Diagnostic Test

WARNING: This page is about a different variant/trim than selected.

1) CHECKING FOR LOSS OF PRIME DTC
With the scan tool, check for other Transmission DTCs.

Is the DTC P0944 present also?

Yes
1. Refer to DIAGNOSTIC CODE INDEX and perform the appropriate diagnostic procedure(s).
No
1. Go To step 2).
2) CHECK FOR RELATED TRANSMISSION DTCS
With the scan tool, read Transmission DTCs.

Are any of the DTCs P0732, P0734 and/or P0846 present also?

Yes
1. Replace the Transmission Solenoid/Pressure Switch Assembly per the Service Information.
2. Perform 40/41 TE TRANSMISSION VERIFICATION TEST - VER 1 .
No
1. Go To step 3).
3) CHECK TO SEE IF DTC P0845 IS CURRENT
With the scan tool, view DTCs.

Is the status Active for this DTC or is the STARTS SINCE SET counter 2 or less?

Yes
1. Go To step 4).
No
1. Go To step 11).
4) PCM AND WIRING
Turn the ignition off to the lock position.

Remove the Ignition Switch Feed fuse from the TIPM.

CAUTION: Removal of the Ignition Switch Feed fuse from the TIPM will prevent the vehicle from being started in gear.

WARNING: The Ignition Switch Feed fuse must be removed from the TIPM. Failure to do so can result in personal injury or death.

Install the Transmission Simulator, Miller tool #8333 and the Electronic Transmission Adapter kit 8333-1A.

NOTE: Check connectors - Clean/repair as necessary.

Ignition on, engine not running.

With the Transmission Simulator, turn the Pressure Switch selector switch to 2/4.

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

Wiggle the wires leading to the PCM while pressing and holding the Pressure Switch Test button.

Did the 2/4 Pressure Switch state change to closed and remain closed while wiggling the wires?

Yes
1. Go To step 5).
No
1. Go To step 6).
5) INTERNAL TRANSMISSION
If there are no possible causes remaining, view repair.

Repair
1. Disassemble and inspect the Valve Body per the Service Information and repair or replace as necessary. If no problems are found in the Valve Body, replace the Transmission Solenoid/Pressure Switch Assembly.
2. Perform 40/41 TE TRANSMISSION VERIFICATION TEST - VER 1 .
6) (T47) 2/4 PRESSURE SWITCH SENSE CIRCUIT OPEN

Fig 1: Checking 2/4 Pressure Switch Sense Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off to the lock position.

Disconnect the PCM C4 harness connector.

Disconnect the Transmission Solenoid/Pressure Switch Assembly harness connector.

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 Special Tool #8815 to perform diagnosis.

Measure the resistance of the (T47) 2/4 Pressure Switch Sense circuit from the appropriate terminal of special tool #8815 to the Transmission Solenoid/Pressure Switch Assembly harness connector.

Is the resistance above 5.0 ohms?

Yes
1. Repair the (T47) 2/4 Pressure Switch Sense circuit for an open.
2. Perform 40/41 TE TRANSMISSION VERIFICATION TEST - VER 1 .
No
1. Go To step 7).
7) (T47) 2/4 PRESSURE SWITCH SENSE CIRCUIT SHORT TO GROUND

Fig 2: Checking 2/4 Pressure Switch Sense Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Measure the resistance between ground and the (T47) 2/4 Pressure Switch Sense circuit.

Is the resistance below 5.0 ohms?

Yes
1. Repair the (T47) 2/4 Pressure Switch Sense circuit for a short to ground.
2. Perform 40/41 TE TRANSMISSION VERIFICATION TEST - VER 1 .
No
1. Go To step 8).
8) (T47) 2/4 PRESSURE SWITCH SENSE CIRCUIT SHORT TO VOLTAGE

Fig 3: Checking 2/4 Pressure Switch Sense Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Ignition on, engine not running.

With the scan tool in the TIPM, actuate the TCM output.

Measure the voltage of the (T47) 2/4 Pressure Switch Sense circuit.

Is the voltage above 0.5 volts?

Yes
1. Repair the (T47) 2/4 Pressure Switch Sense circuit for a short to voltage.
2. Perform 40/41 TE TRANSMISSION VERIFICATION TEST - VER 1 .
No
1. Go To step 9).
9) TRANSMISSION CONTROL OUTPUT CIRCUIT OPEN

Fig 4: Checking Transmission Control Circuit
Courtesy of DAIMLERCHRYSLER CORP.

While still actuating the TCM output in the TIPM and using a 12-volt test light connected to ground, check (T16) Transmission Control Output circuit in the Transmission Solenoid/Pressure Switch Assembly harness connector.

NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.

Does the test light illuminate brightly?

Yes
1. Go To step 10).
No
1. Repair the Transmission Control Output circuit for an open or high resistance. If the fuse is open make sure to check for a short to ground.
2. Perform 40/41 TE TRANSMISSION VERIFICATION TEST - VER 1 .
10) POWERTRAIN CONTROL MODULE
Using the schematics as a guide, inspect the wiring and connectors. Repair as necessary. Pay particular attention to all power and ground circuits.

If there are no possible causes remaining, view repair.

Repair
1. Replace the Powertrain Control Module per the Service Information. With the scan tool perform QUICK LEARN.
2. Perform 40/41 TE TRANSMISSION VERIFICATION TEST - VER 1 .
11) INTERMITTENT WIRING AND CONNECTORS
The conditions necessary to set the 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 DTC EVENT DATA to help identify the conditions in which the DTC was set.

Were there any problems found?

Yes
1. Repair as necessary.
2. Perform 40/41 TE TRANSMISSION VERIFICATION TEST - VER 1 .
No
1. Test Complete.