Faulty Signal

Faulty signal

Checking the connectors and cables








- Ignition off
- Check the connector between the differential electronic module (DEM) and the temperature sensor. Check for contact resistance and oxidation.

Hint: Read off the temperature sensor signal to check the function.

Remedy as necessary.

Other information:
- Signal specification, differential electronic module (DEM) , AW50/51 AWD Signal Specification, Differential Electronic Module (DEM)
- Temperature / pressure sensor active on demand coupling, replacing, B5254T2, AW50/51 AWD Service and Repair
- Differential electronic module (DEM), replacement Differential Electronic Module (DEM), Replacing
- Checking wiring and terminals Checking Wiring And Terminals









Continue - Verification

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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 temperature.
Check that the value is within its permitted range. Compare it to the ambient temperature.





Is the temperature reading OK?

Yes - Verification completed

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 the connectors and cables

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Checking pressure and temperature sensor





Checking pressure and temperature sensor

Note! Reading out of oil pressure can take place first after the diagnostic trouble code (DTC) has been deleted. Therefore frozen values should be printed and saved before deleting takes place.

1. Test of pressure sensor.
- Ignition on.
- Press the VCT2000 symbol.

Hint: Correct pressure shall be 0.00 +/- 0.08 MPa.

- Engine idling
- Press the VCT2000 symbol.

Hint: Correct pressure shall be 0.38 +/- 0.08 MPa.

1. Test of temperature sensor.
- Ignition on.
- Press the VCT2000 symbol.

Hint: Normal value for ambient temperature when the vehicle is cold and (+20 to +50 °C) when the vehicle is driven.

If wrong value is read out, then diagnostic trouble code shall be erased and the sensor changed. After changing sensor, repeat the test procedure again.

Note! There are two types of sensors, an 80 bar and a 40 bar. Differential electronic module (DEM) has hardware number 30759701, 30785483, 30759682, 30783198, 30735844, or 30783018, an 80 bar pressure sensor shall be installed. If Differential electronic module (DEM) has another hardware number than above, a 40 bar sensor shall be installed.

Hint: For reading out of hardware number, see VIDA/DIAGNOSTICS/NETWORK/DEM.

Other information
- Temperature / pressure sensor active on demand coupling, replacing, B5254T2, AW50/51 AWD Service and Repair





Has the fault been remedied?

Yes - Procedure completed

No - Checking the connectors and cables

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