Toyota Venza: Actuator Supply Voltage Circuit / Open (P0657)

Toyota Venza Service Manual / 1ar-fe Engine Control / Sfi System / Actuator Supply Voltage Circuit / Open (P0657)

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 off. If the output voltage is higher than 7 V when the ignition switch is turned off, the ECM illuminates the MIL and stores the DTC when the ignition switch is turned to ON.

DTC No.	DTC Detection Condition	Trouble Area
P0657	A throttle actuator power supply error (1 trip detection logic)	ECM

MONITOR STRATEGY

Related DTCs	P0657: Electronic Throttle Actuator Supply Voltage Circuit Performance
Required Sensors/Components (Main)	ECM
Required Sensors/Components (Related)	Throttle actuator
Frequency of Operation	Once per driving cycle
Duration	-
MIL Operation	Immediate
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever following DTCs not stored	None
Both of the following conditions are met	-
Electronic throttle actuator power supply voltage	7 V or higher
Ignition switch	ON to off

TYPICAL MALFUNCTION THRESHOLDS

Both of the following conditions are met	-
Last trip condition	Met
Command to electronic throttle actuator power	ON

CONFIRMATION DRIVING PATTERN

Connect the Techstream to the DLC3.
Turn the ignition switch to ON and turn the Techstream on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC operation) (See page ).

Turn the Techstream off.
Turn the ignition switch off.
Disconnect the Techstream.
Disconnect the cable from the negative (-) battery terminal and wait for 1 minute.
Connect the cable to the negative (-) battery terminal.
Turn the ignition switch to ON.
Wait 10 seconds or more.
Turn the ignition switch off.
Wait 15 seconds or more.
Connect the Techstream to the DLC3.
Turn the ignition switch to ON and turn the Techstream on.
Wait 5 seconds or more.
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read the pending DTCs.
HINT:
- If a pending DTC is output, the system is malfunctioning.
- If a pending 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.

Techstream Display	Description
NORMAL	DTC judgment completed System normal
ABNORMAL	DTC judgment completed System abnormal
INCOMPLETE	DTC judgment not completed Perform driving pattern after confirming DTC enabling conditions
N/A	Unable to perform DTC judgment Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

HINT:

If the judgment result shows NORMAL, the system is normal.
If the judgment result shows ABNORMAL, the system has a malfunction.

If the judgment result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs (See page ).
HINT:
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.

CAUTION / NOTICE / HINT

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.

(d) Clear the DTC (See page ).

(e) Turn the ignition switch off.

(f) Turn the Techstream off.

(g) Disconnect the Techstream.

(h) Disconnect the cable from the negative (-) battery terminal and wait for 1 minute.

(i) Connect the cable to the negative (-) battery terminal.

(j) Turn the ignition switch to ON.

(k) Wait 10 seconds or more.

(l) Turn the ignition switch off.

(m) Wait 15 seconds or more.

(n) Connect the Techstream to the DLC3.

(o) Turn the ignition switch to ON.

(p) Turn the Techstream on.

(q) Wait 5 seconds or more.

(r) Enter the following menus: Powertrain / Engine / Trouble Codes.

(s) Read the DTCs.

Result

Result	Proceed to
DTC is not output	A
DTC P0657 is output	B

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