SFI SYSTEM, Diagnostic DTC:P0629

DTC Code DTC Name
P0629 Fuel Pump "A" Control Circuit High

DESCRIPTION

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0629 Fuel Pump "A" Control Circuit High

DTC Detection Condition


    Enable Criteria

  • Engine switch on (IG)


    Malfunction Criteria

  • -


    Diagnostic Mask

  • The MIL will be illuminated immediately if a fault is present


    Monitor

  • Continuous


    Potential failure modes

  • Fuel pump relay wiring open circuit or shorted to ground

  • Fuel pump relay failure

  • ECU output circuit failure

  • Fuel pump circuit

  • Fuel pump

  • ECM

 Come on DTC stored

MONITOR DESCRIPTION

The fuel system is of the non-return type. The fuel pump is incorporated into the fuel tank module, which also contains the level sensor, fuel pressure regulator and vapor pressure sensor. The ECM controls the fuel pump operation via a relay, because of this the only fault diagnosis is of the fuel pump relay.

WIRING DIAGRAM

Refer to Fuel Pump Control Circuit.

Click here

CAUTION / NOTICE / HINT

Note

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Tech Tips

Read freeze frame data using the GTS. Freeze frame data records the engine conditions when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE


  1. CHECK DTC OUTPUT (DTC P0629)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Trouble Codes.

    5. Read the DTCs.

      Result
      Result Proceed to
      DTC P0629 is output A
      DTC P0629 and other DTCs are output B

      Tech Tips

      If any DTCs other than P0629 are output, troubleshoot those DTCs first.


    B

    GO TO DTC CHART

    A

  2. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Active Test / Control the Fuel Pump / Speed.

    5. Check whether the fuel pump operating sound occurs when performing the Active Test on the GTS.

      Result
      Result Proceed to
      Fuel pump operating sound does not occur A
      Fuel pump operating sound occurs B

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here

    B

  3. CHECK HARNESS AND CONNECTOR (ECM - C/OPN RELAY)


    1. Disconnect the A116 ECM connector.

    2. Remove the C/OPN relay from the No. 2 engine room relay block assembly.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A116-32 (FPC) - 1 (C/OPN relay holder) Always Below 1 Ω
      A116-32 (FPC) or 1 (C/OPN relay holder) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    GO TO FUEL PUMP CONTROL CIRCUIT

    OK

  4. CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Enter the following menus: System Select / Health Check.

    4. Clear the DTCs.

      Result
      Proceed to
      NEXT

    NEXT

  5. CHECK DTC OUTPUT


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Trouble Codes.

    5. Read the DTCs.

      Result
      Result Proceed to
      DTC P0629 is output A
      DTC P0629 and other DTCs are output B

    A

    REPLACE ECM Click here

    B

    CHECK FOR INTERMITTENT PROBLEMS Click here