Hello.
There are some problems with my friend's V8 right now. Unfortunately, at the moment, we have only guesses what could be the cause of this.
A brief overview of the problems:
- AI malfunction [see also [ <a href="http://www.audiv8.com/forum/showflat.php?Cat=&Board=v8forum_ger&Number=138943&page=0&view=collapsed&sb=5&o=&fpart=1" target="_blank">Temperature Warning/ Problem & OT-Ger/Lamda Probe</a> ]
*KI does not control the e-fan
*KI reports faults in the cooling system all the time
- Idle stability does not run ( correct ) [ measured according to repair guide ]
*Motor runs round
*Rotary gravitational knife wobbles very strongly in idle mode [ so in the range of approx. 250 rpm ]
- The lighting flickers
- there will probably be a few undetected mistakes ;-)
We suspect that high frequency [ 50KHz ] in the circuit leads to these disturbances.
After we noticed the flickering of the lighting, we took an oscilloscope and tried to check the alternator. An electronics technician noticed that the on-board voltage grid is equipped with a high frequency of 50KHz.
Since high frequency ICs and control units can interfere, the assumption is first of all that this can be the cause.
But now the question arises as to where the HF comes from. The electrician taps the alternator [ diodes/controller ], but can't confirm this 100 percent. The alternator's controller was changed a little more than a year ago. And the charge control lamp works quite normal, so when ignition is on, off when engine is running. The on-board voltage with running motor and without load is 14.2 volts, is therefore also in the standard range.
Since an exchange of an alternator is not exactly a walk and also costs a little money, we have some questions:
- Where can the HF come from?
- There's always talk of Lima's oscilloscope images on the net. Does someone have any that shows what/how/where is defective?
Well, I hope there's someone who can help us a little bit. Because in the workshops nobody seems to have such a right idea, resp. they just want to "just" turn on a new Lima.
Thank you very much for your efforts.
Greetings Matthias
Edited by Matthias
