LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Infiniti >> 2016 >> Q50 Base, RWD >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (DTCS) (Except Hybrid) (3 Of 5) >> DTC/Circuit Diagnosis >> DTC P0629: Fuel Pump Control >> Fuel Pump Control Module (FPCM) >> Diagnosis Procedure >> Diagnostic Test
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Diagnostic Test

  1. INSPECTION START

    Check the following items.

    • Out of gas
    • Low fuel pressure line open

    Is the inspection result normal?

    YES 

    GO TO STEP 2  .

    NO 

    Repair or replace error-detected parts.

  2. COMPONENT FUNCTION CHECK

    1. Turn ignition switch OFF and wait at least 30 seconds.
    2. Listen to fuel pump operation sound for a few seconds after ignition switch is turned ON.

    Is the inspection result normal?

    YES 

    INSPECTION END

    NO 

    GO TO STEP 3  .

  3. CHECK FPCM POWER SUPPLY

    Check FPCM power supply and ground circuit. Refer to DIAGNOSIS PROCEDURE .

    Is the inspection result normal?

    YES 

    GO TO STEP 4  .

    NO 

    Repair or replace error-detected parts.

  4. CHECK FUEL PUMP CONTROL CIRCUIT

    1. Turn ignition switch OFF.
    2. Disconnect FPCM harness connector and fuel pump harness connector.
    3. Check the continuity between FPCM harness connector and fuel pump harness connector.
      + - Continuity
      FPCM Fuel pump
      Connector Terminal Connector Terminal
      B133 11 B101 6 Existed
      12 5
    4. Also check harness for short to ground.

    Is the inspection result normal?

    YES 

    GO TO STEP 5  .

    NO 

    Repair or replace error-detected parts.

  5. CHECK FUEL PUMP

    Check fuel pump. Refer to COMPONENT INSPECTION (FUEL PUMP) .

    Is the inspection result normal?

    YES 

    GO TO STEP 6  .

    NO 

    Replace fuel pump.

  6. CHECK FUEL PUMP ACTIVATION SIGNAL CIRCUIT

    1. Disconnect ECM harness connector.
    2. Check the continuity between FPCM harness connector and ECM connector.
      + - Continuity
      FPCM ECM
      Connector Terminal Connector Terminal
      B134 2 E200 127 Existed
    3. Also check harness for short to ground.

    Is the inspection result normal?

    YES 

    INSPECTION END

    NO 

    Repair or replace error-detected parts.