Range Selector Display Inoperative or Displays Incorrect Range

Range Selector Display Inoperative or Displays Incorrect Range












Circuit Description
The Transmission Range (TR) switch is part of the Park/Neutral Position (PNP) and back-up lamp switch assembly, which is externally mounted on the transmission manual shaft. The TR switch contains four internal switches that indicate the transmission gear range selector lever position. The IPC supplies ignition voltage to each switch circuit. As the gear range selector lever is moved, the state of each switch may change, causing the circuit to open or close. An open circuit or switch indicates a high voltage signal in the IPC. A closed circuit or switch indicates a low voltage signal in the IPC. The IPC detects the selected gear range by deciphering the combination of voltage signals.

Diagnostic Aids
If all of the PRNDL indicators are inaccurate, ensure that the park neutral position switch is properly adjusted.

Transmission Fluid Checking Procedure
1. Start the engine and operate the vehicle for 15 minutes or until the transmission fluid reaches an operating temperature of 82 - 93C (180 - 200°F).
2. Park the vehicle on a level surface.
3. With your foot on the brake, move the shift lever through each gear range. Pause for about three seconds in each range, ending in Park.
4. Apply the parking brake and let the engine idle for three minutes.
5. Remove the transmission fluid level indicator. Wipe the indicator clean. Reinsert the indicator. Give the indicator a full twist in order to close.
6. Wait three seconds and remove the indicator.
7. Read both sides of the indicator. The fluid must be within the hot cross-hatched area using the lowest level reading.