This is a weird one.
First up, let me say I know all about code 42 and how the ecm and icm communicate etc and how you get a code 42 when an expected signal is not where it should be during the startup and running phases so I'm not really looking for info on that aspect of things.
When I start the car the first time of the day (usually in the morning going to work) the CE light comes on (pulled the code and it's 42). If I turn it off and remove the key for about 5 secs and try again then about 50% of the time the CE light will come on again and 50% it won't. If the light comes on and I turn it off, remove the key, wait another 5 secs or so and then restart it, pretty much 99% of the time the light will NOT come on and the car is fine for the rest of the day. I can drive it to work (10 miles), park it all day, get back in it and it's fine, No CE light. Next day, same thing.
So!
It only happens on the first start of the day.
It goes away after a couple of starts.
I have no other problems/CE light issues.
So I am trying to figure out, why only the first couple of starts of the day, it's not like the engine even has time to warm up so I don't think heat is a factor. But also, how the heck can I diagnose this. Since it only occurs for such a short time I am at a loss as to how I can diagnose it.
I guess I could take the 'replace every connector and wire' for this circuit approach as a start just to be sure (new icm in there too so I don't think it's that) but anyone got any ideas as to how I can really dignose it other than do ONE test per day!
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Dave
www.ltlfrari.com