Cherokee 4WD L6-242 4.0L VIN M FI (1988)
Neutral Safety Switch: Description and Operation
AW4
Neutral Safety Switch Location
This switch acts as a safety device so that voltage is not allowed to flow to the ECU unless the vehicle is in PARK or NEUTRAL otherwise the vehicle
could be started in gear.
This input switch is located on the shift lever of the automatic transmission. Its purpose is to inform the ECU when the vehicle has been shifted from
PARK or NEUTRAL into drive. This switch allows voltage to flow back to the ECU when the vehicle is in PARK or NEUTRAL, but not when the
vehicle is in DRIVE, LOW 1, or LOW 2. When the ECU receives this signal, it will adjust the idle speed stepper motor to compensate for the increased
engine load.
