Circuit Description

WARNING: This page is about a different car, the 1998 Pontiac Trans Sport, 1998 Oldsmobile Silhouette, and 1998 Chevrolet Venture. However, it is still accessible from the selected car via links, so may be relevant.

Transaxle Range Switch (TRS) is part of Park/Neutral Position (PNP) switch. Inputs from TRS indicate to PCM which position is selected by gear selector lever. PCM uses this information for ignition timing, EVAP canister purge, EGR and IAC valve operation.

Combination of 4 TRS input states determine PCM commanded shift pattern. Input voltage level at PCM is high when TRS is open, and low when TRS is closed. If PCM detects engine start-up in any gear other than Park or Neutral, DTC P0706 is set.

Conditions for setting DTC:

System voltage is greater than 9 volts.
TRS inputs indicate a gear position other than Park or Neutral during start-up.
Conditions present for longer than 5 consecutive start-ups.