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Home >> Isuzu >> 2000 >> Rodeo LSE, 2.2 D >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - 2.2L >> Diagnostic Trouble Code Identification >> DTC P1640: ODM Output Circuit Fault >> Diagnostic Procedure

Diagnostic Procedure

  1. Perform On-Board Diagnostic II OBD-II system check. See SELF-DIAGNOSTICS - INTRODUCTION article. Go to next step.
  2. Use scan tool to check DRIVER MODULE STATUS. Check fuse for driver circuit that has indicated malfunction. See appropriate diagram in WIRING DIAGRAMS article. If fuse was blown, go to next step. If fuse was okay, go to step  4.
  3. Locate short circuit to ground between blown fuse and affected component. Repair as necessary and replace blown fuse.
  4. Disconnect PCM harness connector for the affected driver circuit. Inspect harness connector for damage at PCM pin or harness connector terminals. If any problems were found, go to next step. If no problems were found, go to step  6.
  5. Repair damaged pin or harness connector terminal. Retest system.
  6. If affected driver circuit was for CHECK ENGINE light (MIL), go to next step. If not, go to step  13.
  7. Leave PCM connector disconnected. Turn ignition on. Using DVOM, check for voltage at PCM harness connector for affected lamp driver circuit. If voltage reading is equal to battery voltage, go to step  15. If voltage reading is not as specified, go to next step.
  8. Check for battery voltage at fuse for affected lamp driver circuit. See appropriate diagram in WIRING DIAGRAMS article. If battery voltage is available at fuse, go to step  10.If battery voltage is not available at fuse, go to next step.
  9. Repair open circuit between ignition switch and fuse. Retest system.
  10. Leave PCM connector disconnected. Using DVOM, check for continuity between ground and PCM harness connector terminal for affected lamp driver. If continuity is present, go to next step. If continuity is not present, go to step  12.
  11. Repair short circuit to ground between affected component and PCM driver terminal. Retest system.
  12. Repair open circuit between affected component and PCM driver terminal. Retest system.
  13. Reconnect PCM harness connector. Start engine and allow it to idle. Using DVOM, measure voltage by backprobing PCM harness connector terminal for affected driver circuit. If DVOM indicates battery voltage, go to step  15. If battery voltage is not indicated, go to next step.
  14. Run engine at idle. Use DVOM to measure voltage at fuse for affected circuit. If DVOM indicates battery voltage, go to step  10. If battery voltage is not indicated, go to step  9.
  15. Replace and reprogram PCM using required equipment. See PROGRAMMING . Retest system.
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