Jeep Cherokee

 Service Manual

Transmission and transfer case » Automatic transmission-30RH » Diagnosis and testing
Park/neutral position switch

The center terminal of the park/neutral position switch is the starter-circuit terminal. It provides the ground for the starter solenoid circuit through the selector lever in PARK and NEUTRAL positions only.

The outer terminals on the switch are for the backup lamp circuit.

SWITCH TEST

To test the switch, remove the wiring connector.

Test for continuity between the center terminal and the transmission case. Continuity should exist only when the transmission is in PARK or NEUTRAL.

Shift the transmission into REVERSE and test continuity at the switch outer terminals. Continuity should exist only when the transmission is in REVERSE. Continuity should not exist between the outer terminals and the case.

Check gearshift linkage adjustment before replacing a switch that tests faulty.

Automatic transmission diagnosis

Effects of incorrect fluid level

Causes of burnt fluid

Fluid contamination

Preliminary diagnosis

Park/neutral position switch

Gearshift cable

Throttle valve cable

Road testing

Analyzing road test

Hydraulic pressure test

Air testing transmission clutch and band operation

Converter housing fluid leak diagnosis

Diagnosis charts