Range Select Display INOP or Displays Incorrect Range (Diesel)

Range Selector Display Inoperative or Displays Incorrect Range (Diesel)












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.