TCM Diagnosis Does Not Activate

21. TCM Self-diagnosis Does Not Activate [PNP & 3rd Position Switches, and APPS (TPS)* Circuit Checks]
SYMPTOM:A/T CHECK indicator lamp does not come on in TCM self-diagnostic procedure even if the lamp circuit is good.
*: Accelerator pedal position sensor (throttle position sensor)

DESCRIPTION





- Park/neutral position (PNP) switch
The park/neutral (PNP) switch 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 and sends a signal to the TCM.





- Accelerator pedal position sensor (throttle position sensor) ECM judges throttle opening based on a signal from accelerator pedal position sensor, and sends the signal via CAN communication to TCM.

DIAGNOSTIC PROCEDURE





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NOTE: The diagnostic procedure includes inspections for the 3rd position switch and accelerator pedal position sensor (throttle position sensor) circuits.