SFI SYSTEM, Diagnostic DTC:P0657

DTC Code DTC Name
P0657 Actuator Supply Voltage Circuit / Open

DESCRIPTION

The ECM monitors the output voltage to the throttle actuator. This self-check ensures that the ECM is functioning properly. The output voltage is usually 0 V when the power switch is turned off. If the output voltage is higher than 7 V when the power switch is turned off, the ECM will illuminate the MIL and set a DTC when the power switch is turned on (IG).

DTC No. DTC Detection Condition Trouble Area
P0657 Throttle actuator power supply error (1 trip detection logic) ECM

MONITOR STRATEGY

Required sensors/Components ECM
Frequency of operation Once per driving cycle

TYPICAL ENABLING CONDITIONS

Electronic throttle actuator power supply voltage 7 V or more

TYPICAL MALFUNCTION THRESHOLDS

Electric throttle actuator power supply On

CONFIRMATION DRIVING PATTERN


  1. Connect the GTS to the DLC3.

  2. Turn the power switch on (IG) and turn the GTS on.

  3. Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).

  4. Turn the GTS off.

  5. Turn the power switch off.

  6. Disconnect the GTS.

  7. Disconnect the cable from the negative (-) auxiliary battery terminal and wait for 1 minute.

  8. Connect the cable to the negative (-) auxiliary battery terminal.

  9. Turn the power switch on (IG).

  10. Wait 10 seconds or more.

  11. Turn the power switch off.

  12. Wait 15 seconds or more.

  13. Connect the GTS to the DLC3.

  14. Turn the power switch on (IG) and turn the GTS on.

  15. Wait 5 seconds or more.

  16. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

  17. Read the pending DTCs.

    Tech Tips


    • If a pending DTC is output, the system is malfunctioning.

    • If a pending DTC is not output, perform the following procedure.

  18. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

  19. Input the DTC: P0657.

  20. Check the DTC judgment result.

    GTS Display Description
    NORMAL

    • DTC judgment completed

    • System normal
    ABNORMAL

    • DTC judgment completed

    • System abnormal
    INCOMPLETE

    • DTC judgment not completed

    • Perform driving pattern after confirming DTC enabling conditions
    N/A

    • Unable to perform DTC judgment

    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    Tech Tips


    • If the judgment result shows NORMAL, the system is normal.

    • If the judgment result shows ABNORMAL, the system has a malfunction.

INSPECTION PROCEDURE

Tech Tips

Read freeze frame data using the GTS. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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. READ DTC OUTPUT (DTC P0657)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs Click here.

    5. Turn the power switch off.

    6. Turn the GTS off.

    7. Disconnect the GTS.

    8. Disconnect the cable from the negative (-) auxiliary battery terminal and wait for 1 minute.

    9. Connect the cable to the negative (-) auxiliary battery terminal.

    10. Turn the power switch on (IG).

    11. Wait for 10 seconds or more.

    12. Turn the power switch off.

    13. Wait for 15 seconds or more.

    14. Connect the GTS to the DLC3.

    15. Turn the power switch on (IG).

    16. Turn the GTS on.

    17. Wait for 5 seconds or more.

    18. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

    19. Check for DTCs.

      Result
      Result Proceed to
      DTC is not output A
      DTC P0657 is output B

    B

    REPLACE ECM Click here

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here