96 blazer replaced valve spring now no fire!
#11
The Ignition Control Module, ignition coil, and crankshaft position sensor all get voltage from the same fuse on your 1996, (ECM IGN fuse #10, 20 amp fuse in the instrument panel fuse panel). If you don't have voltage at all three, the pink wire is broken somewhere. In a pinch you could run a jumper wire to supply voltage where it's missing.
EDIT: Only way to do the relearn is with a scan tool that can initiate it. The engine might run without doing the relearn, but the data that the PCM uses will be from the last relearn....with the old crank sensor.
EDIT: Only way to do the relearn is with a scan tool that can initiate it. The engine might run without doing the relearn, but the data that the PCM uses will be from the last relearn....with the old crank sensor.
Last edited by Captain Hook; 07-17-2012 at 05:59 PM.
#12
The Ignition Control Module, ignition coil, and crankshaft position sensor all get voltage from the same fuse on your 1996, (ECM IGN fuse #10, 20 amp fuse in the instrument panel fuse panel). If you don't have voltage at all three, the pink wire is broken somewhere. In a pinch you could run a jumper wire to supply voltage where it's missing.
EDIT: Only way to do the relearn is with a scan tool that can initiate it. The engine might run without doing the relearn, but the data that the PCM uses will be from the last relearn....with the old crank sensor.
EDIT: Only way to do the relearn is with a scan tool that can initiate it. The engine might run without doing the relearn, but the data that the PCM uses will be from the last relearn....with the old crank sensor.
#13
If the pink wire at the ignition control module has battery voltage in START and RUN positions, and the ignition coil and crankshaft position sensor do not, you can run a wire from the pink wire at the ICM to the pink wire at the crank sensor & ignition coil.
#14
ok i had a wire running from the pink wire from the icm to the pink wire on the coil then to the crank sensor and still nothing this has me clueless haha ive never had a 4.3 do this to me
Last edited by liljde; 07-17-2012 at 06:51 PM. Reason: tried the steps
#16
ok correction i didnt have to jump the crank sensor it already has power as dose the icm just no power at all to the coil even when i jump the pink wire with the icm there is still no power could it be that the coil pack bracket is not properly grounded on the intake? because with a live hot added to the dead one im still not getting any voltage with the coil pack
Last edited by liljde; 07-17-2012 at 07:19 PM.
#17
The coil does not need to be grounded. The pink wire supplies positive voltage to the coil in the start and run positions. The ignition control module supplies a ground pulse on the white with black stripe wire to fire the coil.
Do you have a test light? If so, connect the ground lead to battery positive and the test light probe to the white with black stripe wire and crank the engine. The test light should blink while cranking.
Do you have a test light? If so, connect the ground lead to battery positive and the test light probe to the white with black stripe wire and crank the engine. The test light should blink while cranking.
#18
The coil does not need to be grounded. The pink wire supplies positive voltage to the coil in the start and run positions. The ignition control module supplies a ground pulse on the white with black stripe wire to fire the coil.
Do you have a test light? If so, connect the ground lead to battery positive and the test light probe to the white with black stripe wire and crank the engine. The test light should blink while cranking.
Do you have a test light? If so, connect the ground lead to battery positive and the test light probe to the white with black stripe wire and crank the engine. The test light should blink while cranking.
#19
If the light stays on, and doesn't blink while cranking, the ignition control module is not supplying ground to the coil. What you are seeing is the battery voltage going in the coil on the pink wire, and coming out on the white with black stripe. If it doesn't get grounded in the ICM, the light will not blink. Either the ICM is not getting a signal from the PCM telling it to fire the coil, or the ICM can not supply ground to the coil.
The way the ignition circuits work is the crank sensor sends a signal to the PCM, the PCM sends a signal to the ICM on the white wire, and the ICM sends a ground pulse on the white with black stripe wire to fire the coil. There are a couple of things that can cause what you have going on: Could be the ignition control module is faulty, could be a bad ground to the ICM, could be a problem with the crankshaft position sensor, and or its wiring back to the PCM, or, though not likely, a problem with the PCM.
EDIT: Do you have, and know how to use, a digital volt ohm meter?
The way the ignition circuits work is the crank sensor sends a signal to the PCM, the PCM sends a signal to the ICM on the white wire, and the ICM sends a ground pulse on the white with black stripe wire to fire the coil. There are a couple of things that can cause what you have going on: Could be the ignition control module is faulty, could be a bad ground to the ICM, could be a problem with the crankshaft position sensor, and or its wiring back to the PCM, or, though not likely, a problem with the PCM.
EDIT: Do you have, and know how to use, a digital volt ohm meter?
Last edited by Captain Hook; 07-17-2012 at 08:36 PM.
#20
EDIT: Do you have, and know how to use, a digital volt ohm meter?[/QUOTE]
yes i do and i really appreciate your help ive tried just about everything i even changed the icm and made sure it had a good ground still nothing lol i think im just goinmg to post it on craigslist haha wished i could pay you to come take a look at it xD
yes i do and i really appreciate your help ive tried just about everything i even changed the icm and made sure it had a good ground still nothing lol i think im just goinmg to post it on craigslist haha wished i could pay you to come take a look at it xD