Guys, this is the only fault code I came up with on my 16 port block..Socket 4 Fault 7. Starter Ring Gear Speed Sensor (L-3)? Can someone shed some light on this issue, THANKS!!!! Frank in VA.

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I had that at one point I loosened the wire as it was installed too tight and was pulling on the connector. Under side of passanger side by the fly wheel. Did you clear the code and check latter?

I did, keeps coming up...7 blinks, on pin 4. This PIC shows L-3 on the other side then what your saying??? wILL DOUBLE CHECK..see if I can find, and report back! THANKS!

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Yes I recall reading the pamphlet you illustrated and was surprised it was on the passenger side. Further into that manual describes a lengthy procedure how to check the sensor and circuit. It took me about 5 years to realize mine never worked. Once I did check the codes and investigated further it was a simple matter of relocating the tie down to give the cable some slack. That's when I realized I had a fast idle when the engine was cold. I'm sure glad I didn't have to proceed and go through that process to determine what was wrong. Is it giving you a major concern that you have a code?

My concern is NOT knowing what the issue really is, according to the fault code. I think your meaning the drivers side, that is what the illustration shows. I looked and looked didn't see anything that resembles L3. So far I don't know what the sensor looks like, or where it is, or what it does? Is it part of the turbo boost system, or something else? thanks!

just found this over @ 124 performance..gives more more clarity.

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speed starter ring gear sensor.pdf (683.5 KB, 320 views)

I definitely located my ring gear sensor on the passanger side 1992 602.124 when I replaced my head gasket back in April this year. It has around about an inch diameter connector. If you change your own oil next time you have your belly pan off from under the car look up by the exhaust pipe where the transmission and engine join together. Not 100% certain if the transmission belly pan has to come off also.

The function as I understand it is 2 fold one to control the EGR vacuum system and two to control the engine idle speed. I also understand it maybe used for the tach but when ime was throwing the code the tach still was functional. Once I managed to clear the code the hi low idle speed finally worked. I run with the EGR delete so no change there.

Looked and looked and it's NOT at all like the PIC shows. I found the connector @ the right of the battery, standing at the front of the engine, left, passenger side. I followed the wire over, around oil filter, down over starter and under to the side of the flywheel (driver's side). I think it counts, the teeth on the flywheel, rpm, to tell EDS what to do. Mine is covered in OIL, all nasty, and I need to remove check the ohms, and see whats up with it. I did disconnect it @ the connector, and it looked fine there, code still comes up. MB calls it the ring gear speed sensor, so the ring gear must be the flywheel.

It's an inductive pickup on the fly wheel is a magnet attached so one pulse is given for each revolution it is a low voltage signal which is meaningless without a frequency counter or frequency divider. It relays on a changing magnetic field to generat the ac wave form. Would be interested if your tach works with it disconnected?

No tach didn't work when unplugged. Had a hard time getting right part, but finally did. Hardest part was weaving the cable in place! Got it back together and the code cleared on pin block 4, #7. Come to find out this RPM sensor plays a major roll with a lot of things working or not working right, from turbo boost to the AC compressor coming on, to name 2. Problem SOLVED.

Good work FM900 news to me about the AC using this signal also.