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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 38 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P1065: ECM Power Supply Circuit (Back-Up) >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Nissan Maxima and 2002 Infiniti I35. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition off. Disconnect ECM harness connector. See Figure . Measure voltage between ground and ECM harness connector terminal No. 67 (White/Blue wire). See Figure . If battery voltage exists, go to step  3 . If battery voltage does not exist, go to next step.
  2. Check the following:
    • Check for poor connection at Black, 8-pin connector F18 terminal No. 2 (White/Blue wire). See Figure . For location, see Figure or Figure .
    • Check fuse No. 59 (15-amp) located in fuse and fusible link box on left side of engine compartment.
    • Check for open or short between ECM and fuse.
    • On I35, check White, 6-pin joint connector No. 13 (connector E74) located in relay box on right side of engine compartment. See Figure and Fig 1 .
    • On Maxima, check White, 6-pin joint connector No. 12 (connector E73) located in relay box on right side of engine compartment. See Figure and Fig 1 .

    On all models, repair as necessary.

  3. Check for intermittent condition. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article. If problem is found, repair as necessary. If problem is not found, go to next step.
  4. Reconnect all harness connectors. If using CONSULT-II, go to next step. If using generic scan tool, go to step  6 .
  5. Turn ignition on. Select SELF-DIAG RESULTS mode with CONSULT-II. Press ERASE. Perform DTC CONFIRMATION TEST  . If 1st trip DTC P1065 is detected again, replace ECM. If 1st trip DTC P1065 is not detected, test is complete.
  6. Turn ignition on. Using scan tool, select MODE 4 and clear DTCs. Perform DTC CONFIRMATION TEST  . If 1st trip DTC P1065 is detected again, replace ECM. If 1st trip DTC P1065 is not detected, test is complete.
Fig 1: Identifying Continuity Of Joint Connectors No. 9, 10, 12 & 13
G00103817Courtesy of NISSAN MOTOR CO., U.S.A.