PeachParts Mercedes-Benz Forum - View Single Post - A/C quit.....2001 e320 Wagon. 4 matic. amongst other things !

joe p · #2 03-20-2004, 09:52 AM

Look hard at the a/f meter. The 112 engines are kinda hard on 'em and they are less expensive than O2's.

On the ACC with a leak and a ec light flash I'd check the refridgerant temp sensor in the dryer for function. I'd also find something that'll check the codes, the ACC panel is capable of displaying these but, I do not have the procedure, search around on the net, I'm sure its out there. (I've got a sds, dont need that)

The MTG2500 should read the air flow sensor in hg, if it will the car should idle around 16 and hit 350-400 momentarlily on the rev limiter. The rev limiter is also a pretty fast cycle (about as fast as the "no fault flash out" on a Lexus Trac or ABS system on the early cars.) If it's lazy on the limiter and while driving it fairly briskly its feels like it has a slight surge on accel definetly give the air flow meter the hairly eyeball and check the intake air horn for broken clips and or leaks.

Ignore the IC code, thats pretty much normal. Which code has the freeze frame data for it? Thats the one that set the light and is the first on to try and fix. The rear o2's should be pretty stable at around .450 v, the fronts will cycle from .2 to .8 fairly quickly. (the 2500 is too slow of a interface to realy see the cycle accurately)

The 112 ME2 mills aren't too difficult to work with and are pretty forgiving with the excetion of the trim codes and occassional o2 codes for a/f meters. When you replace the meter be sure to let it idle awhile for readjusting the self adaptation and then drive the **** out of it for 10-15 miles to finish the job. Either that or find something capable of resetting selfadaptation stand alone, it'll run "funky" at first with a new meter.

Joe