03 Hyundai Sonata; could not shift out of park unless you started the car first. If you stalled while in any gear or neutral you could still push the car. But if stalled and you put it in park you were stuck in park until the car was started. I never had the experience of a stalled car so I couldn't tell you if it was possible to attempt to start it (and fail) and still take it out of park.
09 Toyota Venza, same scenario.
17 Tacoma, same scenario.
Many rental cars could not be started unless you were in park or neutral. If parked and in park, you had to step on the brake pedal before the car would start, and you couldn't take it out of park unless you've started the car. I've had only one experience where I stepped on the brakes, pushed the start button and quickly shifted out of park before the engine started. So in that instance (and possibly all others) you COULD get the car out of park.
But this leads me to think that a simple microswitch installed in the shift lever housing could detect when the shifter is in park. Only then could you could get a signal that you were NOT in park. But that wouldn't necessarily mean the engine was running. The best thing I've read so far was an oil pressure sensor light switch on the engine block. When the oil pressure is low or at zero the switch closes, which would indicate no oil pressure; which is usually a pretty good indicator of an engine not running. When the pressure comes up the oil pressure switch opens, and thus turns off the light. However, those systems are opposite of what I think the TS wants. But it can still be used via a relay to trigger a switch for a high signal when the engine is running. But then again, it's possible the switch is powered the moment the key is turned, thus, once again, giving a false indication.
It's complicated. Perhaps an auxiliary crank shaft position sensor would indicate when the engine is either cranking or running. So maybe the best solution is a delay circuit, sort of like the one I posted in post #4. Messing with the capacitance and resistance will alter the time delay of the relay energizing, which in my case was about 4 seconds. Long enough to crank the engine without activating other circuitry before or while the engine is cranking.
Been reading other posts similar to this one and a lot of information has gotten confusing for me. I'll have to re-examine this thread and try to determine exactly what the TS wants to accomplish. So if I'm a little off base, give me a chance to catch up.
09 Toyota Venza, same scenario.
17 Tacoma, same scenario.
Many rental cars could not be started unless you were in park or neutral. If parked and in park, you had to step on the brake pedal before the car would start, and you couldn't take it out of park unless you've started the car. I've had only one experience where I stepped on the brakes, pushed the start button and quickly shifted out of park before the engine started. So in that instance (and possibly all others) you COULD get the car out of park.
But this leads me to think that a simple microswitch installed in the shift lever housing could detect when the shifter is in park. Only then could you could get a signal that you were NOT in park. But that wouldn't necessarily mean the engine was running. The best thing I've read so far was an oil pressure sensor light switch on the engine block. When the oil pressure is low or at zero the switch closes, which would indicate no oil pressure; which is usually a pretty good indicator of an engine not running. When the pressure comes up the oil pressure switch opens, and thus turns off the light. However, those systems are opposite of what I think the TS wants. But it can still be used via a relay to trigger a switch for a high signal when the engine is running. But then again, it's possible the switch is powered the moment the key is turned, thus, once again, giving a false indication.
It's complicated. Perhaps an auxiliary crank shaft position sensor would indicate when the engine is either cranking or running. So maybe the best solution is a delay circuit, sort of like the one I posted in post #4. Messing with the capacitance and resistance will alter the time delay of the relay energizing, which in my case was about 4 seconds. Long enough to crank the engine without activating other circuitry before or while the engine is cranking.
Been reading other posts similar to this one and a lot of information has gotten confusing for me. I'll have to re-examine this thread and try to determine exactly what the TS wants to accomplish. So if I'm a little off base, give me a chance to catch up.