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Old 08-24-2010, 11:46 AM   #21 (permalink)
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I must be a little slow, why would you want to shut off the injectors?

Dosn't the ECU shut them down when coasting?

I know that even in a 1982 Camaro the injectors shut off after 5 seconds of rolling with a no throttle condition, and come back on as soon as you take off.


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Old 09-24-2010, 03:37 PM   #22 (permalink)
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Niner_xA - '05 Scion xA
90 day: 35.82 mpg (US)

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The engine will shut down the injectors when coasting with an automatic or the manual in gear, but that will also use the rotational force of the engine turning to "brake" the car. By putting the transmission in neutral and shutting off the engine, you are able to coast longer. You can key off and then back on, although this turns off other stuff as well (and you have the same caveat - turn back on too fast and the engine keeps running).

I have the xA and the schematic looks similar. The single 15A fuse that powers the injectors also supplies power to just about everything else in the ECU. In fact, that fuse feeds the ignition switch, so it would be the equivalent of taking the key completely off - no acc power either. I am not sure if I'm going to try and follow the black/red wires back to where they're joined or not; I may try and cheat and follow the black/red wire out of the ignition switch.

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