POWER ASSIST SYSTEMS: POWER STEERING SYSTEM: C1581; Assist Map Number Un-Writing; 2017 - 2020 MY Sienna [08/2016

Last Modified: 04-05-2023	6.11:8.1.0	Doc ID: RM100000000ZY3K
Model Year Start: 2017	Model: Sienna	Prod Date Range: [08/2016 - ]
Title: POWER ASSIST SYSTEMS: POWER STEERING SYSTEM: C1581; Assist Map Number Un-Writing; 2017 - 2020 MY Sienna [08/2016 - ]

DTC

C1581

Assist Map Number Un-Writing

DESCRIPTION

When a map is not recorded in the steering column assembly (power steering ECU), then this DTC is stored.

DTC No.	DTC Detection Condition	Trouble Area
C1581	Assist map not written in power steering ECU	Assist map is not written CAN communication system SFI system Vehicle stability control system Steering column assembly

NOTICE:

When the steering column assembly is replaced, perform the assist map writing (See page ).

1.	PERFORM ASSIST MAP WRITING

(a) Perform the assist map writing (See page ).

2.	CHECK DTC OUTPUT

(a) Check for DTCs (See page ).

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

END

3.	CHECK CAN COMMUNICATION SYSTEM

(a) Check for DTCs of the CAN communication system (See page ).

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

GO TO CAN COMMUNICATION SYSTEM

(See page )

CHECK ECM

(a) Check that the correct ECM is installed.

OK:

The correct ECM is installed.

5.	CHECK SFI SYSTEM

(a) Check for DTCs of the SFI system (See page ).

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

6.	CHECK BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU)

(a) Check that the correct brake actuator assembly (skid control ECU) is installed.

OK:

The correct brake actuator assembly (skid control ECU) is installed.

REPLACE BRAKE ACTUATOR ASSEMBLY

(See page )

7.	CHECK VEHICLE STABILITY CONTROL SYSTEM

(a) Check the vehicle stability control system (See page ).

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

GO TO VEHICLE STABILITY CONTROL SYSTEM

(See page )