6000 V6-173 2.8L (1988)
Transmission Position Switch/Sensor: Description and Operation
PURPOSE
The Park/Neutral (P/N) switch indicates to the Electronic Control Module (ECM) when the transmission is in Park, Neutral or Drive. This
information is used for the Torque Converter Clutch (TCC), Exhaust Gas Recirculation (EGR) and the Idle Air Control (IAC) valve operation.
OPERATION
The park/neutral switch contacts are a part of the neutral start switch and are closed to ground in park or neutral, and open in drive ranges. The
ECM supplies ignition voltage through a current limiting resistor to CKT 434 and senses a closed switch when the voltage on CKT 434 drops to
less than one volt.
CAUTION: Vehicle should not be driven with park/neutral switch disconnected, as idle quality will be affected and a possible false Code 24
Vehicle speed Sensor (VSS).
Refer to Refer to System Diagnosis / C-charts Component Testing / Chart C-1A for P/N Switch Diagnosis.
