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Re: Weird electrical issues. Posted by Ari [Email] (#2847) [Profile/Gallery] (more from Ari) on Tue, 6 May 2008 06:16:27 In Reply to: Weird electrical issues., John, Mon, 5 May 2008 17:29:09 Members do not see ads below this line. - Help Keep This Site Online - Signup |
The fan on the cabin air sensor (bulls-eye) does not shut off when the car shuts off. It stays on for 5-10 minutes after shutoff. The idea is that if you hop out of the car for a quick errand, the sensor will still be recording cabin temperature, so when you get back in, it sets the ACC temp right. As an example, on a hot day, it's pretty warm in the dash, but the cabin can be cool. Hop out for 5 minutes to gas up the tank, and if the fan weren't running, the sensor would heat-soak and you'd get the ACC at full when you get in.
I assume it isn't on when you get into the car, so it shut off at some point. You just need to wait a bit longer.
When you say airbag, as the others have mentioned, we're assuming it's the Passenger side airbag. The flasher relay is located in the relay panel, just behind the airbag. You drop the fuse panel to access it. My guess is that the relay is a little loose.
As the others have noted, the MPG will drop to 0 when the car is stopped and idling. And yes, it pulls down the average MPG, as it should. The engine is using fuel and you aren't moving, so the average is dropping. I've never had much luck with the accuracy of that system - I always track fuel mileage by miles between fill-ups, also accounting for trip types (mostly around-town, long highway, etc.).
The instantaneous MPG display is not precise. It does get distance, but fuel consumption is a guess. The ECU sends a signal to the EDU (display) telling it how long the fuel injectors are open, and the EDU makes an educated guess on how much fuel is squirting out. I'm not sure if fuel pressure is taken into account. I think the average may be based on mileage and fuel level sensor readings, but I'm not sure. Summing up the instantaneous readings would compound error, but that might be the way they do it. I'd have to check.
Either way - have you seen a drop in miles driven divided by fuel put into the tank?
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