How does PCM know engine is running?
#2
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The PCM indirectly senses that the engine is running from several indications: RPM from the crankshaft position sensor, oil pressure, manifold absolute pressure among others. However, there is no discrete output that says running = 0 (no) or running = 1 (yes). In fact when you crank the engine either directly by the ignition switch or remotely via a remote starter, you have to decide when to release or disengage the starter.
Steve
If you had a vacuum operated switch that opened when the vacuum exceed a certain amount (like 20" Hg), then you could have that switch in series with your remote starter switch. Why not just buy a commercially available, no frills, remote start switch kit?
Steve
If you had a vacuum operated switch that opened when the vacuum exceed a certain amount (like 20" Hg), then you could have that switch in series with your remote starter switch. Why not just buy a commercially available, no frills, remote start switch kit?
#3
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An oilpresssure switch such as the ones used on ford vehicles for the oil pressure gauges, that turn on at 6psi would be one method, but it would just work for preventing accidental pushing of the starter with the motor running, not to stop the cranking circuit from running the starter once the motor is running.
If you are really really good with electronics and programming, there is a "time running" function available through the OBD2 port, that could be used, but it is probaly far too complex for what you are looking to do.
Ryan
If you are really really good with electronics and programming, there is a "time running" function available through the OBD2 port, that could be used, but it is probaly far too complex for what you are looking to do.
Ryan
#4
Originally Posted by Steve Bryant
Why not just buy a commercially available, no frills, remote start switch kit?