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Home >> Mitsubishi >> 2003 >> Lancer Evolution >> Repair and Diagnosis >> External Pages >> Different car >> Section 5 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P1640: Output Driver Module No. 1 Circuit Fault >> Diagnostic Procedure
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Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Isuzu Trooper. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform ON-BOARD DIAGNOSTIC II SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD-II system check, go to next step.
  2. Check fuse for driver circuit that was shown as faulty. If fuse is blown, go to next step. If fuse is not blown, go to step  4.
  3. Check for short to ground in suspect driver circuits between ODM drivers and fuses. See WIRING DIAGRAMS article. If problem is found, repair as necessary. After repair is complete, see VERIFYING VEHICLE REPAIR  under SELF-DIAGNOSTIC SYSTEM.
  4. Turn ignition off. Disconnect PCM 80-pin harness connectors E-21 (Blue) and E-22 (Red). PCM is located at right rear of engine compartment. Check for damaged pins, terminals or PCM harness connectors. If problem is found, go to next step. If no problem is found, leave PCM harness connector disconnected and go to step  6.
  5. Repair damaged pins, terminals or PCM harness connectors. After repair is complete, see VERIFYING VEHICLE REPAIR  under SELF-DIAGNOSTIC SYSTEM.
  6. Using scan tool, check if lamp circuit for CHECK ENGINE or CHECK TRANS is indicated as faulty. If lamp circuit for CHECK ENGINE or CHECK TRANS is indicated as faulty, go to next step. If no problem with circuits are indicated, go to step  13.
  7. Ensure PCM harness connectors are disconnected. Turn ignition on. Using DVOM, measure voltage between ground suspect MIL lamp driver circuit. See WIRING DIAGRAMS article. If battery voltage is present, go to step  15. If battery voltage is not present, go to next step.
  8. Turn ignition on. Using DVOM, check for battery voltage at C-10 METER GAUGE fuse. C-10 METER GAUGE fuse is located in dash fuse box. If battery voltage exists, go to step  10. If battery voltage does not exist, go to next step.
  9. Repair open in Black/Yellow wire between fuse C-10 and ignition switch. See WIRING DIAGRAMS article. After repair is complete, see VERIFYING VEHICLE REPAIR  under SELF-DIAGNOSTIC SYSTEM.
  10. Turn ignition off. Disconnect PCM 80-pin harness connectors E-21 (Blue) and E-22 (Red). PCM is located at right rear of engine compartment. Using DVOM, measure resistance between ground and suspect driver terminal in PCM harness connector. See WIRING DIAGRAMS article. If continuity exists in driver circuit, go to next step. If no continuity exists in driver circuit, go to step  12.
  11. Repair short to ground between suspect component and driver in PCM. After repair is complete, see VERIFYING VEHICLE REPAIR  under SELF-DIAGNOSTIC SYSTEM.
  12. Repair open circuit between suspect component and driver in PCM. After repair is complete, see VERIFYING VEHICLE REPAIR  under SELF-DIAGNOSTIC SYSTEM.
  13. Connect any disconnected PCM harness connectors. Start engine, and allow to idle. Backprobing measure voltage between ground and suspect driver terminal in PCM harness connector. If battery voltage exists, go to step  15. If battery voltage does not exist, leave engine idling and go to next step.
  14. Measure voltage at fuse for suspect driver circuit. If battery voltage exists, repeat test beginning in step  10. If battery voltage does not exist, repeat test beginning in step  9.
  15. Replace and reprogram PCM. See POWERTRAIN CONTROL MODULE REPLACEMENT  under POWERTRAIN CONTROL MODULE. Use scan tool to clear DTC and verify repair.
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