QuestionQUESTION: roland, it says i had too many follow-ups so had to ask a new question! lol. in response to your question of turning the crank by hand to see the crank sensor voltage, tha haynes manual tells me to take all the plug wires off the cap, back probe the crank sensor wires and have someone crank the engine while looking for the voltage to fluctuate between .3 and 5 volts, so thats how i've been doing it. i was able to see the cam sensor voltage go up to 5 volts, so i assumed i'd see the same thing with the crank sensor. i'd already pulled the new crank sensor back out last night and the paper spacer was still intact, i'll probably pull it out again tonight and send this thread to the house e-mail in case you have any ideas. thanks. jon
ANSWER: I just mention the hand cranking because that is the way I have previously seen it to be described. It all depends on the time response capabilities of the meter you are using and the pulse rate from the flex plate that is being generated by the starter motor. If you do it by hand you should certainly see it if it is there.
Roland
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QUESTION: roland, i have ohmed the wires, nothing shorted to ground, each other, etc. I put all the wiring back together hoping i just wasnt looking at the crank sensor voltage right, dont know why i was hoping that, still wont go above .5 volts. i have around 11 volts at the single coil wire going into the distributor (charging battery). if i have my voltage at the coil, am i right to assume the ASD is working and if so, does that mean the crank sensor is working also? if the crank sensor wasnt working would the PCM still pass the 12 volts to the coil?
ANSWER: The ASD is closed by action of the PCM and the PCM will not activate the ASD without signal from both cam and the crank sensor. It could be that the ASD relay points are fused closed, but that would be shown if the relay remained closed beyond the first second or so after you turn the key to run. So I can't give you any other suggestion if you don't see any pulsing out of the crank sensor. The crank pulses are required to 'drive' the PCM to ground the other end of the spark coil primary wire which produces the spark voltage.
Roland
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QUESTION: so if there is 12 volts at the coil primary, it could still be a crank sensor issue? how does the coil get it's ground with only 1 wire? thanks for your help and patience.
Jon
AnswerThere should not be 12V at the dark green/orange wire (the single wire plug with 2 pins) unless the crank and cam sensors are both putting out signals when you are cranking over the engine (other that for about 1 second when you first turn the ignition to run).
That is because the PCM will not close the ASD relay (excepth for that 1 second) unless it gets pulses from those sensors. If there is 12v at that dark green/orange wire when you are cranking then there are presumably pulses from both sensors getting to the pcm, unless the ASD relay is stuck closed. On the coil ground question, the black/gray wire on pin 6 of the other plug is what the pcm pulses to ground in synchrony with the crank sensor pulses. The wire goes from pin 9 to pin 4 at the pcm, so check that for continuity, if you are getting a steady 12V while cranking on the dark green/orange.
Roland
