Park/Neutral Position Switch Circuit

PARK/NEUTRAL POSITION SWITCH CIRCUIT (ONLY VEHICLES WITH A/T)

Circuit Description

The park/neutral position switch goes on when the shift lever is in the N or P shift position. When it goes on the terminal NSW of the ECM is grounded to body ground via the starter relay and theft deterrent and door lock control ECU thus the terminal NSW voltage becomes OV. When the shift lever is in the D, 2, L or R position, the park/neutral position switch goes off, so the voltage of ECM terminal NSW becomes battery positive voltage, the voltage of the ECM internal power source.

If the shift never is moved from the N position to the D position, this signal is used for air-fuel ratio correction, for idle speed control (estimated control), etc.

When the park/neutral position switch is off, code "51" is output in the test-mode diagnosis. (This is not abnormal.)




Diagnostic Chart

NOTE: This diagnosis chart is based on the premise that the engine is cranked normally. If the engine is not cranked, proceed to the matrix chart of problem symptoms Symptom Related Diagnostic Procedures.




Wiring Diagram

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Inspection Procedure