Signal Too High/Faulty Signal

Signal too high/Faulty signal

Checking battery voltage




- Start the engine
- Read off the battery voltage and the target value of the generator (GEN) charge voltage
- Load the battery by switching on high current consumers such as high beam and the blower fan etc.
Check that the battery voltage is approximately 13.5 -14.9 V. Check that the battery voltage is approximately the same as the target value for the generator (GEN) voltage. Try different engine speeds (RPM).
The fault is permanent if the function is incorrect.
If the voltage is correct, this is an indication that the fault was present previously but is not active at the moment, i.e. an intermittent fault.

Hint: This diagnostic trouble code can be stored if a battery charger with too high charge voltage has been connected.






Continue - Checking the component

-------------------------------------------------

Checking the component




- Ignition off.
Check the generator (GEN) brushes (carbon). 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 carbon 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).

Hint: Another test to check the alternator's function is to perform Quick test of alternator function. Found in VIDA vehicle communication under Central electronic module (CEM).

Remedy as necessary.

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





Continue - Verification

-------------------------------------------------

Verification




Verification

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








- Ignition off
- Reconnect the connectors, reinstall components etc.
- Start the engine
- Read off the battery voltage and the target value of the generator (GEN) charge voltage
- Load the battery by switching on high current consumers such as high beam and the blower fan etc.
Check that the battery voltage is approximately 13.5-14.9 V. Check that the battery voltage is approximately the same as the target value for the generator (GEN) charge. Try different engine speeds (RPM).





Is the function OK?

Yes - VERIFIED

No - VERIFICATION FAILED

------------------------

VERIFICATION FAILED - Fault-tracing information

VERIFIED - FAULT FOUND

-------------------------------------------------

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

------------------------

Attempt New Test - Checking battery voltage

-------------------------------------------------