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Home >> Infiniti >> 2012 >> G37 Base, 2D Convertible >> Repair and Diagnosis >> External Pages >> Different car >> Section 111 (EV Control System) >> DTC/Circuit Diagnosis >> DTC P3131: System Shutoff Error >> Diagnosis Procedure
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Diagnosis Procedure

WARNING: This page is about a different car, the 2011 Nissan Leaf. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK VCM POWER SUPPLY CIRCUIT

    Select the DATA MONITOR item "POWER SW" of "VCM" with CONSULT. Refer to "CONSULT FUNCTION ".

    Is indicate "ON"? 

    YES: Go to 2.

    NO: Repair VCM power ON power supply circuit. Refer to "VCM: DIAGNOSIS PROCEDURE ".

  2. CHECK TRACTION MOTOR INVERTER POWER SUPPLY (POWER ON) CIRCUIT
    1. Turn power switch OFF.
    2. Disconnect traction motor inverter harness connector F13.
    3. Perform confirmation procedure. Refer to "DTC LOGIC ".

    Is "P3131" detected? 

    YES: Go to 3.

    NO: Check traction motor inverter power supply (POWER ON) circuit for short to power.

  3. CHECK LBC POWER SUPPLY (POWER ON) CIRCUIT
    1. Disconnect LBC harness connector B24.
    2. Perform confirmation procedure. Refer to "DTC LOGIC ".

    Is "P3131" detected? 

    YES: Go to 4.

    NO: Check LBC power supply (POWER ON) circuit for short to power.

  4. CHECK ON BOARD CHARGER POWER SUPPLY (POWER ON) CIRCUIT
    1. Disconnect on board charger harness connector B26.
    2. Perform confirmation procedure. Refer to "DTC LOGIC ".

    Is "P3131" detected? 

    YES: Go to 5.

    NO: Check on board charger power supply (POWER ON) circuit for short to power.

  5. CHECK A/C AUTO AMP. POWER SUPPLY (POWER ON) CIRCUIT
    1. Disconnect A/C auto amp. harness connector M50.
    2. Perform confirmation procedure. Refer to "DTC LOGIC ".

    Is "P3131" detected? 

    YES: Go to 6.

    NO: Check A/C auto amp. power supply (POWER ON) circuit for short to power.

  6. CHECK TCU POWER SUPPLY (POWER ON) CIRCUIT
    1. Disconnect TCU harness connector M2.
    2. Perform confirmation procedure. Refer to "DTC LOGIC ".

    Is "P3131" detected? 

    YES: Go to 7.

    NO: Check TCU power supply (POWER ON) circuit for short to power.

  7. CHECK ELECTRIC SHIFT CONTROL MODULE POWER SUPPLY (POWER ON) CIRCUIT
    1. Disconnect electric shift control module harness connector M59.
    2. Perform confirmation procedure. Refer to "DTC LOGIC ".

    Is "P312A" detected? 

    YES: Replace VCM. Refer to "REMOVAL AND INSTALLATION ".

    NO: Check electric shift control module power supply (POWER ON) circuit for short to power.

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