Incorrect Value
Incorrect value
Checking the oil pressure
- Ignition on.
Read off the oil pressure in the Differential Electronic Module (DEM). The pressure must rise when the engine speed exceeds 500 rpm. Use VIDA Vehicle communication.
First read off the oil pressure with the ignition on and then with the engine running. At read out, the oil pressure must rise when the engine rpm exceeds 500 rpm, the pressure must rise immediately after the engine's rpm increases.
If the pressure does not rise, this means that a fault has occurred.
Does the pressure increase?
Yes - Information
No - Checking the component and wiring
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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 Pinout Values and Diagnostic Parameters
- 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 the oil pressure
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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
- Ignition on.
Check status for relevant diagnostic trouble code.
No further corrective action is required if the diagnostic trouble code (DTC) is intermittent and does not recur.
If the DTC status is permanent, continue with fault tracing.
Do you wish to continue with fault tracing?
Yes - Checking the component and wiring
No - Fault Found
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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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