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Old 03-27-2013, 03:44 PM   #2 (permalink)
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I believe it's some combination of:
Coolant temp, intake air temp, RPM, manifold pressure (proxy for engine load), throttle position, and possibly a few other factors.

Have you been able to chase down a good manual for your car? The factory manual or equivalent should lay out the conditions. There are places you can download factory-type manuals for various Honda products; not sure if the VX one is in that list.

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