Transmission Position Sensor/Switch: Description and Operation

Fig. 14 Park/Neutral Switch:

PURPOSE
The switch provides an input to the PCM to indicate whether the automatic transaxle is in Park/Neutral, or a drive gear selection. This input is used to determine idle speed (varying with gear selection), and ignition timing advance.

The park/neutral input is also used to cancel vehicle speed control.

The [1][2]park/neutral position switch is located on the automatic transaxle housing (Fig. 14). Manual transaxles do not use [1][2]park/neutral switches.

CIRCUIT OPERATION
When closed, the [1][2]PARK/NEUTRAL position switch provides a ground path on circuit T41 for the coil side of the starter motor relay. The case-grounded switch provides ground for circuit T41.

Circuit A41 from the ignition switch provides battery voltage to the coil side of the relay Circuit T41 connects to cavity 2 of the [1][2]PARK/NEUTRAL position switch connector.

Circuit T41 splices to cavity 50 of the Powertrain Control Module (PCM). The [1][2]PARK/NEUTRAL position switch provides an input to the PCM.

NOTE: The [1][2]park/neutral switch is sometimes referred to as the neutral safety switch.