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Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Isuzu Rodeo Sport and 2002 Isuzu Rodeo. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform ON-BOARD DIAGNOSTIC II SYSTEM CHECK  . After performing OBD-II system check, go to next step.
  2. Turn ignition off. Disconnect PCM 32-pin harness connectors C-1 (Red), C-2 (White) and C-3 (Blue). PCM is located under center console in front of shifter. Turn ignition on. Check for poor connections, opens or shorts in 5-volt reference circuits for suspect sensors. See WIRING DIAGRAMS article. If problem is found, go to next step. If no problem is found, leave harness connector disconnected and go to step  4 .
  3. Repair suspect 5-volt reference circuit as necessary. After repair is complete, see VERIFYING VEHICLE REPAIR  under SELF-DIAGNOSTIC SYSTEM.
  4. Check for poor connections or open in suspect sensor ground circuits. See WIRING DIAGRAMS article. If problem is found, go to next step. If no problem is found, leave harness connector disconnected and go to step  6 .
  5. Repair suspect ground circuit(s) as necessary. After repair is complete, see VERIFYING VEHICLE REPAIR  under SELF-DIAGNOSTIC SYSTEM.
  6. Using DVOM, measure voltage between ground and PCM harness connector C-1 terminal B7 (Yellow/Red wire). See Fig 1 , and WIRING DIAGRAMS article. Voltage should be near zero volts. If voltage is as specified, go to next step. If voltage is not as specified, go to step  13 .
  7. Using DVOM, measure voltage between ground and PCM harness connector C-3 terminal F8 (Gray wire). See Fig 1 , and WIRING DIAGRAMS article. Voltage should be near zero volts. If voltage is as specified, go to next step. If voltage is not as specified, go to step  14 .
  8. Using DVOM, measure voltage between ground and PCM harness connector C-3 terminal E8 (Blue wire). See Fig 1 , and WIRING DIAGRAMS article. Voltage should be near zero volts. If voltage is as specified, go to next step. If voltage is not as specified, go to step  15 .
  9. Using DVOM, measure voltage between ground and PCM harness connector C-1 terminal B8 (Yellow/Green wire). See Fig 1 , and WIRING DIAGRAMS article. Voltage should be near zero volts. If voltage is as specified, go to next step. If voltage is not as specified, go to step  16 .
  10. Using DVOM, measure voltage between ground and PCM harness connector C-3 terminal E9 (Blue/Red wire). See Fig 1 , and WIRING DIAGRAMS article. Voltage should be near zero volts. If voltage is as specified, go to step  20 . If voltage is not as specified, go to step  17 .
  11. Using DVOM, measure voltage between ground and PCM harness connector C-1 terminal B9 (Green wire). See Fig 1 , and WIRING DIAGRAMS article. Voltage should be near zero volts. If voltage is as specified, go to next step. If voltage is not as specified, go to step  18 .
  12. Disconnect EGR valve 5-pin harness connector. EGR valve is located at top rear of engine. Measure voltage between ground and PCM harness connector C-1 terminal B7 (Yellow/Red wire). See Fig 1 , and WIRING DIAGRAMS article. Voltage should be near zero volts. If voltage is as specified, go to next step. If voltage is not as specified, go to step  19 .
  13. Replace EGR valve. See REMOVAL, OVERHAUL & INSTALLATION article. After repair is complete, see VERIFYING VEHICLE REPAIR  under SELF-DIAGNOSTIC SYSTEM.
  14. Locate and repair short to voltage in Gray wire (MAP sensor signal) between PCM and MAP sensor. After repair is complete, see VERIFYING VEHICLE REPAIR  under SELF-DIAGNOSTIC SYSTEM.
  15. Locate and repair short to voltage in Blue wire (TP sensor signal) between PCM and TP sensor. After repair is complete, see VERIFYING VEHICLE REPAIR  under SELF-DIAGNOSTIC SYSTEM.
  16. Locate and repair short to voltage in Yellow/Green wire (IAT sensor signal) between PCM and IAT sensor. After repair is complete, see VERIFYING VEHICLE REPAIR  under SELF-DIAGNOSTIC SYSTEM.
  17. Locate and repair short to voltage in Blue/Red wire (ECT sensor signal) between PCM and ECT sensor. After repair is complete, see VERIFYING VEHICLE REPAIR  under SELF-DIAGNOSTIC SYSTEM.
  18. Locate and repair short to voltage in Green wire (A/C pressure switch signal) between PCM and A/C pressure switch. After repair is complete, see VERIFYING VEHICLE REPAIR  under SELF-DIAGNOSTIC SYSTEM.
  19. Locate and repair short to voltage in Yellow/Red wire (EGR valve pintle signal) between PCM and EGR valve. After repair is complete, see VERIFYING VEHICLE REPAIR  under SELF-DIAGNOSTIC SYSTEM.
  20. Replace and reprogram PCM. See POWERTRAIN CONTROL MODULE REPLACEMENT  under POWERTRAIN CONTROL MODULE. Repeat OBD-II system check. See ON-BOARD DIAGNOSTIC II SYSTEM CHECK  .
Fig 1: Identifying Powertrain Control Module Harness Connector Terminals
G00077243Courtesy of ISUZU MOTOR CO.
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