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When testing items like MAP sensor, I have on occasion wanted to estimate expected voltage drops across different resistances, or expected resistances for a voltage drop in the ECU sensor circuits. However, I don't know if the current is constant in these circuits, and i.e. there's the rub!
I know that at the extremes, limits, the current can not be constant, like 1 meg ohm versus 100 ohms, versus maybe .01 ohms. But what about 10 ohms versus 500 ohms? I would expect that there is a current limit in the ECU/PCM computers, but that is where my knowledge ends. Do any of the EEs here have any idea how to talking coming up with engineering estimates for this, and ideas as to what and how the ECU/PCM black boxes function. Wheatstone bridge comes to mind, I am not sure if the have a constant current control feeding them, or what? My guess is they are current limited. So once again, short of just collecting imperical block box and sensor data, I am clueless in Houston! LOL
Merry Christmas !!!!:sunshine:
I know that at the extremes, limits, the current can not be constant, like 1 meg ohm versus 100 ohms, versus maybe .01 ohms. But what about 10 ohms versus 500 ohms? I would expect that there is a current limit in the ECU/PCM computers, but that is where my knowledge ends. Do any of the EEs here have any idea how to talking coming up with engineering estimates for this, and ideas as to what and how the ECU/PCM black boxes function. Wheatstone bridge comes to mind, I am not sure if the have a constant current control feeding them, or what? My guess is they are current limited. So once again, short of just collecting imperical block box and sensor data, I am clueless in Houston! LOL
Merry Christmas !!!!:sunshine: