Steve, the transmission may be 722.4 so your confirmation that it should not talk to trans is very helpful.

The connector I am using is the MB-1 which is a 38pin cable connector cable that interfaces with the 38pin under hood connector. HFM should be on pin 4 of the 38 pin underhood connector. I back probed pin 4 on the 38 pin Diag connector with the scanner connected with Fluke 88V and there is signal burst indication when the MT2500 attempts communicating. But it always returns "No communication" error, KOEO or KOER.

The model is before 8/96 so this should be HFM. It was my understanding that ME was introduced after that date.

Should the HFM be talking to the MT2500 if there is a DM? Are there common faults that are associated with no comm with the HFM?

Steve your experienced assistance is much appreciated.


Thanks

__________________
Martineau Gauda
mgauda@sprintmail.com

96 C280 Mercedes
82 Rolls Royce Silver Spur