If you find anything bad, fix it. Leave nothing to chance.

 

I understand that, the schematic shows that they are linked together, the ICM/Opti/Crank Sensor, so the problem has to be either in that wiring or the optical side of the opti, so after I fix the wiring then Ill move to the opti, but thats the only thing I can say. Thanks

But is it true the high voltage reading is coming from the optical side of the opti?

 

Do you mean the P1351? That is strictly the circuit from the PCM to the ICM. It means the white wire is open or intermittently so. When it is open, the PCM sees the voltage as abnormally high, because the component that is on the other end is providing no load. It does not mean that when you test the wire, you will see high voltage.

 

Okay if that its true, what is the component on the other end? The ICM? Ill check the white wire but dont think anything is wrong with it. I have an extra PCM, plugged it in and it runs the same so its not the PCM. It could be those pigtails that are grounding off or something and causing the ICM to read that.

 

One end PCM, other end ICM. No, not grounding, but open. That is the reason for the high voltage DTC. The ICM does not read/monitor voltage, the PCM does.

 

Did you ever look at the DTC 41 code logic tree in the shop manual?

 

The 1351 has nothing to do with the opti. It is from an anomily on the white wire from the PCM to the ICM. But it is only during cranking. If there is a problem that remains on that same line while the engine is running, it could only be seen with a scope. Any meter would respond too slow.

There is no common link to the ICM/opti/CKP as you wrote. The closest thing to a link is 12 volt supply line that splits after the 10 amp ignition fuse to the ICM/coil/CKP. Certainly if this line were intermittently touching ground, misfires could occur.

You have to decide if you are going to investigate this as if the problem that set the 1351 is the same problem causing the misfires or not.

Then you also have to see if the misfires are causing a DTC300. I don't recall you mentioning the SES or a 300. If that is the case, could it have something to do with the supply line to the coil/ICM/CKP???????

Also, if the 12v supply line to the 3 devices was shorted to ground(albeit intermittent) you might expect a DTC336.

 

Actually, besides the common 12v supply to the ICM and CKP, the CKP has one terminal tied to the low reference signal wire that goes from the PCM to the opti. I am guessing this is what causes some people ignition problems when there is an electrical fault with the CKP or it's wiring.

 

The crankshaft position sensor is new also lol. I believe its just the wiring, I may just replace the white wire to resolve any problems with it and not having a scope. I ordered new pigtails for the crankshaft position sensor, and the optispark. The insulation was peeled off both pigtails at the connector and the CKP one of the lighter wires had about 1/4 showing which couldve grounded. I believe this is the cause of the problem. I will do this and then if it doesnt stop the misfire then I will replace the optical side of the opti.

So, Im going to try:

Replacing white wire
Replacing Pigtails (Opti and CKP)
Checking all other wiring
(and if this doesnt fix it then)
Replacing optical side of the opti

What do you think?

When I scanned it, the only codes present were the fan codes for 1,2, and 3. Then the 1441 I think which I fixed due to a broken wire at the plug. The 1351 is the only thing left, and when using the diagnostic tools, there was no 300 code present, but the scanner listed all misfires and they were still occuring on every cylinder.

I believe the 1351 is causing the misfire or could i be wrong???????

 

P1351 could cause the misfire.

 

Well the car was running great until this code came up.

 

Yeah but he said common to the ICM/opti/CKP. The line your speaking of is CKP/opti/PCM. The ICM isn't connected to it.

He should add a second wire temporary to the IC line externally. If that doesn't cure it, run a second temporary ground line to the ICM.

The only causes for the 1351 is PCM which we think is not the case.
The wiring which can be tested with a second line
The ICM or it's ground.

It also would not hurt to clean up the 2 major grounds to the PCM at the head near the ICM and above the starter.

 

Alright, the ground to the ICM is there, the ground by the starter is there.
The PCM isnt bad, put my spare PCM on it and does the same exact thing. ICM was replaced when the code came up, along with every other igntion component on the car including a MAP sensor.

Wiring Testing: So your saying I could tap the white wire by putting a wire at the ICM then connect it to the PCM and see if that fixes it? Im gonna just replace that whole wire newayz and probably the pink wire. Other than that I can check the ground but im sure its not the problem. Ordered new Opit and CKP harnesses.

 

Redid all the wiring and i mean all of it. Put it together, started up and is running great, but trying to see if light goes off and ill keep you updated.

 

Nvm, forget what I said, car still runs like major ****. So have I basically narrowed it down to one of my new components? For instance maybe a bad ICM, optispark? I know the coil is fine, and would wires do it? I mean its at every cylinder so I dont think so, I have to say its the opti but will replace both the opti and the ICM. If that doesnt work im gonna kill myself lol.