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Symptom:
*CHECKING THE PARK NEUTRAL SWITCH SIGNAL
CHECK FOR TRANSMISSION CONTROL MODULE DTCS
ENGINE CONTROL MODULE
P/N SENSE CIRCUIT SHORTED TO VOLTAGE
P/N SWITCH SENSE CIRCUIT OPEN
P/N SWITCH SENSE CIRCUIT SHORTED TO GROUND
TEST
1
Turn the ignition on.
With the DRBIII , read Transmission DTCs.
Are any TCM DTCs present?
Yes → Refer to the Transmission Diagnostics Information for related
→ Go To 2
No
2
Turn the ignition off.
Disconnect the TCM harness connector.
Turn the ignition on.
With the DRBIII in Engine Inputs/Outputs, read the P/N Switch state.
Connect one end of a fused jumper wire to the P/N Switch Sense circuit at the TCM
harness connector. Connect the other end of the jumper to ground for 10 seconds then
disconnect from ground.
Does the DRB Switch state change when connecting and disconnecting from ground?
Yes → Test Complete.
→ Go To 3
No
3
Turn the ignition off.
Disconnect the TCM harness connector.
Disconnect the ECM harness connectors.
Remove the ASD Relay from the PDC.
Connect a jumper wire between cavities 30 and 87 in the ASD connector in the PDC.
Turn the ignition on.
Measure the voltage of the P/N Switch Sense circuit.
Is the voltage above 1.0 volt?
Yes → Repair the Park/Neutral Switch Sense circuit for a short to
→ Go To 4
No
POSSIBLE CAUSES
ACTION
symptom(s).
Perform ROAD TEST VERIFICATION - VER-2.
voltage.
Perform ROAD TEST VERIFICATION - VER-2.
DRIVEABILITY - DIESEL
225
APPLICABILITY
All
All
All
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