Signal Too Low

Signal too low

Checking the status




- Ignition on.
Activate the fuel pump (FP) relay.
Check if the fault is permanent or intermittent.
The fault is permanent if the fuel pump (FP) relay does not activate.
If the fuel pump (FP) relay is activated, 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 component and wiring

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Checking the component and wiring




- Ignition off.
Check that the fuel pump (FP) relay is correctly installed.
Also check the fuel pump relay, in particular terminal #2. Check for a short-circuit to ground.
If no fault was found on the fuel pump relay and replacing the relay did not help, try replacing the central control module (CEM).
Remedy as necessary.

Other information
- Connecting the breakout box Connecting the Breakout Box, Central Electronic Module (CEM)
- Signal specification Signal Description, Central Electronic Module (CEM)
- For further information about the fuses and relays, see the Wiring Diagram
- Control module relay box passenger compartment Service and Repair
- Checking wiring and terminals Checking Wiring and Terminals





Continue - Verification

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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.
- Ignition on.
Click the VCT2000 symbol to activate and deactivate the relay.
A click should be heard from the relay.
Check that the function is OK.





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 - Checking the component and wiring

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