Circuit Description

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 required to set DTC are:

• System voltage is greater than 9 volts.
• TRS inputs indicate a gear position other than Park or Neutral during start-up.
• Listed conditions present longer than 3 consecutive start-ups.