DTC C1581: Assist Map Number Un-Writing [12/2019 - 11/2023]: 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 Main body ECU (Multiplex network body ECU) No. 2 skid control ECU (Brake actuator assembly) Rack and pinion power steering gear assembly	EPS warning light: Comes on	Assist Map Writing is performed	-

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
Main body ECU (Multiplex network body ECU)
No. 2 skid control ECU (Brake actuator assembly)
Rack and pinion power steering gear assembly

EPS warning light: Comes on

Assist Map Writing is performed