VARIABLE GEAR RATIO STEERING SYSTEM, Diagnostic DTC:C15A4/64, C15A9/66, C15AA/66, C15AB/66

DTC Code	DTC Name
C15A4/64	Motor Rotation Angle Malfunction
C15A9/66	Lock Holder Deviation Detection
C15AA/66	Lock Mechanism Release Incomplete
C15AB/66	Lock Mechanism Insertion

DESCRIPTION

When the VGRS system is normal, the steering actuator assembly conducts current from the VGRS ECU (front steering control ECU) to the steering actuator solenoid to release the lock mechanism, enabling motor operation.

The steering actuator assembly does not operate under any of the following conditions:

The power switch is off.
The motor in the actuator is locked by the lock mechanism to prevent rotation (fail-safe function).
The system is being protected from overheating (fail-safe function).

If the VGRS ECU (front steering control ECU) detects a malfunction in the steering actuator lock mechanism or a motor rotation angle error, it stores these DTCs.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Warning Indicate	Return-to-normal Condition
C15A4/64	Motor Rotation Angle Malfunction	After power switch is turned on (READY), the "Actuator Target Angle" and "Actuator Angle" have a difference of 0.5 degrees or more for 1 second or more.	Steering actuator assembly	Comes on	Power switch on (IG) again
C15A9/66	Lock Holder Deviation Detection	After the power switch is turned on (IG), the lock pin is inserted with the steering wheel near the neutral position (within 90 degrees of 0), the "Actuator Angle" and "Deep Groove Electrical Angle Position" are at 40 degrees or more.	Steering actuator assembly	Comes on	After clearing DTCs, perform actuator angle neutral point calibration.
C15AA/66	Lock Mechanism Release Incomplete	After power switch is turned on (READY),the "Motor q Axis Target Voltage" is 1.8 V or higher and 15 seconds or more elapse, or the "Motor q Axis Target Voltage" is 0.6 V or higher and 180 seconds or more elapse.	Steering actuator assembly	Comes on	After clearing DTCs, perform actuator angle neutral point calibration.
C15AB/66	Lock Mechanism Insertion	After the power switch is turned off, when the motor is operating to confirm the lock pin insertion, the "Motor q Axis Target Voltage" is below 2 V.	Steering actuator assembly	Comes on	After clearing DTCs, perform actuator angle neutral point calibration.

CAUTION / NOTICE / HINT

Note

When replacing the steering actuator assembly, perform actuator angle neutral point calibration and initialization after replacement.

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Since DTC C1B09/19 is stored in the DRS ECU (rear steering control ECU), after performing repairs on the VGRS system, clear the DTCs for the dynamic rear steering system.

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PROCEDURE

REPLACE STEERING ACTUATOR ASSEMBLY

Replace the steering actuator assembly.

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Result

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