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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 112 (Engine Controls Self-Diagnostics - Pathfinder) >> Diagnostic Tests >> DTC P1065: Engine Control Module Power Supply (Back Up) Circuit >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition off. Disconnect ECM 116-pin harness connector. For ECM location, see Figure. Check voltage between body ground and ECM harness connector terminal No. 121 (White/Red wire). See Figure. Battery voltage should exist. If problem is found, go to next step. If no problem is found, go to step  3.
  2. Check following:
    • Check for poor, loose, corroded or damage to terminal connections in in-line harness connectors E1, M1, M32 and F23. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
    • Check fuse No. 62 (7.5-amp).
    • Check for open in circuit between fuse and ECM.
    Repair problem as necessary. After repair, repeat DTC CONFIRMATION TEST.
  3. Problem may be intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article. If no problem is found, go to next step. If any problem is found repair as necessary.
  4. Clear DTC. Repeat DTC CONFIRMATION TEST. If DTC resets, go to next step. If DTC does not reset, system is okay at this time.
  5. Replace ECM. See ENGINE CONTROL MODULE REPLACEMENT  under ENGINE CONTROL MODULE. Perform appropriate procedures under PROGRAMMING .
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