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) , M58, AW50/51 AWD Signal Specification, Differential Electronic Module (DEM)
- Active on Demand Coupling (AOC), replacing Service and Repair
- Differential electronic module (DEM), replacement Service and Repair
- 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 - FAULT-TRACING FAILED
No - Attempt New Test
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FAULT-TRACING FAILED - FAULT-TRACING FAILED
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) , M58, AW50/51 AWD Signal Specification, Differential Electronic Module (DEM)
- Active on Demand Coupling (AOC), replacing Service and Repair
- Differential electronic module (DEM), replacement Service and Repair
- 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, M58, M66 AWD, AW50/51 AWD Temperature / Pressure Sensor Active On Demand Coupling, Replacing
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 Temperature / Pressure Sensor Active On Demand Coupling (AOC), Replacing
Has the fault been remedied?
Yes - DONE
No - No Fault Found
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DONE - DONE
No Fault Found - Checking components
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