Signal Too Low
Signal too low
Checking the function of the oil temperature sensor
- Ignition on.
- Read off oil temperature.
Check that the temperature is within its permitted range.
Compare with the transmission temperature.
Note! The transmission temperature sensor is located inside the control unit and can be affected by the heat given off by the solenoids.
Was the transmission temperature within its permitted range?
Yes - Intermittent fault
No - Checking wiring and components
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Checking wiring and components
Check the cable between transmission control module (TCM) #A37 (#A37)and transmission connector (control module side) #12 for a short-circuit to ground according to 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, B5234T9, B5244T7 Connecting The Breakout Box.
- To disconnect the transmission connector, see Replacement Of Control System Cable Harness With Oil Temperature Sensor.
- For information about signals, see Signal description. Transmission control module (TCM), AW55-50/51SN Signal Description AW50-42.
Was a fault detected?
Yes - Resetting the adaptation and oil quality counter
No - Checking the oil temperature sensor
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Checking the oil temperature sensor
- Ignition off.
- Transmission connector disconnected.
Check the temperature sensor by measuring the resistance between transmission connector A #12 and #13.
The resistance should be 4.5-6 kohms.
Was the resistance OK?
Yes - No Fault Found
No - Replacing the transmission
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Replacing the transmission
Note! Transmission AW 55-50SN must be replaced in the event of internal faults during the first year on the market.
Replace the transmission according to Removing the transmission Transmission, Removal.
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 off.
- Reinstall the connectors, components etc.
- Ignition on.
- Read off the oil temperature.
Check that the transmission oil temperature is within its permitted range.
Compare with the transmission temperature.
Note! The transmission temperature sensor is located inside the control unit and can be affected by the heat given off by the solenoids.
Is the oil temperature within its permitted range?
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 - Exit fault-tracing
No - Attempt New Test
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Attempt New Test - Checking the function of the oil temperature sensor
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Intermittent fault
Check the cable between transmission control module (TCM) #A37 (#A37)and transmission connector (control module side) #12 for an intermittent short-circuit to ground according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Remedy as necessary.
Other information:
- To connect the breakout box, see Connecting the breakout box, B5234T9, B5244T7 Connecting The Breakout Box.
- To disconnect the transmission connector, see Replacement Of Control System Cable Harness With Oil Temperature Sensor.
- For information about signals, see Signal description. Transmission control module (TCM), AW55-50/51SN Signal Description AW50-42.
Continue - Fault-tracing information
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Fault-tracing information
Information
Fault-tracing information
If the fault is intermittent, do not verify fault-tracing if the fault does not recur.
It is possible to view the information again, or leave fault-tracing for this diagnostic trouble code (DTC).
Do you want to view the information again?
Yes - Attempt New Test
No - FAULT FOUND
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Attempt New Test - Checking the function of the oil temperature sensor
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