POWER ASSIST SYSTEMS: POWER STEERING SYSTEM: C1581; Assist Map Number Un-Writing; 2019 MY RAV4 RAV4 HV [11/2018

Last Modified: 01-30-2024	6.11:8.1.0	Doc ID: RM100000001ERXD
Model Year Start: 2019	Model: RAV4	Prod Date Range: [11/2018 - 02/2019]
Title: POWER ASSIST SYSTEMS: POWER STEERING SYSTEM: C1581; Assist Map Number Un-Writing; 2019 MY RAV4 RAV4 HV [11/2018 - 02/2019]

DTC

C1581

Assist Map Number Un-Writing

DESCRIPTION

This DTC will be stored if the power steering ECU (rack and pinion power steering gear 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 (rack and pinion power steering gear assembly)	for Gasoline Model: CAN communication system ECM Main body ECU (Multiplex network body ECU) Skid control ECU (Brake actuator assembly) Rack and pinion power steering gear assembly for HV Model: CAN communication system Hybrid vehicle control ECU assembly Main body ECU (Multiplex network body ECU) Skid control ECU (Brake booster with master cylinder assembly) Rack and pinion power steering gear assembly	EPS warning light: Comes on	Assist Map Writing is performed	-

CAUTION / NOTICE / HINT

NOTICE:

If the rack and pinion power steering gear 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:

for Gasoline Model:

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

for HV Model:

Hybrid vehicle control ECU assembly
Main body ECU (Multiplex network body ECU)
Skid control ECU (Brake booster with master cylinder assembly)

PROCEDURE

1.	PERFORM ASSIST MAP WRITING

(a) Perform assist map writing.

Chassis > EMPS > Utility

Tester Display
Signal Check

(b) Check for DTCs.

Chassis > EMPS > Trouble Codes

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

END

2.	CHECK CAN COMMUNICATION SYSTEM

(a) Check for DTCs.

for Gasoline Model: Click here

for HV Model: Click here

Result	Proceed to
CAN communication system DTCs are not output. (for Gasoline Model)	A
CAN communication system DTCs are not output. (for HV Model)	B
CAN communication system DTCs are output.	C

GO TO STEP 7

GO TO CAN COMMUNICATION SYSTEM

for Gasoline Model: Click here

for HV Model: Click here

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)
Click here

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 (rack and pinion power steering gear 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 RACK AND PINION POWER STEERING GEAR 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)
Click here

6.	CHECK FOR DTC

(a) Check for DTCs.

Chassis > EMPS > Trouble Codes

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

END

REPLACE RACK AND PINION POWER STEERING GEAR ASSEMBLY

7.	CHECK RELATED PART

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

Related Part	Hybrid vehicle control ECU assembly
	Main body ECU (Multiplex network body ECU)
	Skid control ECU (Brake booster with master cylinder assembly)

NOTICE:

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

Hybrid vehicle control ECU assembly
Click here
Main body ECU (Multiplex network body ECU)
Click here
Skid control ECU (Brake booster with master cylinder assembly)
Click here

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

GO TO STEP 9

8.	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 (rack and pinion power steering gear 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 RACK AND PINION POWER STEERING GEAR ASSEMBLY

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

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

Hybrid vehicle control ECU assembly
Click here
Main body ECU (Multiplex network body ECU)
Click here
Skid control ECU (Brake booster with master cylinder assembly)
Click here

10.	CHECK FOR DTC

(a) Check for DTCs.

Chassis > EMPS > Trouble Codes

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

END

REPLACE RACK AND PINION POWER STEERING GEAR ASSEMBLY