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MG88
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Hi niceguy not sure if your problem is similar to what I had. In regards to the fans they might be on even after the engines is off if the engine compartment or cooling water is hot enough. As I remember there is one engine compartment fan and 2 fans in the front to cool the water. As it turns out my problem was due to a faulty RPM sensor. It was just coincidence that the car would work after resetting the codes, it started stalling after another hour or so of driving. I gave up and brought it in for repair. Marvin at the Rennshop helped me out, he did an excellent diagnostics job :D .
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So I had some time and played around with it again. I found that the engine actually stopped if it was warm enough ~220F per instrument cluster. Once the engine stopped I got P1571 Immobilizer and then also P1790 on a later try. Anyhow I thought maybe DME or Tiptronic module are getting to hot, they were actually cooking but maybe that's normal? I cleared all codes with Durametric SW and problem was gone <_< B) . Don't know why and what but the car starts normally now when warm and I let it run for 1h and no unexpected shutdowns. Now symptoms are gone, rootcause is unknown and I'll be driving with my laptop in case I have to reset codes again.
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Thanks Loren and Rockymount1, I've read the service manual a little more today and found that these regulators are within the tiptronic tranny on the hydrolic control module - oops - so getting them out will be interesting. I checked Pins 52 vs 1,4,5,29 for continuity and short to B+ on TCM connector but they seem to be fine, all around 8.5 ohm. Now that was with cold engine, I check again tomorrow after driving around for a while. Since I don't have a spare TCM I'm not sure how to verify if that's the problem - any ideas? But I'm still wondering if the "no start" with warm engine is caused by problems with the pressure control solenoids - now the service manual "thinks" that a fault here would cause a "reduced driving program" - that doesn't sound like it would cause start up problems - then again my understanding here is quite limited :).
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Recently I stepped out of my '00 boxster for a couple of minutes after driving 15 miles or so and found that I couldn't start the car again. Engine turns over nicely but no start :huh: . After a while though the car started normally. Since then this happened a number of times and usually after the engine cools down somewhat it will start again. Checked fault codes with Durametric SW and found P1818 and P1823 codes. Couldn't find these in my Boxster service manual but luckily they are here in the P-codes section. I also tried to reset ECU by disconnecting battery (-), that seamed to have worked the first time, but then it wouldn't help anymore afterwards. (not sure if that was coincidence) So now I'm stuck, not sure if these codes are related to the problem - anybody has an idea?