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Home >> Nissan-Datsun >> 2009 >> Maxima S >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Introduction >> Component Diagnosis >> Power Supply And Ground Circuit >> Diagnosis Procedure
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Diagnosis Procedure

  1. CHECK GROUND CONNECTION-I
    1. Turn ignition switch OFF.
    2. Check ground connection E9. Refer to Ground Inspection in "CIRCUIT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 2.

    NO: Repair or replace ground connection.

  2. CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-I
    1. Disconnect ECM harness connector.
    2. Check the continuity between ECM harness connector and ground.
      TERMINAL CONNECTOR REFERENCE CHART

      ECM Ground Continuity
      Connector Terminal
      F14 12 Ground Existed
      16
      E10 107
      108
      111
      112
    3. Also check harness for short to power.

    is the inspection result normal? 

    YES: GO TO 4.

    NO: GO TO 3.

  3. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E11, F2
    • Harness for open or short between ECM and ground

    : Repair open circuit, short to power in harness or connectors.

  4. CHECK ECM POWER SUPPLY CIRCUIT-I
    1. Reconnect ECM harness connector.
    2. Turn ignition switch OFF and then ON.
    3. Check the voltage between ECM harness connectors.
    TERMINAL CONNECTOR REFERENCE CHART

    ECM Voltage
    Connector + -
    Terminal Terminal
    E10 93 112 Battery voltage
    Fig 1: Checking Voltage Between ECM Harness Connectors Terminals 93 And 112
    G05869708Courtesy of NISSAN MOTOR CO., U.S.A.

    Is the inspection result normal? 

    YES: GO TO 6.

    NO: GO TO 5.

  5. DETECT MALFUNCTIONING PART

    Check the following.

    • IPDM E/R connector E18
    • 10 A fuse (No. 35)
    • Harness for open or short between ECM and fuse

    : Repair open circuit, short to ground or short to power in harness or connectors.

  6. CHECK ECM POWER SUPPLY CIRCUIT-II
    1. Turn ignition switch OFF and wait at least 10 seconds.
    2. Check the voltage between ECM harness connectors.
    TERMINAL CONNECTOR REFERENCE CHART

    ECM Voltage
    Connector + -
    Terminal Terminal
    E10 105 112 After turning ignition switch OFF, battery voltage will exist for a few seconds, then drop to approximately 0 V.
    Fig 2: Checking Voltage Between ECM Harness Connectors Terminals 105 And 112
    G05869709Courtesy of NISSAN MOTOR CO., U.S.A.

    Is the inspection result normal? 

    YES: GO TO 7.

    NO: GO TO 9.

  7. CHECK ECM POWER SUPPLY CIRCUIT-III
    1. Turn ignition switch ON.
    2. Check the voltage between IPDM E/R harness connector and ground.
    TERMINAL CONNECTOR REFERENCE CHART

    IPDM E/R Ground Voltage
    Connector Terminal
    F10 49 Ground Battery voltage
    53
    Fig 3: Checking Voltage Between IPDM E/R Harness Connector And Ground
    G05869710Courtesy of NISSAN MOTOR CO., U.S.A.

    Is the inspection result normal? 

    YES: GO TO 8.

    NO: Replace IPDM E/R.

  8. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    : INSPECTION END

  9. CHECK ECM POWER SUPPLY CIRCUIT-IV
    1. Turn ignition switch OFF and wait at least 10 seconds.
    2. Check the voltage between ECM harness connectors.
    TERMINAL CONNECTOR REFERENCE CHART

    ECM Voltage
    + -
    Connector Terminal Connector Terminal
    F14 24 E10 112 Battery voltage
    Fig 4: Checking Voltage Between ECM Harness Connectors
    G05869711Courtesy of NISSAN MOTOR CO., U.S.A.

    Is the inspection result normal? 

    YES: GO TO 12.

    NO: GO TO 10.

  10. CHECK ECM POWER SUPPLY CIRCUIT-V
    1. Disconnect ECM harness connector.
    2. Disconnect IPDM E/R harness connector.
    3. Check the continuity between ECM harness connector and IPDM E/R harness connector.
      TERMINAL CONNECTOR REFERENCE CHART

      ECM IPDM E/R Continuity
      Connector Terminal Connector Terminal
      F14 24 F10 69 Existed
    4. Also check harness for short to ground and short to power.

    Is the inspection result normal? 

    YES: GO TO 11.

    NO: Repair open circuit, short to ground or short to power in harness or connectors.

  11. CHECK 15 A FUSE
    1. Disconnect 15 A fuse (No. 42) from IPDM E/R.
    2. Check 15 A fuse.

    Is the inspection result normal? 

    YES: GO TO 14.

    NO: Replace 15 A fuse.

  12. CHECK ECM POWER SUPPLY CIRCUIT-VI
    1. Disconnect ECM harness connector.
    2. Disconnect IPDM E/R harness connector.
    3. Check the continuity between ECM harness connector and IPDM E/R harness connector.
      TERMINAL CONNECTOR REFERENCE CHART

      ECM IPDM E/R Continuity
      Connector Terminal Connector Terminal
      E10 105 E18 10 Existed
    4. Also check harness for short to ground and short to power.

    Is the inspection result normal? 

    YES: GO TO 14.

    NO: GO TO 13.

  13. DETECT MALFUNCTIONING PART

    Check the following.

    • Junction block connectors E44, E45
    • Harness for open or short between ECM and IPDM E/R

    : Repair open circuit, short to ground or short to power in harness or connectors.

  14. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    Is the inspection result normal? 

    YES: Replace IPDM E/R.

    NO: Repair or replace harness or connectors.

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