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) CHECK TO SEE IF DTC IS CURRENT
With the scan tool, Check the STARTS SINCE SET counter for P0935.

NOTE: This counter only applies to the last DTC set.

Is the STARTS SINCE SET counter 2 or less?

Yes
1. Go To step 2).
No
1. Go To step 6).
2) PCM AND WIRING
Turn the ignition off to the lock position.

Remove the Starter Relay.

NOTE: Removal of the Starter Relay is to prevent a Transmission, NO RESPONSE, condition and disable the starter.

Install the Transmission Simulator, Miller tool #8333.

NOTE: Check connectors - Clean/repair as necessary.

Ignition on, engine not running.

With the scan tool, monitor the Line Pressure.

Using the Transmission Simulator, set the rotary switch to each of the 3 line pressure positions.

NOTE: The readings should be within +/-14 kPa or 2.0 PSI on the scan tool of the pressure reading specified on Transmission Simulator.

Does the 3 line pressures on the scan tool match the Line pressure readings on the Transmission Simulator?

Yes
1. Replace the Line Pressure Sensor per the Service Information.
2. Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1 .
No
1. Go To step 3).
3) (K900) SENSOR GROUND CIRCUIT OPEN

Fig 1: Checking Sensor Ground Circuit for Open
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off to the lock position.

Disconnect the Transmission Simulator, Miller tool #8333.

Disconnect the PCM C2 harness connector and connect Miller tool #8815.

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 tool #8815 to perform diagnosis.

Measure the resistance of the (K900) Sensor Ground circuit from the Line Pressure Sensor harness connector to the appropriate terminal of Miller tool #8815.

Is the resistance above 5.0 ohms?

Yes
1. Repair the (K900) Sensor Ground circuit for an open.
2. Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1 .
No
1. Go To step 4).
4) (T38) LINE PRESSURE SENSOR SIGNAL CIRCUIT OPEN

Fig 2: Checking Line Pressure Sensor Signal Circuit for Open
Courtesy of DAIMLERCHRYSLER CORP.

Disconnect the PCM C4 harness connector and connect Miller tool #8815.

Measure the resistance of the (T38) Line Pressure Sensor Signal circuit from the Line Pressure Sensor harness connector to the appropriate terminal of Miller tool #8815.

Is the resistance above 5.0 ohms?

Yes
1. Repair the (T38) Line Pressure Sensor Signal circuit for an open.
2. Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1 .
No
1. Go To step 5).
5) (T38) LINE PRESSURE SENSOR SIGNAL CIRCUIT SHORT TO VOLTAGE

Fig 3: Checking Line Pressure Sensor Signal Circuit for Short to Voltage
Courtesy of DAIMLERCHRYSLER CORP.

Remove the Transmission Control Relay.

Connect a jumper wire between the (A104) Fused B+ circuit and the (T16) Transmission Control Relay Output circuit in the Transmission Control Relay connector.

Ignition on, engine not running.

Measure the voltage of the (T38) Line Pressure Sensor Signal circuit.

Is the voltage above 5.5 volts?

Yes
1. Repair the (T38) Line Pressure Sensor Signal circuit for a short to voltage.
2. Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1 .
No
1. Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the PCM per the Service Information. With the scan tool, perform QUICK LEARN.
2. Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1 .
6) INTERMITTENT WIRING AND CONNECTORS
The conditions necessary to set this DTC are not present at this time.

Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.

Wiggle the wires while checking for shorted and open circuits.

With the scan tool, check the EATX DTC EVENT DATA to help identify the conditions in which the DTC was set.

Where there any problems found?

Yes
1. Repair as necessary.
2. Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1 .
No
1. Test Complete.