P0657

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

DESCRIPTION

The ECM (included in hybrid vehicle control ECU) 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 power switch is turned off. If the output voltage is higher than 7 volts when the power switch is turned off, the ECM will illuminate the MIL and set a DTC when the power 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 Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the tester on.

(d) Clear the DTC.

(e) Turn the power switch off and turn the Techstream off.

(f) Disconnect the Techstream.

(g) Disconnect the auxiliary battery negative terminal and wait for 1 minute.

(h) Connect the auxiliary battery negative terminal.

(i) Turn the power switch on (IG) for 10 seconds.

(j) Turn the power switch off.

(k) Turn the power switch on (IG).

(l) Connect the Techstream to the DLC3.

(m) Turn the Techstream on.

(n) Enter the following menus: Powertrain / Engine / Trouble Code.

(o) Read the DTCs.

Result:





B -- REPLACE HYBRID VEHICLE CONTROL ECU Removal

A -- CHECK FOR INTERMITTENT PROBLEMS Check for Intermittent Problems