Signal Too Low. Permanent Fault

Signal too low. Permanent fault

Checking the wiring and component




- Ignition off.
Check at the battery that the battery voltage is not too low.
Check the system relay and system relay base. Check for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check fuse 12 the integrated relay / fusebox in the engine compartment. If the fuse is blown, check the circuit for the fuse for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check the cable between system relay base terminal #3 and fuse 12 in the integrated relay / fusebox in the engine compartment. Check for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

Hint: The voltage between ground and system relay base terminal #3 must be approximately 12 volt.

Check the cable from system relay base terminal #5. Check for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Check for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Try a new system relay if no fault is found during the above fault-tracing.
Remedy as necessary.

Other information
- To connect the breakout box and access the control module, see Connecting the breakout box. EMS 2000 Connecting The Breakout Box. EMS 2000
- To access or replace the system relay, see Engine compartment Engine Compartment
- For information about signals see Signal specification Signal Specification.









Continue - Verification

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Verification




Verification

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




- Reinstall the components, reconnect the connectors etc.
- Ignition on.
Activate the system relay. Check that the relay clicks and the fuel pump (FP) starts when it is activated.





Is the function OK?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFICATION FAILED - Fault-tracing information

VERIFIED - FAULT FOUND

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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 wiring and component

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