Signal Too Low
Signal too low
Checking the function of the oil temperature sensor
- Ignition on
- Read off the 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 system and may be affected by the heat given off by the solenoids.
Was the transmission temperature within its permitted range?
Yes - Intermittent fault
No - Checking transmission fluid temperature sensor
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Checking transmission fluid temperature sensor
- Ignition off
- Disconnect transmission connector D.
Check the temperature sensor. Measure the resistance between transmission connector D terminals #D7 and #D8.
The resistance must be 4.5-6 kohms at 20°C.
Was the resistance OK?
Yes - Checking the wiring and component
No - Checking the cable and component
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Checking the wiring and component
Check the cable between transmission control module (TCM) terminal #A37 (#A37) and transmission connector terminal #D7 (control module side). Check 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, B5244T5, B5254T2 Connecting the Breakout Box
- To disconnect the transmission connector, see Connectors, transmission, disconnecting / connecting, B5244T5, AW55-50/51SN, B5254T2, AW55-50/51SN, B5254T2, AW50/51 AWD 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 cable and component
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Checking the cable and component
- Ignition off
- Open the transmission control system.
Check the cable between transmission connector terminal #D7 and temperature sensor terminal #1. Check the cable between transmission connector #D8 and temperature sensor terminal #2. Check for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Also check the cables for a short-circuit to each other.
Hint: Check the temperature sensor. With the ignition off and transmission connector D disconnected, measure the resistance between transmission connector D terminals #D7 and #D8.
The resistance must be 4.5-6 kohms at 20 °C.
Remedy as necessary
Other information:
- To disconnect the transmission connector, see Connectors, transmission, disconnecting / connecting, B5244T5, AW55-50/51SN, B5254T2, AW55-50/51SN, B5254T2, AW50/51 AWD Procedures
- To open the transmission control system and to check or replace the temperature sensor, see Solenoid control system, replacing Solenoid Control System, Replacing
- To replace the cable harness for the control system, see Cable 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).
Continue - Resetting the adaptation and oil quality counter
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Resetting the adaptation and oil quality counter
Resetting Transmission fluid change counter
Resetting Transmission fluid change counter
Hint: The transmission control module (TCM) has a counter for the oil quality. The counter counts up if the transmission is exposed to too high a load or an ambient temperature that is too high. If the counter is not reset when the oil is drained or changed, there is a risk that a diagnostic trouble code (DTC) will be stored in faulty circumstances. Therefore it is important that the "Transmission oil change" counter is reset.
Note! This applies only when the transmission fluid is changed and when the fluid is changed when repairs are carried out to the transmission temperature sensor.
- Ignition on.
Reset the counter by clicking on the VCT 2000 symbol.
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
PAPER - No Fault Found
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 the function of the oil temperature sensor
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Intermittent fault
Check the cable between transmission control module (TCM) terminal #A37 (#A37) and transmission connector terminal #D7 (control module side). Check for an intermittent short-circuit to ground according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults.
Also check the cables for a short-circuit to each other. For information about the circuit, see the relevant Wiring Diagram.
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 connector, see Connectors, transmission, disconnecting / connecting, B5244T5, AW55-50/51SN, B5254T2, AW55-50/51SN, B5254T2, AW50/51 AWD Procedures
- For information about signals, see Signal description. Transmission control module (TCM), AW50/51 AWD, AW55-50/51SN Signal Description. Transmission Control Module (TCM).
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
FAULT FOUND - Fault Found
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