Fault-Tracing

Fault-tracing

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 components

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Checking components
- 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. 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 - Information

No - Checking the connectors and cables

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Information
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 the function

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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.
- 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. The feed pump motor must 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, B8444S, TF-80SC AWD, B6324S, TF-80SC AWD Signal Specification, Differential Electronic Module (DEM)













Is the feed pump working?

Yes - Verification

No - Fault-tracing information

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Checking the function

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.

- Ignition on.
Read the oil pressure sensor signal to check the function.
At ignition on the oil pressure shall be 0.00 +/- 0.04 MPa.
- Engine idling.
With engine at idle speed the oil pressure should be 0.65 +/- 0.05 MPa.









Is the function OK?

Yes - Checking the function

No - Replacement of temperature/pressure sensor

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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:

Hint: If the AOC-unit is not working, try with replacing control module. Repeat the test-drive.

Other information:
- Signal specification, B8444S, TF-80SC AWD, B6324S, TF-80SC AWD Signal Specification, Differential Electronic Module (DEM)









Is the function OK?

Yes - Verification

No - Fault-tracing information

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Replacement of temperature/pressure sensor
- Ignition on.
Replace oil pressure sensor.

Hint: The oil pressure sensor is integrated with the oil temperature sensor and these are located together with the Differential Electronic Module (DEM). Temperature/pressure sensor is replaceable.

Check that the oil pressure sensor works after the replacement.
- Ignition on.
Read the oil pressure sensor signal to check the function.
At ignition on the oil pressure shall be 0.00 +/- 0.04 MPa.
- Engine idling.
With engine at idle speed the oil pressure should be 0.65 +/- 0.05 MPa.

Other information:
- Signal specification, B8444S, TF-80SC AWD, B6324S, TF-80SC AWD Signal Specification, Differential Electronic Module (DEM)









Is the function OK?

Yes - Verification

No - Checking the function

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Verification




Verification





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

- Ignition off.
- Reinstall the connectors, components etc.
Test-driving is required to ensure that the malfunction has been fixed.
Test drive the vehicle following:

Check that the diagnostic trouble code (DTC) is not generated again after the test-drive.

Is the function OK?

Yes - Troubleshooting procedure complete

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 - Exit Fault-tracing

No - Attempt New Test

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Attempt New Test - Information

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