Toyota Tundra Service Manual: Actuator Supply Voltage Circuit / Open (P0657)

Toyota Tundra Service Manual / Engine, Hybrid System / 1ur-fe Engine Control / Sfi System / Actuator Supply Voltage Circuit / Open (P0657)

DESCRIPTION

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

DTC No.

DTC Detection Condition

Trouble Area

P0657

Throttle actuator power supply error

(1 trip detection logic)

ECM

MONITOR STRATEGY

Related DTCs

None

Required sensors/Components (Main)

ECM

Required sensors/Components (Related)

Throttle actuator

Frequency of operation

Once per driving cycle

Duration

-

MIL operation

Immediate

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

Ignition switch

From ON to OFF

Throttle actuator power supply voltage

7 V or more

TYPICAL MALFUNCTION THRESHOLDS

Throttle actuator power supply

ON

CONFIRMATION DRIVING PATTERN

  1. Connect the Techstream to the DLC3.
  2. Turn the ignition switch to ON and turn the Techstream on.
  3. Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).
  4. Turn the ignition switch off and wait for at least 30 seconds.
  5. Turn the ignition switch to ON and turn the Techstream on.
  6. Wait 5 seconds or more.
  7. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
  8. Read the pending DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
  9. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
  10. Input the DTC: P0657.
  11. Check the DTC judgment result.

    Tester 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

    HINT:

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

  12. If the test result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs (See page ).

    HINT:

    • If a permanent DTC is output, the system is malfunctioning.
    • If no permanent DTC is output, the system is normal.

CAUTION / NOTICE / HINT

NOTICE:

After turning ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work (See page ).

HINT:

Read freeze frame data using a Techstream. Freeze frame data record the engine condition 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 FOR DTC

(a) Clear DTCs (See page ).

(b) Turn the ignition switch off.

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

(d) Connect the cable to the negative (-) battery terminal.

(e) Turn the ignition switch to ON for 10 seconds.

(f) Turn the ignition switch off.

(g) Turn the ignition switch to ON.

(h) Check for DTCs.

OK:

P0657 is not present.

OK

CHECK FOR INTERMITTENT PROBLEMS

NG

REPLACE ECM

    VIN not Programmed or Mismatch - ECM / PCM (P0630)

    Brake Switch "B" Circuit High (P0724)

    See More:

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