P0657

3MZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0657: Actuator Supply Voltage Circuit / Open

DTC P0657 - Actuator Supply Voltage Circuit / Open

DESCRIPTION

The ECM (included in the 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 is usually 0 V when the power switch is turned off. If the output voltage is higher than 7 V when the power switch is turned off, the ECM will illuminate the MIL and set a DTC when the power switch on (IG).






MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





INSPECTION PROCEDURE

PROCEDURE

1. CHECK WHETHER DTC OUTPUT RECURS (DTC P0657)
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG) and turn the Techstream on.
(c) Clear the DTCs DTC Check / Clear.
(d) Turn the power switch off and turn the Techstream off.
(e) Disconnect the auxiliary battery negative terminal and wait for 1 minute.
(f) Connect the auxiliary battery negative terminal.
(g) Turn power switch on (IG) for 10 seconds.
(h) Turn the power switch off.
(i) Turn the power switch on (IG) and turn the Techstream on.
(j) Select the following menu items: Powertrain / Engine and ECT / Trouble Codes.
(k) Read the DTCs.
Result:






B -- CHECK FOR INTERMITTENT PROBLEMS
A -- REPLACE HYBRID VEHICLE CONTROL ECU