LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Infiniti >> 2013 >> M56 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P0190 To P1084 >> DTC P0603: ECM Power Supply >> Diagnosis Procedure
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

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.
      ECM Voltage
      + -
      Connector Terminal Connector Terminal
      M160 156 M160 175 Battery voltage

      Is the inspection result normal? 

      YES: GO TO  3.

      NO: GO TO 2.

  2. DETECT MALFUNCTIONING PART 

    Check the following.

    • 15 A fuse (No. 51)
    • Harness for open or short between ECM and battery
    • Loose or poor connection for each connector and harness

      : 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 

    Replace ECM. Refer to "REMOVAL AND INSTALLATION ".

    : INSPECTION END

scientia non olet · About LEMON Manuals