Lexus NX: Actuator Supply Voltage Circuit / Open (P0657)

Lexus NX Service Manual / Engine & Hybrid System / 2ar-fxe (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 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 store this DTC when the power switch is turned on (IG).

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory
P0657	Actuator Supply Voltage Circuit / Open	Throttle actuator power supply error (1 trip detection logic).	ECM	Comes on	DTC stored

MONITOR STRATEGY

Related DTCs	P0657: Electronic throttle actuator supply voltage circuit range check
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 the following DTCs are not stored	None
Both of the following conditions are met	-
Power switch	On (IG) to off
Electric throttle actuator power supply voltage	7 V or higher

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 power switch on (IG) and turn the Techstream on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the Techstream off.
Turn the power switch off.
Disconnect the Techstream.
Disconnect the cable from the negative (-) auxiliary battery terminal and wait for 1 minute.
Connect the cable to the negative (-) auxiliary battery terminal.
Turn the power switch on (IG).
Wait 10 seconds or more.
Turn the power switch off.
Wait 15 seconds or more.
Connect the Techstream to the DLC3.
Turn the power switch on (IG) and turn the Techstream on.
Wait 5 seconds or more.
Enter the following menus: Powertrain / Engine and ECT/ 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 and ECT / 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.
Click here
HINT:
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.

CAUTION / NOTICE / HINT

NOTICE:

After the power switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.
Click here
When disconnecting and reconnecting the auxiliary battery.
Click here

HINT:

When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.

Click here

HINT:

Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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 power switch on (IG).

(d) Clear the DTCs.

Click here

Powertrain > Engine and ECT > Clear DTCs

(e) Turn the Techstream off.

(f) Turn the power switch off.

(g) Disconnect the Techstream.

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

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

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

(k) Wait 10 seconds or more.

(l) Turn the power switch off.

(m) Wait 15 seconds or more.

(n) Connect the Techstream to the DLC3.

(o) Turn the power switch on (IG) and turn the Techstream on.

(p) Wait 5 seconds or more.

(q) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

(r) Read the DTCs.

Powertrain > Engine and ECT > Trouble Codes

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

CHECK FOR INTERMITTENT PROBLEMS

REPLACE ECM

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Components

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Terminals Of Ecu

TERMINALS OF ECU *a Component with harness connected (Power Steering ECU Assembly) - - CHECK POWER STEERING ECU ASSEMBLY (a) Measure the voltage and resistance according to the value(s) in the table below. NOTICE: When the power steering warning light (red) is illuminated due to a malfu

Lexus NX: Actuator Supply Voltage Circuit / Open (P0657)

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Terminals Of Ecu