1995 E320, 90,000 miles, engine wiring harness replaced.

Cruise control completely inop. idle to low--about 500 rpm--occasionally dies when power steering loaded or ac cycled on.

CEL on, code 6 (Idle speed control faulty) Can clear but will come back within a day or so.
PIN 8 code 8 (Idle speed control at upper or lower control stop--limp mode does not appear to be active)
PIN 14 code 2 (2 EA/CC/ISC control module (N4/1) or Safety contact switch (M16/1s1) or Stop lamp switch or Cruise control switch or Actual value potentiometer or Starter lock-out/back-up lamp switch or engine speed signal or vehicle speed signal or closed throttle position switch or safety relay in EA/CC/ISC control module)

PIN 6 code 3, 4, 8 (don't have look up table for these)

checked stop lamp switch above brake pedal--appears OK

Dealer says: HFM SFI diagnosis: possible cause intake air leak or throttle valve binding

Is this the dreaded throttle actuator problem?

Just another related question: If a CEL fault is present but cleared without fixing the problem, how many times must the same problem be sensed prior to the CEL coming on again? It seems like the CEL comes back on after about 5 start/shutdown cycles. Anybody know the answer?

Miscellaneous comments - PIN 6 is SRS so it's a safe bet those are unrelated - I would just clear them and forget about them for now. The PIN 14, #2 code you've picked up is for a car with ASR. Do you in fact have ASR? The brake lamp switch is only about $15 - if it's original it may not be a bad idea to replace it anyway. It does sound engine/throttle actuator related but it's too soon to panic.

What exactly is ASR (is it automatic slip reduction?) and how would I know if I have it?

Thanks

Retards (backs off) the throttle if the wheels spin out (slip). You would have an orange/yellow triangle that comes on with the bulb test or if the wheels start to spin, and also with the bulb test you's see a warning light, I believe red square, with ASR on it.
Gilly

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Yes you have a dead thottle accuator. If your wiring was bad on the harness it will be bad on this as well. I had the exact same problems, low idle, AC wouldn't work due to low idle and of course no cruise control. I purchased mine (noted in other posts) from www.4mercedes.com for $400.00 with a 1 year warranty. Best of luck and let us know how it turns out.

Chris

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