DaimlerChrysler Jeep Grand Cherokee 2002, Service Manual

Page: 233 / 284

Symptom:
*CHECKING THE PARK NEUTRAL SWITCH SIGNAL
POSSIBLE CAUSES
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 ACTION APPLICABILITY
1 Turn the ignition on.
With the DRBIII
t
, read Transmission DTCs.
Are any TCM DTCs present?
All
Yes
→
Refer to the Transmission Diagnostics Information for related
symptom(s).
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Go To 2
2 Turn the ignition off.
Disconnect the TCM harness connector.
Turn the ignition on.
With the DRBIII
t
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?
All
Yes
→
Test Complete.
No
→
Go To 3
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? All
Yes
→
Repair the Park/Neutral Switch Sense circuit for a short to
voltage.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Go To 4
225
DRIVEABILITY - DIESEL
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