P0657

2AZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0657: Actuator Supply Voltage Circuit / Open

DTC P0657 - Actuator Supply Voltage Circuit / Open

MONITOR 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 ignition switch is turned to OFF. If the output voltage is higher than 7 volts when the ignition switch is turned to OFF, the ECM will illuminate the MIL and set the DTC when the ignition switch is turned to ON.






MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





INSPECTION PROCEDURE
HINT: Read freeze frame data using the Techstream. Freeze frame data records 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. READ OUTPUT DTC (DTC P0657)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream ON.
(d) Clear DTC DTC Check / Clear.
(e) Turn the ignition switch to OFF and turn the Techstream OFF.
(f) Disconnect the Techstream.
(g) Disconnect the cable from the battery negative (-) terminal and wait for 1 minute.
(h) Connect the cable to the battery negative (-) terminal.
(i) Turn the ignition switch to ON for 10 seconds.
(j) Turn the ignition switch to OFF.
(k) Turn the ignition switch to ON.
(l) Connect the Techstream to the DLC3.
(m) Turn the Techstream ON.
(n) Select the following menu items: Powertrain / Engine and ECT / Trouble Codes.
(o) Read DTCs.

Result





B -- REPLACE ECM
A -- CHECK FOR INTERMITTENT PROBLEMS