Fiero L4-151 2.5L (1985)
Transmission Position Switch/Sensor: Testing and Inspection
Fig. 002 - Wiring Diagram for Chart C-1A Park/Neutral Switch. VIN 0, VIN 2, VIN R, VIN U
CHART C-1A,
PARK/NEUTRAL SWITCH
1.8L "J" SERIES
2.5L "A, X, & N" SERIES
The Park/Neutral Switch contacts are a part of the Neutral Start switch and 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;
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Idle Air Control (IAC)
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VSS Diagnostics