Signal Too Low

Signal too low

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 the wiring

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Checking the wiring
Check the signal cable from engine control module (ECM) terminal #B40 (#B50) to leak diagnostic pump terminal #3. Check for an open-circuit. Check for a short-circuit to ground.
Check the engine control module (ECM) and leak diagnostic pump connectors. Check for contact resistance and oxidation.
Remedy as necessary.

Other information:
- To connect the breakout box, see Connecting the breakout box Connecting the Breakout Box
- For information about signals, see Signal specification Signal Description / Specification
- To access or replace the leak diagnostic unit, see Leak diagnostic pump, replacing Service and Repair
- To fault-trace the wiring and terminals, see 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 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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