Grand Prix V6-191 3.1L VIN M SFI (1998)
Transaxle Range (TR) Switch: Description and Operation
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 IAC valve operation.
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, 0=low voltage level. The four parameters represent transaxle range switch Parity, A, B, and 0 inputs respectively. Valid transaxle range
input combinations are shown in the Transaxle Range Switch Valid Input Combinations table.
