Fault-Tracing

Fault tracing TCM-P086087

Checking communication with the gear selector module (GSM)




- Ignition on
- Gear selector in position P
- Check if communication with the gear selector module (GSM) functions by reading the status for the Winter program selector (W).
- Activate and deactivate the function by pressing the switch. The status must change.
The fault is permanent if the value does not change.
If the status switches it means that the fault was present previously but is not active now. There is an intermittent fault.









Continue - Checking the components and wiring

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Checking the components and wiring
Check connector (16 pin) for the transmission control module (TCM) and gear selector module (GSM). Check for contact resistance and oxidation.
Check the communication cable (IN) between the transmission control module (TCM) terminal #A7 and gear selector module (GSM) terminal #2. Check for an open-circuit.
Check the voltage supply cable between the transmission control module (TCM) terminal #A16 and the gear selector model (GSM) terminal #1. Check for an open circuit.

Hint: The gear selector module (GSM) is supplied with power by the transmission control module (TCM).

Check the ground cable between the gear selector module (GSM) terminal #6 and ground. Check for an open circuit. Check the ground terminal for the ground cable.
If no fault can be found in the cable and the fault remains try replacing the printed circuit board (gear selector module (GSM)).

Other information
- Connecting the breakout box, B8444S, TF-80SC AWD Connecting Breakout Box, Transmission Control Module (TCM)
- Signal description, B8444S, TF-80SC AWD Signal Description, Transmission Control Module (TCM)
- To access the connector/replace the printed circuit board: Top panel Geartronic, replacing, B8444S, TF-80SC AWD, B6324S, TF-80SC, B6324S, TF-80SC AWD
- Checking wiring and terminals Checking Wiring and Terminals









Continue - Verification

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Verification




Verification

Hint: After carrying out the repair, check that the fault has been remedied.








- Ignition off.
- Reinstall the connectors, components etc.
- Ignition on.
- Gear selector in position P.
- Check whether communication with the gear selector module (GSM) works by reading off the winter mode selector (W) status.
Connect and disconnect the function by pressing the switch. The status should change.





Does the status change?

Yes - Troubleshooting procedure complete

No - Fault-tracing information

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Fault-tracing information




Information

Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Do you want to exit fault-tracing?

Yes - Exit Fault-tracing

No - Attempt New Test

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Attempt New Test - Checking communication with the gear selector module (GSM)

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