Signal Missing

Signal missing

Checking the status




- Ignition on.
Activate the valve in the leak diagnostic unit to check whether the fault is permanent or intermittent.
The valve clicks when it is activated.
The fault is permanent if the valve does not activate.
The fault is intermittent if the valve activates.






Continue - Checking components and wiring

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Checking components and wiring
Check the fuse before the circuit.
Check the leak diagnostic unit connectors. Check for contact resistance and oxidation.
Check the resistance of the valve between the leak diagnostic pump connector terminals #3 and #4 (leak diagnostic unit side).
Check the signal cable between control module terminal #B40 (#B50) and leak diagnostic unit terminal #3. Check for an open-circuit.
Check the power supply cable between system relay terminal #5 and leak diagnostic unit terminal #4. Check for an open-circuit.
Remedy as necessary.

Other information:
- Checking wiring and terminals Checking Wiring And Terminals
- For resistance values, see Component specifications Specifications
- To connect the breakout box, see Connecting the breakout box, B5244T5, B5254T2 Connecting the Breakout Box
- For information about signals on 5 cylinder engines, see Signal specification Signal Description / Specification
- For information about signals on 6 cylinder engines, see Signal specification Signal Description / Specification
- To access or replace the leak diagnostic unit, see Leak diagnostic pump, replacing Service and Repair
- For further information about the fuses and relays, see the Wiring Diagram.














Continue - Verification

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Verification




Verification

Verification

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




- Ignition on
- Activate the valve in the leak diagnostic unit.
The valve should click.
Check that the function is OK.









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 status

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