TCM Self-Diagnosis Does Not Activate

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 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 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.