Signal Too Low

Signal too low

Checking the status




- Ignition on.
Read off the status of the waking signal for the engine control module (ECM).
Change the key position from position I to II.
Check if the fault is permanent or intermittent.
The status of the waking signal for the engine control module (ECM) must change when changing the key position.
If the status of the waking signal for the engine control module (ECM) does not change, the fault is permanent.
If the status of the waking signal for the engine control module (ECM) changes, 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 central electronic module (CEM) connector terminal E and integrated relay/fusebox (engine compartment) connector. Check for contact resistance. Check for oxidation. Check for damage. Check for loose connections. Also check the intermediate connector.
Check signal cable for a short-circuit to ground.
Take readings between:
- Central electronic module (CEM) terminal #E10 (#10) and the engine compartment integrated relay/fusebox #37.
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)
- 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.
Activate reading off the status. Click the VCT2000 symbol.
Activate and deactivate the function.
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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