Procedure 21

21. TCM Self-diagnosis Does Not Activate [PNP & 3rd Position Switches and APP Sensor Circuit Checks]
SYMPTOM: A/T CHECK indicator lamp does not come on in TCM self-diagnostic procedure even if the lamp circuit is good.

DESCRIPTION











- Park/neutral position (PNP) switch
The park/neutral (PNP) switch assembly includes a transmission range switch. The transmission range switch detects the selector lever position and sends a signal to the TCM.
- 3rd position switch
Detects the 3rd position switch position and sends a signal to the TCM.
- Accelerator pedal position sensor
ECM judges throttle opening based on a signal from accelerator pedal position sensor, and sends the signal via CAN communication to TCM.
*: Accelerator pedal position sensor

DIAGNOSTIC PROCEDURE

NOTE: The diagnostic procedure includes inspections for the 3rd position switch and electric throttle control actuator (throttle position sensor) circuits





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