Incorrect Value
Incorrect value
Checking the function
- 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.
- Ignition on.
Activate the feed pump and check that it starts and runs normally. Listen using a stethoscope or a screwdriver pressed to your ear.
Note! The feed pump may sound like it's running but in certain cases it only oscillates.
Remedy as necessary.
Other information:
- For further information about the fuses and relays, see the Wiring Diagram
- Signal specification, differential electronic module (DEM) , M58, AW50/51 AWD Signal Specification, Differential Electronic Module (DEM)
- Location of components, M58, AW50/51 AWD Locations
Select continue when the defect has been remedied.
Continue - Information
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Verification
Verification
Verification
Hint: After carrying out the repair, check that the fault has been remedied.
Caution! Carry out the test with the vehicle raised so that all four wheels can rotate freely with the mounting at the ends of the control arms to prevent damage to the drive shafts.
Warning! Ensure that the vehicle is safely raised. Check that no objects are caught in the tire treads.
Note! If the vehicle is equipped with TRACS (traction control system) or Traction Control (DSTC (Dynamic stability and traction control), STC (Stability and traction control)) the function must be deactivated. This is carried out by removing the fuse for the brake system pump motor in the engine compartment relay and fusebox. Note that diagnostic trouble codes (DTCs) will be stored in the brake control module (BCM). These must be erased before returning the vehicle to the customer.
- Ignition off
- Reinstall the connectors, components etc.
- Engine idling
- Read off the oil pressure.
Check that the function of the oil pressure sensor is OK. Run the engine with the vehicle on the lift to increase the clutch oil pressure. Read off the pressure during the test drive. Check that the pressure has been updated.
Hint: The oil pressure sensor has a measurement range of 0 to 4 Mpa.
Is the function OK?
Yes - VERIFIED
No - VERIFICATION FAILED
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VERIFIED - Fault Found
VERIFICATION FAILED - 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 - Checking pressure and temperature sensor
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Checking the component and wiring
- Ignition off.
Check the connector for the Differential electronic module (DEM). Check for damage and loose connections.
Check that the cable harness is intact and not trapped or damaged.
Check that the oil pressure sensor (13) is correctly installed and that it does not have any external damage. Check that the oil pressure sensor oil ducts are intact and free of dirt.
Remedy as necessary.
If no fault is found, try a new pressure sensor.
Other information
- Checking wiring and terminals Checking Wiring And Terminals
- Temperature / pressure sensor active on demand coupling (AOC), replacing Temperature / Pressure Sensor Active On Demand Coupling (AOC), Replacing
Is the function OK?
Yes - Fault Found
No - Checking the function
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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 - Checking the function
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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:
Checking four wheel drive Checking Four Wheel Drive Checking four wheel drive, AW50/51 AWD Checking Four Wheel Drive
Test driving Active on Demand Coupling, automatic transmission, AW50/51 AWD Test Driving Active On Demand Coupling, Automatic Transmission
Continue - Verification
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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 (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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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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DONE - DONE
No Fault Found - Checking the component and wiring
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