Aside from the connectors, sparkplugs and coil. What other part can cause this codes? Can it be voltage regulator or battery?


Car idles good. No fluctuations during idle, constant 800rpm.

Thank you for the advice A.D. !
We found the VR as the culprit for the codes.

hey tankwagon,

could you be a bit more specific

were all three codes(21,22,23) showing up together at the same time, or would they come up individually? and how often were these codes appearing?

the voltage regulator that you are referring to , is it the one located on the back of the alternator, or is there another one of these VR's located elsewhere?

could you please provide the testing procedure, and any other useful details?

thanks

Is that the VR or the OVR?

Codes 21,22,23 all showed up at the same time. Voltage across battery (engine running) was below 12.6volts. Interstate MTP Battery was new.
Inspected the voltage regulator (back of alternator), the bushing were worn down. The VR was replaced. After VR was replaced, voltage across battery (engine running) was at 13.8volts. Codes were cleared. It's been 6 months , no codes 21,22,23.

Used Voltmeter to test voltage.

Hope this helps.

hello tankwagon,

thanks for the reply . I'm sure your info will come in handy sooner or later.

in the following link there are a list of symptoms/engine components that can be affected by a bad VR, resulting in too high a voltage:
http://www.peachparts.com/shopforum/showthread.php?t=121404


just out of curiosity, at what mileage did the faulty VR/Low voltage problem arise?



thanks

214,000miles. It has the Original Alternator. Further inspection on the alternator showed bearing was still good, only the VR brushes that are worn down. Since replacing the VR brushes, no codes 21,22,23.

Many thanks Tankwagon!

thanks again for the info.

found out a few additional things:

according to the FSM alternator voltage output should be in the 13V-14.5V range, no more or no less.

Unfortunately i couldnt find all of the minimum brush lengths for the 300E, which supposedly has 3 different alternators: 55A, 70A, and 80A. However i did manage to find out that the 55A alternators have a minimum brush length of 5mm, but am not sure if the same applies to the other 2 alternators? So, if any one knows , please post the info.

thanks to all