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42RLE Automatic Transmission






P0765-UD SOLENOID CIRCUIT





For a complete wiring diagram refer to Diagrams/Electrical. Electrical Diagrams


Theory of Operation


Four solenoids are used to control the friction elements (clutches). The continuity of the solenoid circuits is periodically tested. Each solenoid is turned on or off depending on its current state. An inductive spike should be detected by the PCM during this test. If no spike is detected, the circuit is tested again to verify the failure. In addition to the periodic testing, the solenoid circuits are tested if a gear ratio or pressure switch error occurs. In this case, one failure will result in the appropriate DTC being set. The MIL will illuminate and the transmission goes into neutral, if the DTC is set above 35 km/h (22 mph), Limp-in mode when vehicle speed is below 35 km/h (22 mph).


- When Monitored:

Initially at ignition on, then every 10 seconds thereafter. The solenoids will also be tested immediately after a gear ratio error or pressure switch error is detected.

- Set Condition:

Three consecutive solenoid continuity test failures, or one failure if test is run in response to a gear ratio or pressure switch error.







Always perform the 42RLE Pre-Diagnostic Troubleshooting procedure before proceeding.



Diagnostic Test


1. DETERMINING IF RELATED TIPM TCM POWER CONTROL CIRCUIT DTCS PRESENT

With the scan tool, read TIPM DTCs.

Are there any TIPM TCM Power Control Circuit DTCs present also?

Yes

- Refer to the Transmission category and perform the appropriate symptom.

No

- Go To 2



2. CHECK IF THE DTC IS CURRENT

With the scan tool, view DTCs.

Is the status Active or is the STARTS SINCE SET counter set at 0 for this DTC?

Yes

- Go To 3

No

- Go To 8



3. CHECK THE PCM AND WIRING USING THE TRANSMISSION SIMULATOR

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.

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 during actuation?

Yes

- Go To 4

No

- Go To 5



4. CHECK WIRING USING THE TRANSMISSION SIMULATOR

With the scan tool, continue to actuate the UD Solenoid.

While monitoring the UD Solenoid LED on the Transmission Simulator, wiggle the related wiring harness and connectors.

Did the UD Solenoid LED on the Transmission Simulator continue to blink on and off during the wiggle test?

Yes

- Replace the Transmission Solenoid/Pressure Switch Assembly.
- Perform 42RLE TRANSMISSION VERIFICATION TEST - VER 1. Verification Tests

No

- Repair wiring or connectors as necessary.
- Perform 42RLE TRANSMISSION VERIFICATION TEST - VER 1. Verification Tests



5. CHECK THE (T59) UD SOLENOID CONTROL CIRCUIT FOR AN OPEN





Turn the ignition off to the lock position.

Disconnect the PCM C4 harness connector.

Disconnect the Transmission Solenoid/Pressure Switch Assembly 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 between the Solenoid/Pressure Switch Assembly harness connector and the appropriate terminal of Miller tool #8815.

Is the resistance above 5.0 ohms?

Yes

- Repair the (T59) UD Solenoid Control circuit for an open.
- Perform 42RLE TRANSMISSION VERIFICATION TEST - VER 1. Verification Tests

No

- Go To 6



6. CHECK THE (T59) UD SOLENOID CONTROL CIRCUIT FOR A SHORT TO GROUND





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

Is the resistance below 5.0 ohms?

Yes

- Repair the (T59) UD Solenoid Control circuit for a short to ground.
- Perform 42RLE TRANSMISSION VERIFICATION TEST - VER 1. Verification Tests

No

- Go To 7



7. CHECK THE (T59) UD SOLENOID CONTROL CIRCUIT FOR A SHORT TO VOLTAGE





Ignition on, engine not running.

With the scan tool under TIPM, actuate the Transmission.

Measure the voltage of the (T59) UD Solenoid Control circuit.

Is the voltage above 0.5 volts?

Yes

- Repair the (T59) UD Solenoid Control circuit for a short to voltage.
- Perform 42RLE TRANSMISSION VERIFICATION TEST - VER 1. Verification Tests

No

- 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. Check for Service Information Tune-ups or Service Bulletins for any possible causes that may apply. If no problems are found, replace the PCM. With the scan tool, perform QUICK LEARN.
- Perform 42RLE TRANSMISSION VERIFICATION TEST - VER 1. Verification Tests



8. 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

- Repair as necessary.
- Perform 42RLE TRANSMISSION VERIFICATION TEST - VER 1. Verification Tests

No

- Test Complete.
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