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) DETERMINING IF RELATED DTC'S ARE PRESENT
With the scan tool, check for other transmission DTC's

Is the DTC P0841 present also?

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 DTC P1776 IS CURRENT
With the scan tool, Check the STARTS SINCE SET counter.

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

Is the STARTS SINCE SET counter 2 or less?

Yes
1. Go To step 3).
No
1. Go To step 7).
3) 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 Transmission Simulator, turn the Pressure Switch selector switch to the LR position.

With the scan tool, monitor the LR Pressure Switch state while pressing the Pressure Switch Test button on the Transmission Simulator.

Did the state of the LR Pressure Switch change while pressing the Pressure Switch Test button?

Yes
1. Go To step 4).
No
1. Go To step 5).
4) SOLENOID SWITCH VALVE
Remove the Valve Body per the Service Information.

Inspect the Solenoid Switch Valve and plugs for sticking in the bore and/or wear.

Were there any problems found?

Yes
1. Clean and repair as necessary per the Service Information.
2. Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1 .
No
1. Go To step 7).
5) LR PRESSURE SWITCH SENSE CIRCUIT OPEN

Fig 1: Checking LR Pressure Switch Sense 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 C4 harness connector and connect Miller tool #8815.

NOTE: Note: Check connectors - Clean/repair as necessary.

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 (T50) LR Pressure Switch Sense circuit between the appropriate terminal of Miller tool #8815 to the Solenoid/TRS Assembly harness connector.

Is the resistance above 5.0 ohms?

Yes
1. Repair the (T50) LR Pressure Switch Sense circuit for an open.
2. Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1 .
No
1. Go To step 6).
6) (T50) LR PRESSURE SWITCH SENSE CIRCUIT SHORT TO GROUND

Fig 2: Checking LR Pressure Switch Sense Circuit for Short to Ground
Courtesy of DAIMLERCHRYSLER CORP.

Measure the resistance between ground and the (T50) LR Pressure Switch Sense circuit.

Is the resistance below 5.0 ohms?

Yes
1. Repair the (T50) LR Pressure Switch Sense 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 .
7) 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.

This DTC can also be set by the Solenoid Switch Valve intermittently sticking in it's bore under extreme temperature conditions, or by a worn Solenoid Switch Valve or plugs.

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.