Was able to find a compatible EA/CC/ISC [N4/3] module to test in my car. Well, it worked for a while! Same thing after 6 trips or so: If the car is stopped after high speed driving and then into stop-go traffic for 10 mins or so, ASR light comes on. The engine heat builds to 100C or so when the key is switched on.

It was NOT the EA/CC/ISC module even though the codes seemed to point to it. Re-check the codes and they are still the same as reported previously.

Well, as joe p said, there’s two things left and my money is on the ETA, Electronic Throttle Actuator as the ‘bad-guy’! There’s not a hint of a DTC for the ETA so it just frosts you or should I say, burns you!

But until it’s fixed, I performed a little trick that was mentioned in one of the many ASR posts: connect pin 6 on the Diag Connector (38 pin) to pin 1 (ground). This forces the ASR module in the diagnostic mode and it returns the car to a normal accelerator pedal. In fact, in a short drive, the car seemed to have a bit more power. Probably my imagination. Of course you have NO ASR!

But now the ASR light is on. So to kill that, insulate pin 29 on connector 1 of the ABS/ASR [N30/1] module by using a strong but thin tape. The MIL signal comes from this module and lights the ASR lamp located in the IC. The ASR light will still light when the ignition is turned to position 1 but will go out after the car is started. No chance of it coming on. I don’t recommend this as a permanent fix but this will kill the glare of the very bright orange ASR light without pulling the IC and removing the lamp.

Now, I need to tackle the ETA and see what’s up with that unit. Any suggestions on how or where to look/measure for problems?

__________________
Regards . . . . JimF
-------------------
'94 S500 Cpe

Visit my Mercedes Web Page