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Home >> Volvo >> 2006 >> S80 AWD L5-2.5L Turbo VIN 59 B5254T2 >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> Manufacturer Code Charts >> DEM Codes (Differential Electronic Module) >> DEM-000B >> Incorrect Value

Incorrect Value






Incorrect value

Information

Note! The diagnostic trouble code can also be generated due to damaged AOC-unit (clutch). Check the AOC-unit for visible damages. Listen for noise. Check the oil level in the coupling (Active on Demand Coupling).

Continue - Information

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Checking components




- Engine idling.




Check the function of the oil pump.
Listen using a stethoscope or a screwdriver pressed to your ear. The oil pump motor shall hum and vibrate slightly.

Note! The pump motor may sound like it's running but in certain cases it only oscillates.

Is the feed pump working?

Yes - Checking the function

No - Checking the connectors and cables

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Information

Note! The brake control module (BCM) can cause interference in the differential electronic module (DEM). For example, incorrect information from one of the wheel speed sensors causes the information from the Brake control module (BCM) to store a diagnostic trouble code (DTC). Therefore, troubleshoot the Brake Control Module (BCM) for incorrect signals from the wheel speed sensors.

Continue - Checking pressure and temperature sensor

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Checking the connectors and cables




- Ignition off.
Check the connector between the Differential Electronic Module (DEM) and the feed pump with respect to contact resistance and oxidation.
Check the lead between the Differential Electronic Module (DEM) and the feed pump for damage.
Reinstall the connectors, components etc.




- Engine idling.




Check the function of the oil pump.
Listen using a stethoscope or a screwdriver pressed to your ear. The oil pump motor shall hum and vibrate slightly.

Note! The pump motor may sound like it's running but in certain cases it only oscillates.

Remedy as necessary.

Other information
- Signal specification, differential electronic module (DEM) , AW50/51 AWD Signal Specification, Differential Electronic Module (DEM)
- Active on Demand Coupling (AOC), replacing Active on Demand Coupling (AOC), Replacing
- Differential electronic module (DEM), replacement Differential Electronic Module (DEM), Replacing
- Checking wiring and terminals Checking Wiring And Terminals

Is the feed pump working?

Yes - Verification

No - Fault-tracing information

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Verification

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

Test-driving is required to ensure that the malfunction has been fixed.
Test drive the vehicle following:
Test driving on lift, automatic transmission, AW50/51 AWD Initial Inspection and Diagnostic Overview
Check that the diagnostic trouble code (DTC) is not generated again after the test-drive.

Is the function OK?

Yes - FAULT FOUND

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 - Information

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Checking the function




Check that the AOC-unit works by test-driving the vehicle on the lift (to increase the clutch oil pressure). Read off the oil pressure during the test-drive.
Test drive the vehicle following:
Test driving on lift, automatic transmission, AW50/51 AWD Initial Inspection and Diagnostic Overview

Hint: If the AOC-unit is not working, try with replacing control module.
Repeat the test-drive.

Other information
- Signal specification, differential electronic module (DEM) , AW50/51 AWD Signal Specification, Differential Electronic Module (DEM)
- Active on Demand Coupling (AOC), replacing Active on Demand Coupling (AOC), Replacing
- Differential electronic module (DEM), replacement Differential Electronic Module (DEM), Replacing
- Checking wiring and terminals Checking Wiring And Terminals









Is the function OK?

Yes - Verification

No - Fault-tracing information

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Checking pressure and temperature sensor





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 - DONE

No - No Fault Found

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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 (AOC), replacing Service and Repair





Has the fault been remedied?

Yes - DONE

No - Checking components

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