Ok, got the file thanks. It does have some odd things in it though. We can see from the trace that the engine stops running at 2:41 and the ECU stops at 3:20. We can see that 2:38 you have the throttle wide open trying to keep the engine running, but the RPM drops to zero 3 seconds later.
1. There is something wrong with the alternator. All of my logs (and AndyW's) we get a fixed voltage around 13.7V +/- 0.1V until the engine stops, at which point it drops down to 12.6V, the sign of a charged battery. Yours looks very poor, starts at 13.1V dropping to 12.4V before stabilising at 13.0V. But at 2:25, 16 seconds before the engine stops, something very weird happens, the voltage starts to drop and it is at 12.4V when the engine stops but continues down to 11V before the ECU switches off. Very suspicious.
2. When the engine stops the stepper motor should reset the IAC (Inlet Air Control) position back to the idle. As you can see from the side-by-side pictures, mine does that but yours doesn't. Might explain your difficulty in restarting. However, this may be because you do not turn off the ignition so that might be a red herring. If you close the engine down normally do you hear the clicking of the stepper motor?
3. Not sure what to make of this one, but we have one of the parameters that we aren't sure of, but it has been suggested it is the fuel/air ratio. On my car that has never varied from 145 (14.5 to 1.0 ?) but as you can see from the picture, at the instant your problem occured it suddenly took a sharp dip. No idea what that means.
4. There is a byte that we refer to as Long Term Fuel Trim, although I am not personally convinced. The default setting is 128 (256/2). Mine used to be 119 but over the years has gradually drifted down to 112. I see yours is 108, which seems a bit low.
And finally we have your Air Temp Sensor failure light. It seems a bit odd, as we can see that the ECU is actually registering a temperature. However, on all my log files the Intake Air Temperature and the Fuel Temperature generally follow each other. On yours they are radically different. In fact at the start of the run the Intake Air Temperature is showing as 95 deg C and then comes down instead of up. I think that is highly unlikely But I assume you see the same behaviour with the sensor disconnected ?
Everything else seems OK. So not much help really although I find the alternator behaviour a bit worrying and I know you have had problems with it before. Send me any more log files you do so we can see if there is a pattern.
Cheers
Al
Area Secretary
