Transmission Position Sensor/Switch: Testing and Inspection

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When the ignition switch is in the ST position, the battery voltage is applied through the ignition switch and inhibitor switch to the ECM. If the selector lever is not in P or N position, the battery voltage will not reach the ECM.

Based on this signal, the ECM determines the automatic transaxle load and drives the idle speed control actuator to maintain optimum idle speed.

Circuit Diagram:

Harness Inspection (Step 1 - 2):

TROUBLESHOOTING HINTS
If the park/neutral position switch harness check is normal but the park/neutral position switch output is abnormal, check the control cable adjustment.