Faulty Signal

Faulty signal

Information about symptom fault-tracing
The diagnostic trouble codes (DTCs) are included in a larger fault-tracing for the symptom Starter motor not running.
Add the symptom and fault trace according to Checking the start system.
If this has already been carried out, continue fault tracing.

Do you want to continue with this procedure?

Yes - Checking the ignition switch

No - DONE

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Checking the ignition switch
- Click on the VCT2000 symbol.
- Check that the status of the ignition switch corresponds to all key positions.
Compare with table in link below.

Other information
- For table,
Description of switch for start control unit (SCU) Description of Switch For Start Control Unit (SCU)





Are all key positions OK?

Yes - Fault-tracing information

No - Checking the wiring

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Checking the wiring








- Ignition off
- Disconnect the start control module (SCU) connector.
Check the signal cable. Check for an open-circuit. Check for a short-circuit to ground.
Take readings between:
- Central electronic module (CEM) terminal #A30 (#30) and start control module (SCU) terminal #1
- Central electronic module (CEM) terminal #A42 (#42) and start control module (SCU) terminal #2
- Central electronic module (CEM) terminal #A17 (#17) and start control module (SCU) terminal #3.
- Central Electronic Module (CEM) terminal #A15 (#15) and Start Control Unit (SCU) terminal #5.
Check the fuse for the Start Control Unit (SCU).
For further information, see the wiring diagram.
Remedy as necessary.

Other information
- Connecting the breakout box Connecting the Breakout Box, Central Electronic Module (CEM)
- Location of components Component Location, Central Electronic Module (CEM)
- Control module relay box passenger compartment Service and Repair
- Checking wiring and terminals Checking Wiring and Terminals

Was a fault detected?

Yes - Verification

No - Replacing the Start Control Unit (SCU)

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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.

Check as follows
- Click on the VCT2000 symbol.
Check that the status of the ignition switch corresponds to all key positions.
Compare with table in link below.

Other information
- For table,
Description of switch for start control unit (SCU) Description of Switch For Start Control Unit (SCU)





Are all key positions 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 ignition switch

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Fault-tracing information
If no fault is discovered, this indicates that the control module has previously registered a fault, but that the fault is no longer present.
The fault is intermittent. No further fault-tracing is required.

Continue - DONE

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Replacing the Start Control Unit (SCU)




The problem indicates that the control module is defective and needs to be replaced.

Other information





Continue - Verification

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