This is a no-start problem. Car was driven about a week ago and all seemed fine. Tried to start engine in the heavy rain a few days ago, the engine cranks over strongly, idiot lights are good on the dash during cranking (good ign switch) but engine will not start! No DTC faults relating to a no-start problem, just one dealing with the Secondary Air Pump system. (vag-com tool)
part # 021 906 259K (Bosch 0 261 204 263/264)
The current ECM is not firing the coil pack (1 year old BERU). I tried another working coil pack. I checked power and ground at the coil pack plug (GOOD) and even checked the wiring from the ECM to the coil and it is fine. I even tried an ign coil from a 2.0 ALL COILS DID NOT SPARK STRONGLY! With the 2.0 coil hooked up I could just barely see the tinest spark in the dark.
I checked the ecm firing of the sets of sparks with an LED light and it flickers but very faintly. With the 2.0 coil hooked up I could manually ground it's center terminal and it had a very nice strong spark.
Conclusion.............Bad ECM or Bad Grounding system through for the coil pack. Bentley concluded that it is the ECM!
I am currently studying the Bentley to see if I can tell where the grounds are for the ECM.
But just in case I will need an ECM does anyone have a good one to sell? Suggestions are welcomed too! TIA
later, dave (One out of many Daves)