Faulty Signal

Faulty signal

Checking the pump motor




- Ignition on.
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





Is the oil pump motor working?

Yes - No Fault Found

No - Checking the status

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Checking the status








- Ignition on
- Disconnect the 2-pin connector for the feed pump.
Disconnect the connector from the differential electronic module (DEM) to the feed pump. Take a reading using a voltmeter between terminals #1 and #2 on the connector for the pump motor. The voltmeter should read battery voltage.
If the voltage was OK, check the connector. Check for bent or damaged pins.
Remedy as necessary.

Other information:
- For information about signals, see Signal specification, control module for four wheel drive Signal Specification, Control Module for Four Wheel Drive
- Checking wiring and terminals Checking Wiring And Terminals.

Select an alternative below:
1. Faulty power supply
2. Bent or damaged terminals
3. No fault detected.









1 - Replacing the control module

2 - Fault Found

3 - Replacing the component

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Replacing the control module
Replace the differential electronic module (DEM). See Differential electronic module (DEM), replacement Service and Repair.






Continue - Verification

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Replacing the component
Replace the feed pump. See Oil pump active on demand coupling (AOC), replacing Oil Pump Active On Demand Coupling (AOC), Replacing.






Continue - Verification

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Verification

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








- Ignition off
- Reconnect the connectors, reinstall components etc.
- Ignition on.
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.





Is the oil pump motor working?

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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Attempt New Test - Checking the pump motor

FAULT-TRACING FAILED - FAULT-TRACING FAILED

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