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Home › Infiniti › 2008 › EX35 Base, AWD › Repair and Diagnosis › Engine Performance › Engine Control Systems › Engine Control System - DTCS P0451 To P1212 › P0603 ECM Power Supply › Diagnosis Procedure

Diagnosis Procedure

  1. CHECK ECM POWER SUPPLY
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the voltage between ECM harness connector terminals under the following conditions.
      VOLTAGE SPECIFICATIONS

      ECM Voltage
      + -
      Connector Terminal Connector Terminal
      F102 93 M107 128 Battery voltage

    Is the inspection result normal? 

    YES: GO TO  3.

    NO: GO TO 2.

  2. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E3, F1
    • 15A fuse (No. 50)
    • IPDM E/R harness connector E7
    • Harness for open or short between ECM and battery

    Repair or replace harness or connectors.

  3. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    Is the inspection result normal? 

    YES: GO TO 4.

    NO: Repair or replace harness or connectors.

  4. PERFORM DTC CONFIRMATION PROCEDURE
    1. Turn ignition switch ON.
    2. Erase DTC.
    3. Perform DTC Confirmation Procedure.

      +See "DTC LOGIC ".

    Is the 1st trip DTC P0603 displayed again? 

    YES: GO TO 5.

    NO: INSPECTION END

  5. REPLACE ECM
    1. Replace ECM.
    2. Go to "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : SPECIAL REPAIR REQUIREMENT ".

    INSPECTION END

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