Symptom:
*CHECKING PARK/NEUTRAL SWITCH OPERATION
POSSIBLE CAUSES
P/N POSITION SWITCH SENSE CIRCUIT OPEN
P/N POSITION SWITCH SENSE CIRCUIT SHORT TO GROUND
TRANSMISSION RANGE SENSOR
POWERTRAIN CONTROL MODULE
TEST ACTION APPLICABILITY
1 Ignition on, engine not running.
With the DRBIIIt, monitor the Park/Neutral Position Switch input state.
Move the gear selector through all gear positions, Park to 1 and back to Park.
Did the DRBIIIt display show P/N and D/R in the correct gear positions?
All
Yes → Test Complete.
No → Go To 2
2 Turn the ignition off to the lock position.
Disconnect the PCM harness connectors.
Disconnect the TRS harness connector.
Note: Check connectors - Clean/repair as necessary.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Measure the resistance of the P/N Position Switch Sense circuit from the appropriate
terminal of special tool #8815 to the Transmission Range Sensor harness connector.
Is the resistance below 5.0 ohms?
All
Yes → Go To 3
No → Repair the P/N Position Switch Sense circuit for an open.
3 Turn the ignition off to the lock position.
Disconnect the PCM harness connectors.
Disconnect the TRS harness connector.
Note: Check connectors - Clean/repair as necessary.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Measure the resistance between ground and the P/N Position Switch Sense circuit.
Is the resistance above 100 kohms?
All
Yes → Go To 4
No → Repair the P/N Position Switch Sense circuit for a short to ground.
171
TRANSMISSION - NGC
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