Toyota Venza: Assist Map Number Un-Writing (C1581)

Toyota Venza Service Manual / Power Assist Systems / Power Steering System / Assist Map Number Un-Writing (C1581)

DESCRIPTION

The power steering ECU stores this DTC when it determines that the assist map is not written in the ECU.

HINT:

The assist map is data written in the power steering ECU to control the degree of assistance. The assist map is selected based on the vehicle's specified communication data.

DTC No.	DTC Detection Condition	Trouble Area
C1581	Assist map not written in power steering ECU	Power steering ECU CAN communication system ECM Brake actuator assembly (Skid control ECU)

PROCEDURE

1.	INITIALIZE ROTATION ANGLE SENSOR AND CALIBRATE TORQUE SENSOR ZERO POINT

(a) Initialize the rotation angle sensor value and calibrate the torque sensor zero point (See page ).

HINT:

The assist map is automatically written during the rotation angle sensor initialization and torque sensor zero point calibration.

2.	CHECK FOR DTC

(a) Check for DTCs (See page ).

OK:

DTC C1581 is not output.

HINT:

DTC C1581 will be cleared after the assist map is written.

END

3.	CHECK FOR DTC (CAN COMMUNICATION SYSTEM)

(a) Using the Techstream, check for DTCs and confirm that there are no problems in the CAN communication system (See page ).

OK:

DTC is not output.

GO TO CAN COMMUNICATION SYSTEM

CHECK ECM

(a) Check if an ECM that complies with the vehicle specifications is installed.

OK:

ECM that complies with vehicle specifications is installed.

Result

Result	Proceed to
OK	A
NG (for 2GR-FE)	B
NG (for 1AR-FE)	C

REPLACE ECM

5.	CHECK BRAKE ACTUATOR ASSEMBLY

(a) Check if a brake actuator assembly (skid control ECU) that complies with the vehicle specifications is installed.

OK:

Brake actuator assembly (skid control ECU) that complies with vehicle specifications is installed.

REPLACE POWER STEERING ECU

REPLACE BRAKE ACTUATOR ASSEMBLY

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DESCRIPTION When a problem occurs in the power steering system, the power source relay circuit is shut off to stop the power assist. DTC No. DTC Detection Condition ...

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DESCRIPTION The power steering ECU distinguishes the ignition switch status as ON or off through the IG power source circuit. DTC No. DTC Detection Condition Troub ...

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