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) RELATED TRANSMISSION RELAY DTC'S PRESENT
With the scan tool, check for other transmission DTC's.

Are there any Transmission Control Relay DTC's present?

Yes
1. Refer to the Transmission category and perform the appropriate symptom.
2. Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1 .
No
1. Go To step 2).
2) CHECK TO SEE IF P0765 IS PRESENT
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 Transmission Simulator, Miller tool #8333.

NOTE: Check connectors - Clean/repair as necessary.

Ignition on, engine not running.

With the scan tool, actuate the UD Solenoid.

Monitor the UD Solenoid LED on the Transmission Simulator.

Did the UD Solenoid LED on the Transmission Simulator blink on and off?

Yes
1. Go To step 3).
No
1. Go To step 4).
3) TRANSMISSION SOLENOID/TRS ASSEMBLY
With the scan tool, continue to actuate the UD Solenoid for the period of 2 minutes with the Transmission Simulator still connected.

After 2 minutes of actuation, with the scan tool, stop the actuation and check for transmission DTCs.

Did the DTC P0765 reset during the actuation test?

Yes
1. Go To step 4).
No
1. Replace the Transmission Solenoid/TRS Assembly per the Service Information.
2. Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1 .
4) (T59) UD SOLENOID CONTROL CIRCUIT SHORT TO OTHER CIRCUITS

Fig 1: Checking UD Solenoid Control Circuit for Short to Other Circuits
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off to the lock position.

Disconnect the Transmission Simulator, Miller tool #8333.

Disconnect the PCM harness connectors.

Measure the resistance between the (T59) UD Solenoid Control circuit and all other circuits in the Transmission Solenoid/TRS Assembly harness connector.

Is the resistance below 5.0 ohms between the (T59) UD Solenoid Control circuit and any other circuit(s) in the Transmission Solenoid/TRS Assembly harness connector?

Yes
1. Repair the (T59) UD Solenoid Control circuit for a short to other circuit(s).
2. Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1 .
No
1. Go To step 5).
5) (T59) UD SOLENOID CONTROL CIRCUIT OPEN

Fig 2: Checking UD Solenoid Control Circuit for Open
Courtesy of DAIMLERCHRYSLER CORP.

Connect Miller tool #8815 to the PCM C4 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 tool #8815 to perform diagnosis.

Measure the resistance of the (T59) UD Solenoid Control circuit from the Transmission Solenoid/TRS Assembly harness connector to the appropriate terminal of Miller tool #8815.

Is the resistance above 5.0 ohms?

Yes
1. Repair the (T59) UD Solenoid Control circuit for an open.
2. Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1 .
No
1. Go To step 6).
6) (T59) UD SOLENOID CONTROL CIRCUIT SHORT TO GROUND

Fig 3: Checking UD Solenoid Control Circuit for Short to Ground
Courtesy of DAIMLERCHRYSLER CORP.

Measure the resistance between ground and the (T59) UD Solenoid Control circuit.

Is the resistance below 5.0 ohms?

Yes
1. Repair the (T59) UD Solenoid Control circuit for a short to ground.
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 .