of history codes which then 10 2 3 Clearing ABS Codes Use this procedure to clear ABS codes on the 1996 99 Isuzu Oasis The following conditions must be met before DTC erasure mode will complete e The SCS check connector or jumper wire must be connected to the 2 pin service connector before the ignition switch is turned on See Figure 10 23 on page 109 for connector location e The brake pedal must be depressed before the ignition switch is turned on e Vehicle speed must be 6 mph 10kph or less P To clear ABS codes
17. rouble code with the 10s digit pulses staying on longer than the 1s digit pulses For example LONG LONG pause SHORT SHORT SHORT is Code 23 SRS Indicator Lamp SCS Service Connector Service Check 07PAZ 0010100 or Connector 2 Pin Jumper Wire Figure 10 28 suzu 1996 99 Oasis 2 pin service check connector location Indications are repeated in 1 2 20 20 case of continuous failure 11 31 1 1 1 Li lt Si gt Pulse I Code2 4 Code1 3 Code 1 1 Most recent Second most Third most problem recent problem recent problem Figure 10 29 suzu SRS Code Type 02a Continuous Failure SRS indicator flashes like this 112 Indications stay on in case of intermittent failure Key On i 2 1 H Pulse Code 2 1 Figure 10 30 suzu SRS Code Type 02a Intermittent Failure SRS indicator flashes like this System is normal Pe ae indicator will blink No Codes Figure 10 31 suzu SRS Code Type 02a Normal no failure SRS indicator flashes like this Table 10 8 suzu SRS Code Type 02a Pattern Long Short Main code sub code Read codes on SRS indicator lamp With ignition switch off connect SCS service connector OEM 07PAZ 0010100 or jumper wire to the 2 pin service check connector Turn ignition switch on Following the procedure in the Clearing SRS Codes section of this manual Procedure includes connecting and disconnecting the SCS service connector or jumper wire to the MES Memory Erase Signal
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