C1581

POWER ASSIST SYSTEMS: 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.






INSPECTION PROCEDURE
NOTE: If the steering column or power steering ECU is replaced, perform rotation angle sensor initialization and torque sensor zero point calibration Programming and Relearning.

PROCEDURE

1. PERFORM ASSIST MAP WRITING
(a) Turn the ignition switch off.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to ON.
(d) Turn the Techstream on.
(e) Enter the following menus: Chassis / EMPS / Utility / Signal Check. Switch the power steering system to the test mode by following the display on the Techstream.
(f) Wait for 1 second or more.
(g) Turn the ignition switch off.
(h) Turn the ignition switch to ON.
(i) Check for DTCs.
HINT: Approximately 1 second after switching the test mode, assist map writing is automatically performed. After the automatic assist map writing, DTC C1581 is cleared.

OK:
DTC C1581 is not output.
NG -- CHECK DTC (CAN COMMUNICATION SYSTEM)
OK -- END (COMPLETION OF ASSIST MAP WRITING RETURNS SYSTEM TO NORMAL)
2. CHECK DTC (CAN COMMUNICATION SYSTEM)
(a) Check for DTCs.
OK:
DTC is not output.
NG -- GO TO CAN COMMUNICATION SYSTEM
OK -- REPLACE POWER STEERING ECU