Electrical Fault

Electrical fault

Checking battery voltage




- Start the engine
- Read off the battery voltage. The central electronic module (CEM) uses the prevailing outside temperature to calculate the voltage at which the battery should be charged
- Switch on a few major power consuming components, such as the blower fan.
Check that the voltage is within the limits of 13.5-14.9 V. Try at different engine speeds (RPM).
The fault is permanent if the voltage is outside the permitted range.
If the voltage is within the permitted range, the fault was present previously but is not active at the moment, i.e. an intermittent fault.









Select Continue

Continue - Checking the component

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Checking the component




- Ignition off.
Check the carbon brushes. If the brushes are worn, replace the alternator control module (ACM). Check that the brushes can move in the regulator housing. The brushes are lightly sprung. At the same time, check the slip rings. Replace the generator (GEN) if they are worn out.
If the brushes and slip rings appear to be OK, try a new alternator control module (ACM) (charge regulator). If this does not help, try a new generator (GEN).
Remedy as necessary.

Other information:
- Checking wiring and terminals Checking Wiring And Terminals






Continue - Verification

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Verification




Verification

Verification

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








- Ignition off
- Reinstall the connectors, components etc.
- Ignition on
- Read off the battery voltage. The central electronic module (CEM) uses the prevailing outside temperature to calculate the voltage at which the battery should be charged
- Switch on a few major power consuming components, such as the blower fan.
Check that the voltage is within the limits of 13.5-14.9 V. Try at different engine speeds (RPM).









Is the voltage 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 - FAULT-TRACING FAILED

No - Attempt New Test

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FAULT-TRACING FAILED - FAULT-TRACING FAILED

Attempt New Test - Checking battery voltage

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