C1581

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

DTC C1581 - Assist Map Number Un-Writing

DESCRIPTION

The power steering ECU outputs this DTC when it determines that the assist map is not written in the ECU.
HINT: The assist map data is written in the power steering ECU to control assisting power.
The assist map has 3 types. Select an assist map according to the vehicle country information that is recorded in the ECU.





INSPECTION PROCEDURE

PROCEDURE

1. PERFORM ASSIST MAP WRITING
(a) Turn the ignition switch on (IG).
(b) Connect Techstream to the DLC3.
HINT: At this time, check that the P/S warning light is illuminated.

(1) Select the signal check, and change to test mode.
(c) Wait for 3 seconds.
NEXT -- Continue to next step.
2. CHECK P/S WARNING LIGHT
(a) Check the P/S warning light.
Result:





HINT: If the P/S warning light blinks at 0.25 seconds intervals, the assist map adjustment has completed normally.

B -- END
A -- Continue to next step.
3. CHECK DTC
(a) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.
Result:





HINT: If DTC C1581 is output, turn the ignition switch off. Enter the test mode again. If the DTC is output 3 times in a row, replace the power steering ECU.

C -- PERFORM ASSIST MAP WRITING
B -- REFER TO CIRCUITS INDICATED BY OUTPUT DTCS
A -- REPLACE POWER STEERING ECU