still no start.
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1st Gear Member
Joined: Jun 2006
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still no start.
okay guys here it is again i have the same ploblem.
I check the coil, im getting power to the coil and out of the coil!
into the opti, but nothing coming out of the opi
New opit spark install.
thats it.
now i have hook up the opit spark and try to start the car and i wont start! i'm going to have my ICM checked at autozone and see what they say!
I check the coil, im getting power to the coil and out of the coil!
into the opti, but nothing coming out of the opi
New opit spark install.
thats it.
now i have hook up the opit spark and try to start the car and i wont start! i'm going to have my ICM checked at autozone and see what they say!
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1st Gear Member
Joined: Jun 2006
Posts: 269
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RE: still no start.
autozone tested the ICM, its good
what and how can i check next?
okay another thing i wanted to but was not sure about was testing A/C voltage from the PCM to the ICM. Book says to measure from terminal B while engine is cranking! it says if no voltage signal is precent, says to replace the PCM.
what and how can i check next?
okay another thing i wanted to but was not sure about was testing A/C voltage from the PCM to the ICM. Book says to measure from terminal B while engine is cranking! it says if no voltage signal is precent, says to replace the PCM.
Tech Droid
Joined: Aug 2005
Posts: 9,215
From: North East PA
RE: still no start.
If you are getting a good spark from the coil, then the ICM is good. The spark is not traveling through the opti. Which could mean the opti as not installed properly, or the cap & rotor may be bad.
PCM sends a control pulse (square wave) to the "B" terminal (white wire) on the ICM whenever it wants to fire a plug.
The "C" terminal on the ICM is always grounded.
The "A" terminals on the ICM connects to the "B" terminal on the coil which is connected to battery through fuse #11
The "D" terminal on the ICM connects to the "A" terminal on the coil.
The ICM gets a control pulse from the PCM and puts out a ground on the "D" terminal. Ground signal connects to the coil and the coil fires the high voltage spark. Spark travels in ignition wire through the cap to the opti rotor. Rotor make momentary connection with plug wire terminal in cap and spark travels to plug. If the rotor is not aligned with a plug wire terminal on the cap when the coil fires, the spark won't be able to go anywhere.
PCM sends a control pulse (square wave) to the "B" terminal (white wire) on the ICM whenever it wants to fire a plug.
The "C" terminal on the ICM is always grounded.
The "A" terminals on the ICM connects to the "B" terminal on the coil which is connected to battery through fuse #11
The "D" terminal on the ICM connects to the "A" terminal on the coil.
The ICM gets a control pulse from the PCM and puts out a ground on the "D" terminal. Ground signal connects to the coil and the coil fires the high voltage spark. Spark travels in ignition wire through the cap to the opti rotor. Rotor make momentary connection with plug wire terminal in cap and spark travels to plug. If the rotor is not aligned with a plug wire terminal on the cap when the coil fires, the spark won't be able to go anywhere.
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1st Gear Member
Joined: Jun 2006
Posts: 269
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RE: still no start.
okay i see what you are saying! well i just bought the opti so i could say that the opti is good and that maybe i installed it wrong! i'll double check tomorrow for correct installation. okay so i can iliminate the said of the ICM and coil. what about the wires that connect to the opti spark coming from the PCM?
One more thing it dosent matter if its not in TDC as long as the splines align?
Also pete i forgot to mention that i try to fire up the car with out the water pump install, dont know if that makes any difference.
One more thing it dosent matter if its not in TDC as long as the splines align?
Also pete i forgot to mention that i try to fire up the car with out the water pump install, dont know if that makes any difference.
ORIGINAL: z28pete
If you are getting a good spark from the coil, then the ICM is good. The spark is not traveling through the opti. Which could mean the opti as not installed properly, or the cap & rotor may be bad.
PCM sends a control pulse (square wave) to the "B" terminal (white wire) on the ICM whenever it wants to fire a plug.
The "C" terminal on the ICM is always grounded.
The "A" terminals on the ICM connects to the "B" terminal on the coil which is connected to battery through fuse #11
The "D" terminal on the ICM connects to the "A" terminal on the coil.
The ICM gets a control pulse from the PCM and puts out a ground on the "D" terminal. Ground signal connects to the coil and the coil fires the high voltage spark. Spark travels in ignition wire through the cap to the opti rotor. Rotor make momentary connection with plug wire terminal in cap and spark travels to plug. If the rotor is not aligned with a plug wire terminal on the cap when the coil fires, the spark won't be able to go anywhere.
If you are getting a good spark from the coil, then the ICM is good. The spark is not traveling through the opti. Which could mean the opti as not installed properly, or the cap & rotor may be bad.
PCM sends a control pulse (square wave) to the "B" terminal (white wire) on the ICM whenever it wants to fire a plug.
The "C" terminal on the ICM is always grounded.
The "A" terminals on the ICM connects to the "B" terminal on the coil which is connected to battery through fuse #11
The "D" terminal on the ICM connects to the "A" terminal on the coil.
The ICM gets a control pulse from the PCM and puts out a ground on the "D" terminal. Ground signal connects to the coil and the coil fires the high voltage spark. Spark travels in ignition wire through the cap to the opti rotor. Rotor make momentary connection with plug wire terminal in cap and spark travels to plug. If the rotor is not aligned with a plug wire terminal on the cap when the coil fires, the spark won't be able to go anywhere.
Tech Droid
Joined: Aug 2005
Posts: 9,215
From: North East PA
RE: still no start.
I believe you have a 94 which uses a splined shaft. The splines only align one way if they are not forced. However, they can be forced in the wrong way when bolting up the opti and causing damage to the opti. There is a set of wires from the opti to the PCM that provide crank and cam timing signals to the PCM. The PCM uses these signals to compute the position of each cylinder and the stroke that it is in so it can command when to fire plugs and injectors. Also make sure you good fule pressure and that the njectors are being fired. Use a Fi pressure gage and NOID lites to chck the injector firing. Check the two injector power fuses.
There is a test connector between the opti and PCM which can be unplugged an it allows to probe towards the PCm and towards the opti. Pin "A" has the low res signal from the opti, and Pin "B" carries the high res signal from the opti. Pin "D" is a reference connection (PCM) ground to the opti. Pin "C" is the power feed from PCM to opti. The power and ground feeds from PCM to opti are isolated from chassis ground and battery.
There is a test connector between the opti and PCM which can be unplugged an it allows to probe towards the PCm and towards the opti. Pin "A" has the low res signal from the opti, and Pin "B" carries the high res signal from the opti. Pin "D" is a reference connection (PCM) ground to the opti. Pin "C" is the power feed from PCM to opti. The power and ground feeds from PCM to opti are isolated from chassis ground and battery.
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1st Gear Member
Joined: Jun 2006
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RE: still no start.
Pete so by me getting spark at the coil that means that the distributor is sending the signal to the pcm the pcm is sending the pulse to terminal B and does its thing sends coil sends the spark, but the spark is lost at the distributor?
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1st Gear Member
Joined: Jun 2006
Posts: 269
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RE: still no start.
what kind of damage can be done to the opti spark?? i will check first thing tomorrow for correct installation!!
i had another question if the pcm is sending the pulse terminal B could i rule out the PCM from been bad?
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1st Gear Member
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RE: still no start.
okay here it is pete, now this is what i'm really not getting.
I know for a fact that i have fire at the coil. my question now is could it be that the coil is producing enough voltage!! for the voltage to go threw the cap to the rotor and not making it out the distributo!!!
The first thing that happens is as the cam turns, the optical section of the optispark picks up the signals by the rotation of the shutter wheel. The pulses are sent to the PCM via the optispark electrical harness. The PCM processes the signals along with other sensor input and determines the proper time for the coil to fire. The PCM sends a signal to the Ignition Control Module (ICM) and it, in turn, causes the coil to fire. The spark from the coil travels through the coil wire back to the secondary ignition section of the optispark (cap and rotor), to be distributed to the proper cylinder.
!!!!now PETE this is the part that gets me!!!
If the opti is never sending the signal to the PCM, the PCM will never send a signal to fire the coil.
!!!!now PETE this is the part that gets me!!!
If the opti is never sending the signal to the PCM, the PCM will never send a signal to fire the coil.
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1st Gear Member
Joined: Jun 2006
Posts: 269
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RE: still no start.
okay this is done the car is now officially running!
i had check for spark at the coil, the spark tester light was a little dimm, and and i thought about it and read more and more about how the opti works, well i decided to check the coil, and sure enough the secondary coil resistance was not enough, so i believe it was not producing enough voltage for the spark to go through the rotor out the cap. so yes the camaro is now running thanks ya for the help.!
i had check for spark at the coil, the spark tester light was a little dimm, and and i thought about it and read more and more about how the opti works, well i decided to check the coil, and sure enough the secondary coil resistance was not enough, so i believe it was not producing enough voltage for the spark to go through the rotor out the cap. so yes the camaro is now running thanks ya for the help.!
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