Faulty Signal

Faulty signal

Checking the status




- Engine idling.
Check if the pump motor in the unit for four wheel drive (Active on Demand Coupling) starts and runs normally.

Hint: The motor must hum and vibrate slightly. Listen using a stethoscope or a screwdriver pressed to your ear.

If the pump motor starts, this is an indication that the fault was present previously but that it is not active at the moment, i.e. the fault is intermittent.






Continue - Checking the connectors and cables

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Checking the connectors and cables








- Ignition off
- Check the connector between the differential electronic module (DEM) and the feed pump. Check for contact resistance and oxidation
- Check the cable between the differential electronic module (DEM) and the feed pump. Check for damage
- Engine idling.
Check the voltage by taking readings using a voltmeter on the control module connector for the pump motor. Take readings between terminals #1 and #2.

Note! The voltage is a pulse width modulated signal which varies greatly and can only be read off for a short time. The purpose of the reading is only to provide an indication of whether there is an open-circuit or not.

Remedy as necessary.

Other information:
- Signal specification, differential electronic module (DEM) , M58, AW50/51 AWD Pinout Values and Diagnostic Parameters
- Oil pump active on demand coupling (AOC), replacing Oil Pump Active On Demand Coupling (AOC), Replacing
- Checking wiring and terminals Checking Wiring And Terminals










Continue - Verification

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Verification




Verification

Verification

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








- Ignition off
- Reinstall the connectors, components etc.
- Engine idling.
Check if the pump motor in the unit for four wheel drive (Active on Demand Coupling) starts and runs normally.

Hint: The motor must hum and vibrate slightly. Listen using a stethoscope or a screwdriver pressed to your ear.

Does the feed pump work?

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 status

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