3000GT V6-3.0L SOHC (1998)
Transmission Position Switch/Sensor: Testing and Inspection
inspection and troubleshooting hints
OPERATION
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The ignition switch-ST inputs a high signal to the engine control module while the engine is cranking. The engine control module provides fuel
injection control, etc., at engine start-up based on this signal.
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When the ignition switch is set to START, the battery voltage at cranking is applied through the ignition switch and park-neutral position switch to
the engine control module, which detects that the engine is cranking.
In case the selector lever is in a position other than the P/N range, the battery voltage is not applied to the engine control module.
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The park/neutral position switch converts the selector lever position (whether it is at the P/N range or at others) into high/low voltage and inputs it
to the engine control module, which then controls the idle air control motor based on this signal.
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The battery voltage in the engine control module is applied through a resistor to the park/neutral position switch. When the selector lever is set to
the P/N range, continuity is produced between the park/neutral position switch terminal of the engine control module and ground through the
starter motor, thereby making the terminal voltage go low.
TROUBLESHOOTING HINTS
If the park/neutral position switch harness and individual part checked good but the park/neutral position switch output is abnormal, poorly
adjusted control cable is suspected.
INSPECTION
Using Scan Tool
IGNITION SWITCH-ST