DTC P179F-00: Gear Shift Actuator "B" Performance [11/2021 - ]: Description

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The shift control actuator assembly consists of a shift actuator ECU, motor, motor rotation angle sensor and output shaft rotation angle sensor. The shift control actuator assembly operates the motor in accordance with the operation signal from the shift control ECU to change the shift state between P, R, N and D.

The motor rotation sensor detects the motor angle and optimizes the motor speed and current.

The output shaft rotation angle sensor determines the shift state based on the sensor angle and transmits the state to the shift control ECU.

If the shift actuator ECU determines that the motor is malfunctioning or the detected motor rotation angle or output angle is not correct, the ECM stores a DTC.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Warning Indicate	DTC Output from	Priority	Note
P179F-00	Gear Shift Actuator "B" Performance	Either of the following is met: The gear shift motor did not rotate to the specified position. There is a discrepancy between the target shift position requested by the shift control ECU and the position judged by the shift actuator ECU. (1 trip detection logic)	Loosen or proof contact of battery terminal Shift control actuator assembly (Shift actuator ECU) Automatic transaxle assembly Wire harness or connector	Does not come on	Multi-information Display Error Message Displayed	Transmission	B	SAE: P179F