Calais L4-151 2.5L VIN U TBI (1989)
Transmission Position Switch/Sensor: Testing and Inspection
Chart C-1A
Wiring Diagram For P/N Switch
CIRCUIT DESCRIPTION:
The PARK/NEUTRAL switch contacts are closed to ground in park or neutral and open in drive ranges. The ECM supplies ignition voltage through a
current limiting resistor to circuit 434, and senses a closed switch when the voltage on circuit 434 drops to less than one volt. The ECM uses the P/N
signal as one of the inputs to control idle air and vehicle speed sensor diagnostics.
TEST DESCRIPTION: The numbers below refer to circled numbers on the diagnostic chart.
