C1581

POWER STEERING: ELECTRONIC POWER STEERING SYSTEM: C1581: Assist Map Number Un-Writing

DTC C1581 - Assist Map Number Un-Writing

DESCRIPTION

The power steering ECU assembly outputs this DTC when it determines that assist map is not written in the ECU.
HINT:
The assist map is data written in the power steering ECU assembly to control the degree of assistance. The assist map is selected based on the vehicle's specified communication data (designation and grade package information).





INSPECTION PROCEDURE

PROCEDURE

1. PERFORM ASSIST MAP WRITING
(a) Turn the engine switch on (IG), and wait for 30 seconds or more.
HINT:
Assist map is automatically written when approximately 30 seconds have elapsed after the engine switch is turned on (IG). DTC C1581 will be cleared after the assist map is written.
(b) Check for DTCs.
OK:
DTC C1581 is not output.
OK -- RETURN TO NORMAL
NG -- Continue to next step.
2. CHECK CAN COMMUNICATION SYSTEM
(a) Check for DTCs of the CAN communication system Diagnosis System.
OK:
DTCs are not output.
NG -- REPAIR CIRCUIT INDICATED BY OUTPUT CODE
OK -- Continue to next step.
3. CHECK MULTIPLEX COMMUNICATION SYSTEM
(a) Check for DTCs in the multiplex communication system Reading and Clearing Diagnostic Trouble Codes.
OK:
DTCs are not output.
NG -- REPAIR CIRCUIT INDICATED BY OUTPUT CODE
OK -- Continue to next step.
4. CHECK ECM
(a) Check if a qualified ECM is installed.
OK:
A qualified ECM is installed.
NOTICE:
Perform the RESET MEMORY (AT initialization) procedures if replacing the ECM Initialization for AA80E, A760E Automatic Transmission System for A760E, A760H Automatic Transmission System for A760H).

NG -- REPLACE ECM
OK -- Continue to next step.
5. CHECK NETWORK GATEWAY ECU
(a) Check if a qualified network gateway ECU is installed.
OK:
A qualified network gateway ECU is installed.
NOTICE:
If replacing the power steering ECU assembly, initialize the rotation angle sensor and calibrate the torque sensor zero point Electronic Power Steering System.

NG -- REPLACE NETWORK GATEWAY ECU
OK -- REPLACE POWER STEERING ECU ASSEMBLY