Park/Neutral Position Switch Circuit (Only vehicles with
ELECTRONIC CONTROLLED TRANSMISSION)
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 PNP of the ECM is grounded to body ground via the starter relay and theft deterrent ECU, thus the
terminal PNP voltage becomes O V. 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 PNP becomes battery voltage, the voltage of the ECM internal
power source.
If the shift lever is moved from the N position to the D position, this signal is used for air–fuel ratio correction
and 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 abnor-
mal.)
HINT: This diagnosis chart is based on premise that the engine is cranked normally. If the engine is not cranked,
proceed to the matrix chart of problem symptoms on page EG–344.
(See page EG–344).
(See page AX–90).
EG–416
–ENGINE TROUBLESHOOTING CIRCUIT INSPECTION
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