Grand Prix V6-3.1L VIN J (2000)
PRNDL Indicator
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 PCM
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. A closed circuit or switch indicates a low voltage signal. The PCM detects the
selected gear range by deciphering the combination of the voltage signals. The PCM compares the actual voltage combination of the switch signals to a
TR switch combination table stored in memory.
Change Oil Soon Indicator (Driver Information Display)
The PCM determines the amount of oil life from the various sensors and inputs within the engine control system. When the PCM determines that an oil
life of 0% is present, the PCM turns ON the change oil soon indicator by supplying ground.
