Toyota CH-R Service Manual: Assist Map Number Un-Writing (C1581)

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

DESCRIPTION

This DTC will be stored if the power steering ECU assembly determines that the assist map is not written in the ECU.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Warning Indicate	Return-to-normal Condition	Note
C1581	Assist Map Number Un-Writing	Assist map not written in power steering ECU assembly	CAN communication system ECM Main body ECU (Multiplex network body ECU) Skid control ECU (Brake actuator assembly) Power steering ECU assembly	EPS warning light: Comes on	Assist Map Writing is performed or the ignition switch is turned ON again	-

CAUTION / NOTICE / HINT

NOTICE:

If the power steering ECU assembly has been replaced, perform assist map writing and torque sensor zero point calibration.

Click here

HINT:

Related parts store information necessary for assist map writing.

Related Part:

ECM
Main body ECU (Multiplex network body ECU)
Skid control ECU (Brake actuator assembly)

PROCEDURE

1.	PERFORM ASSIST MAP WRITING

(a) Perform assist map writing.

Click here

Chassis > EMPS > Utility

Tester Display
Signal Check

(b) Check for DTCs.

Click here

Chassis > EMPS > Trouble Codes

Result	Proceed to
DTC C1581 is output.	A
DTC C1581 is not output.	B

NOTICE:

DTC C1581 is cleared after the assist map is written.

END

2.	CHECK CAN COMMUNICATION SYSTEM

(a) Check for DTCs.

Click here

Result	Proceed to
CAN communication system DTCs are not output.	A
CAN communication system DTCs are output.	B

GO TO CAN COMMUNICATION SYSTEM

3.	CHECK RELATED PART

(a) Confirm if the related part has the correct part number.

Related Part	ECM
	Main body ECU (Multiplex network body ECU)
	Skid control ECU (Brake actuator assembly)

NOTICE:

When removing the related part to check it, be sure to follow the appropriate procedures and precautions.

ECM
Click here
Main body ECU (Multiplex network body ECU)
Click here
Skid control ECU (Brake actuator assembly)

Result	Proceed to
The related part has the correct part number.	A
The related part has an incorrect part number.	B

GO TO STEP 5

4.	CHECK FOR DTC

(a) Select Health Check on the Techstream screen and check if system DTCs of the related part are output.

HINT:

If system DTCs of the related part are stored, assist map writing to the power steering ECU assembly may not be performed properly.

Result	Proceed to
System DTCs of the related part are output.	A
System DTCs of the related part are not output.	B

REPAIR CIRCUIT INDICATED BY OUTPUT CODE

REPLACE POWER STEERING ECU ASSEMBLY

5.	REPLACE RELATED PART WITH PART THAT HAS CORRECT PART NUMBER

(a) Replace the related part with one that has the correct part number.

ECM
Click here
Main body ECU (Multiplex network body ECU)
Click here
Skid control ECU (Brake actuator assembly)

6.	CHECK FOR DTC

(a) Check for DTCs.

Click here

Chassis > EMPS > Trouble Codes

Result	Proceed to
DTCs are not output.	A
DTCs are output.	B

END

REPLACE POWER STEERING ECU ASSEMBLY

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Toyota CH-R Service Manual: Assist Map Number Un-Writing (C1581)

Torque Sensor Zero Point Adjustment Undone (C1515)

IG Power Supply Voltage (C1551)

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