2000 Ram Van 3500 - Crank but won't start
#11
Well, we have progress, but not success yet. I replaced the crank sensor ( and the air filter while I was in there ) this morning.
Now I get the initial relay engagement ( just as before ), and while cranking the relays both re-engage. When I stop cranking, the relays stay engaged for approx 2 seconds, then release. So the PCM seems to be getting all the correct inputs, and doing its job properly.
It seems to be cranking strong still, but does not start. So off to learn how to ensure I'm getting spark, as that seems to be the next place to investigate.
Now I get the initial relay engagement ( just as before ), and while cranking the relays both re-engage. When I stop cranking, the relays stay engaged for approx 2 seconds, then release. So the PCM seems to be getting all the correct inputs, and doing its job properly.
It seems to be cranking strong still, but does not start. So off to learn how to ensure I'm getting spark, as that seems to be the next place to investigate.
#12
Yep, if you have another warm body available, use a pair of INSULATED pliers, to hold the coil wire just above the coil, while your warm body cranks the engine. (I have used my unlicensed grandkids for this exercise..... don't have to be real old to turn a key. ) If you are getting spark, it will jump a small gap, but, not a huge one. Also, the coil packs a wallop, so, make sure that YOU aren't the easiest ground path for the spark.
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#15
[QUOTE=HeyYou;3554142]Something to the tune of 40,000 volts. That should blow your meter up quite nicely.
Well, don't want that
I picked up a tester at the local shop, and I do not have spark on my old ignition coil nor my new ignition coil. I do get the 12 volts on pin 1, each time the ASR is engaged, and off when it released. So that circuit looks to be working just fine. So I tested across pin 1 & 2 with my volt meter ( and my continuity tester ) and neither are giving me a reading. Something is wrong on the ground side of the circuit. It looks to me from wire diagram, that ground comes from the PCM. So my conclusion is the PCM is not sending ground to pin 2, and so my ignition coil is not being told to turn on from the computer.
Can I ground out pin 2, leaving the coil with constant 12 volts as a test? Or does the PCM send ground each time the coil is to fire off? ( I guess a different way to ask is : Is the coil constantly charged, or does the computer turn it on / off for each spark? )
Well, don't want that
I picked up a tester at the local shop, and I do not have spark on my old ignition coil nor my new ignition coil. I do get the 12 volts on pin 1, each time the ASR is engaged, and off when it released. So that circuit looks to be working just fine. So I tested across pin 1 & 2 with my volt meter ( and my continuity tester ) and neither are giving me a reading. Something is wrong on the ground side of the circuit. It looks to me from wire diagram, that ground comes from the PCM. So my conclusion is the PCM is not sending ground to pin 2, and so my ignition coil is not being told to turn on from the computer.
Can I ground out pin 2, leaving the coil with constant 12 volts as a test? Or does the PCM send ground each time the coil is to fire off? ( I guess a different way to ask is : Is the coil constantly charged, or does the computer turn it on / off for each spark? )
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rhennick (01-22-2024)
#18
#19
Can I really test that my coil gets grounded ok with a meter, or does the PCM send ground only in short intervals?
#20