Skylark V6-3100 3.1L VIN M SFI (1996)
Transmission Position Switch/Sensor: Description and Operation
Valid Input Combinations
DESCRIPTION
The Transaxle Range Switch is part of the Transaxle Park/Neutral Position (PNP) switch mounted on the transaxle manual shaft. The 4 inputs from the
transaxle range switch indicate to the PCM which position is selected by the Transaxle selector lever. This information is used for transmission shift
control, ignition timing, EVAP canister purge, EGR and Idle Air Control (IAC) valve operation. The combination of the four transaxle range input states
determine the PCM commanded shift pattern.
The input voltage level at the PCM is high (B+) when the transaxle range switch is open and low when the switch is closed to ground. The state of each
input is represented on the scan tool as X=high voltage level, O=low voltage level. The four parameters represent transaxle range switch Parity, A, B,
and C inputs respectively.
