Signal Missing. Permanent Fault
Signal missing. Permanent fault
Checking line pressure solenoid SLT
- Ignition off
- Check the control module and automatic transmission connectors. Check for contact resistance and oxidation. Remedy if necessary.
Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault
- Reinstall the components, reconnect the connectors etc.
- Ignition on
- Activate solenoid SLT.
Read off the current through the solenoid SLT circuit.
The current should oscillate between 0 and 1000 mA.
Other information:
- Connectors, transmission, disconnecting / connecting, B5244T5, AW55-50/51SN, B5254T2, AW55-50/51SN, B5254T2, AW50/51 AWD Procedures
- Transmission control module (TCM), replacing, B5244T5, AW55-50/51SN, B5254T2, AW55-50/51SN, B5254T2, AW50/51 AWD Service and Repair
Does the current oscillate?
Yes - Fault Found
No - Checking resistance
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Checking resistance
- Ignition off
- Transmission connector D disconnected.
Check the circuit for solenoid SLT. Measure the resistance between terminals #D3 and #D4 on transmission connector D. The resistance should be 5-5.6 ohms at 20°C.
Other information:
- Connectors, transmission, disconnecting / connecting, B5244T5, AW55-50/51SN, B5254T2, AW55-50/51SN, B5254T2, AW50/51 AWD Procedures
- 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
- Disconnect transmission connector D.
Check the cable between Transmission control module (TCM) terminal #A52 (#A52) and transmission connector terminal #D3 (transmission side). Check for an open-circuit. Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault
Check the cable between control module terminal #B10 (#A70) and transmission connector terminal #D4 (transmission side). Check for an open-circuit. Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault
Remedy as necessary.
Other information:
- Connecting the breakout box, B5244T5, B5254T2 Connecting the Breakout Box
- Connectors, transmission, disconnecting / connecting, B5244T5, AW55-50/51SN, B5254T2, AW55-50/51SN, B5254T2, AW50/51 AWD Procedures
- Signal description. Transmission control module (TCM), AW50/51 AWD, AW55-50/51SN Signal Description. Transmission Control Module (TCM)
Was a fault found in the wiring?
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 #52 (#A52) and #B10 (#A70) 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:
- Connectors, transmission, disconnecting / connecting, B5244T5, AW55-50/51SN, B5254T2, AW55-50/51SN, B5254T2, AW50/51 AWD Procedures
- Transmission control module (TCM), replacing, B5244T5, AW55-50/51SN, B5254T2, AW55-50/51SN, B5254T2, AW50/51 AWD Service and Repair
- 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 cables between transmission connector terminal #D3 and solenoid SLT #1 and between transmission connector terminal #D4 and solenoid SLT #2. Check for an open-circuit. Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault
Also check against the other cables in the circuit. Use the relevant wiring diagram.
Check solenoid SLT by measuring the resistance between terminals #1 and #2 on the connector. The resistance should be 5-5.6 ohms at 20°C. Replace the control system if the resistance is incorrect.
Other information:
- Connectors, transmission, disconnecting / connecting, B5244T5, AW55-50/51SN, B5254T2, AW55-50/51SN, B5254T2, AW50/51 AWD Procedures
- Solenoid control system, replacing Solenoid Control System, Replacing
- 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 SLT.
Read off the current through the solenoid SLT circuit.
The current should oscillate between 0 and 1000 mA.
Does the current oscillate?
Yes - VERIFIED
No - VERIFICATION FAILED
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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 SLT
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