P0657

3UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0657: Actuator Supply Voltage Circuit / Open
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 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 set a DTC when the ignition switch is turned ON.





MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





CONFIRMATION DRIVING PATTERN





- Connect the Techstream to the DLC3.

- Turn the ignition switch to ON and turn the Techstream on.

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

- Turn the ignition switch off and wait for at least 30 seconds.

- Turn the ignition switch to ON and turn the Techstream on [A].

- Wait 5 seconds or more.

- Enter the following menus: Powertrain / Engine / Trouble Codes [B].

- Read the DTCs.

HINT
- If a DTC is output, the system is malfunctioning.
- If a DTC is not output, perform the following procedure.
- Enter the following menus: Powertrain / Engine / Utility / All Readiness.

- Input the DTC: P0657.

- Check the DTC judgment result.





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

- If the test result is INCOMPLETE or UNKNOWN and no DTC is output, perform a universal trip and check for permanent DTCs Reading and Clearing Diagnostic Trouble Codes.

HINT
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.
INSEPCTION PROCEDURE

PROCEDURE

1. CHECK DTC

(a) Clear DTCs.

(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) Read the DTCs.

OK:

P0657 is not present.

NG -- REPLACE ECM Service and Repair

OK -- CHECK FOR INTERMITTENT PROBLEMS