Diagnostic Test

WARNING: This page is about a different car, the 2005 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

1) P/N & D/R NOT IN CORRECT POSITION
NOTE: Check the TCM for DTCs, if P0706 is set in the TCM diagnose the TCM code before continuing.

Ignition on, engine not running.

With the scan tool, read the Park/Neutral Position Switch input state.

While moving the gear selector through all gear positions (Park to 1 and back to Park), monitor the scan tool display.

Did the scan tool display show P/N and D/R in the correct gear positions?

Yes
1. Refer to INTERMITTENT CONDITION .
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go To step 2).
2) TRS (T41) SENSE (P/N SENSE) CIRCUIT OPEN

Fig 1: Checking Transmission Range Sensor Sense (P/N Sense) Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Disconnect the C3 PCM harness connector.

Disconnect the Transmission Range Sensor harness connector.

CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.

Measure the resistance of the TRS (T41) Sense (P/N Sense) circuit from the TRS harness connector to the appropriate terminal of special tool #8815.

Is the resistance below 5.0 ohms?

Yes
1. Go To step 3).
No
1. Repair the open in the TRS (T41) Sense (P/N Sense) circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
3) TRS (T41) SIGNAL CIRCUIT SHORTED TO GROUND

Fig 2: Checking Transmission Range Sensor Sense (P/N Sense) Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Measure the resistance between ground and the TRS (T41) Sense (P/N Sense) circuit at the TRS harness connector.

Is the resistance above 100k ohms?

Yes
1. Go To step 4).
No
1. Repair the short to ground in the TRS (T41) Sense (P/N Sense) circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
4) TRANSMISSION RANGE SENSOR

Fig 3: Checking Transmission Range Sensor
Courtesy of DAIMLERCHRYSLER CORP.

Measure the resistance between ground and the (T41) TRS Sense (P/N Sense) circuit while moving the gear selector through each gear in the TRS connector.

NOTE: The circuit is grounded in Park and Neutral and open in the other positions.

Did the resistance change from above 100 kohms (open) to below 10.0 ohms (grounded)?

Yes
1. Go To step 5).
No
1. Replace the Transmission Range Sensor.
2. Perform POWERTRAIN VERIFICATION TEST .
5) PCM
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

Were there any problems found?

Yes
1. Repair as necessary.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Replace and program the Powertrain Control Module per Service Information.
2. Perform POWERTRAIN VERIFICATION TEST .