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)
- 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 - VERIFIED

No - VERIFICATION FAILED

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VERIFIED - FAULT FOUND

VERIFICATION FAILED - Fault-tracing information

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Fault-tracing information

Attempt New Test - Checking the component and wiring

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