Signal Too Low. Permanent Fault

Signal too low. Permanent fault

Checking line pressure solenoid SLS








- Ignition off
- Check the control module connector and automatic transmission connector D. Check for contact resistance and oxidation. See Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Remedy if necessary
- Reinstall the components, reconnect the connectors etc.
- Ignition on
- Activate solenoid SLS.
Read off the current through the solenoid SLS circuit.
The current should oscillate between 0 and 1000 mA.

Other information:
- To disconnect the transmission connectors, see Connectors transmission, disconnecting / connecting Procedures
- To disconnect the control module, see Transmission control module (TCM), replacing, B5244T5, AW55-50/51SN, B5254T2, AW55-50/51SN, B5254T2, AW50/51 AWD Service and Repair
- For information about signals, see Signal description. Transmission control module (TCM), AW50/51 AWD, AW55-50/51SN Signal Description. Transmission Control Module (TCM).





Does the current oscillate?

Yes - Fault Found

No - Checking resistance

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Checking resistance








- Ignition off
- Disconnect transmission connector D.
Check solenoid SLS. Measure the resistance between terminals #D5 and #D6 on transmission connector D. The resistance should be 5-5.6 ohms at 20°C.

Other information:
- To disconnect the transmission connectors, see Connectors transmission, disconnecting / connecting Procedures
- For information about signals, see Signal description. Transmission control module (TCM), AW50/51 AWD, AW55-50/51SN Signal Description. Transmission Control Module (TCM).









Was the resistance OK?

Yes - Checking the wiring

No - Checking the wiring and component

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Checking the wiring








- Ignition off
- The breakout box connected
- Transmission connector D disconnected.
Check the cable between transmission control module (TCM) terminal #A49 (#A49) and transmission connector terminal #D5 (control module side). Check for a short-circuit to ground. See Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check the cable between control module terminal #B7 (#A67) and transmission connector terminal #D6 (control module side). Check for a short-circuit to ground. See Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Remedy as necessary.

Other information:
- To connect the breakout box, see Connecting the breakout box, B5244T5, B5254T2 Connecting the Breakout Box
- To disconnect the transmission connectors, see Connectors transmission, disconnecting / connecting Procedures
- For information about signals, see Signal description. Transmission control module (TCM), AW50/51 AWD, AW55-50/51SN Signal Description. Transmission Control Module (TCM).









Was a fault detected?

Yes - Verification

No - Checking the control module

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Checking the control module












- Ignition off
- The breakout box connected
- Connect the control module.
- Transmission connector D disconnected.
Check the transmission control module (TCM) by measuring the resistance between terminals #A49 (#A49) and #B7 (#A67) on the breakout box. The resistance must be approximately 9 kohms.

Note! When removing the transmission connector, the control module may store diagnostic trouble codes (DTCs) for the gear-shift position sensor, the shift solenoids, the temperature sensor etc.

Try a new control module if the resistance is infinite.

Other information:
- To disconnect the transmission connectors, see Connectors transmission, disconnecting / connecting Procedures
- To replace the control module, see Transmission control module (TCM), replacing, B5244T5, AW55-50/51SN, B5254T2, AW55-50/51SN, B5254T2, AW50/51 AWD Service and Repair
- For information about signals, see Signal description. Transmission control module (TCM), AW50/51 AWD, AW55-50/51SN Signal Description. Transmission Control Module (TCM).









Was the resistance OK?

Yes - No Fault Found

No - Verification

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Checking the wiring and component








- Ignition off
- Open the transmission control system.
Check the wiring between transmission connector terminal #D5 (transmission side) and solenoid SLS terminal #1. Check the wiring between transmission connector terminal #D6 (transmission side) and solenoid SLS terminal #2. Check for a short-circuit to ground. See Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check solenoid SLS by measuring the resistance between terminals #1 and #2 on the connector. The resistance must be 5-5.6 ohms at 20°C. Replace the transmission control system if the resistance is incorrect.

Other information:
- To disconnect the transmission connectors, see Connectors transmission, disconnecting / connecting Procedures
- To open and replace the transmission control system, see Solenoid control system, replacing Solenoid Control System, Replacing
- To replace the cable harness for the control system, see Wiring harness / oil temperature sensor, replacing Removal and Replacement
- For information about signals, see Signal description. Transmission control module (TCM), AW50/51 AWD, AW55-50/51SN Signal Description. Transmission Control Module (TCM).

Location Of Components (Solenoids):

Continue - Resetting the adaptation and oil quality counter

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Resetting the adaptation and oil quality counter





Resetting the adaptation

Resetting adaptation and the counter for "Transmission oil change"

Hint: The transmission has torque controlled adaptive pressure control. Pressure control means that the transmission regulates the pressure itself during each gear shift. This avoids harsh gear shifting. Each gear shift is evaluated by the control module and stored in the memory. This allows for compensation for wear and tear in the transmission and clutch. It is important that the adaptation in the memory is reset after the transmission has been repaired. This is to ensure normal operation. The oil is replaced during repair; the "Transmission oil change" counter must be reset. If the counter is not reset when the fluid is drained and replaced, there is a risk that a diagnostic trouble code (DTC) will be stored in incorrect circumstances.

Note! This applies only if the transmission or one of the components in the transmission have been replaced.




- Ignition on.
Click on the VCT2000 symbol to reset the adaptation and counter.






Continue - DONE

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DONE - Verification

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Verification




Verification

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








- Ignition on.
- Activate solenoid SLS.
Read off the current through the solenoid SLS circuit.
The current should oscillate between 0 and 1000 mA.





Does the current oscillate?

Yes - VERIFIED

No - VERIFICATION FAILEDPAPER

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VERIFICATION FAILED - Fault-tracing information

VERIFIED - Fault Found

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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 - FAULT-TRACING FAILED

No - Attempt New Test

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FAULT-TRACING FAILED - FAULT-TRACING FAILED

Attempt New Test - Checking line pressure solenoid SLS

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