Grand Prix V6-191 3.1L (1989)
Transmission Position Switch/Sensor: Testing and Inspection
Chart C-1A
Chart C-1A Wiring Diagram
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 CKT 434 and senses a closed switch, when the voltage on CKT 434 drops to
less than one volt.
The ECM uses the P/N signal as one of the inputs to control:
^
Idle Air Control
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VSS Diagnostics
^
EGR
