P0657

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

DTC 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 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





INSPECTION PROCEDURE

PROCEDURE

1. CHECK WHETHER DTC OUTPUT RECURS (IN ADDITION TO DTC P0657)
(a) Connect the intelligent tester to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) Turn the tester on.
(d) Clear the DTC.
(e) Turn the ignition switch off.
(f) Disconnect the battery negative terminal and wait for 1 minute.
(g) Connect the battery negative terminal.
(h) Turn the ignition switch to the ON position for 10 seconds.
(i) Turn the ignition switch off.
(j) Turn the ignition switch to the ON position.
(k) Enter the following menus: DIAGNOSIS / ENHANCED II / DTC INFO / CURRENT CODES.
(l) Read the DTCs.
Result:






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