Alright I know this is the code:

Alright, I checked the White wire, and it was giving me 0.600 - 1.500 volts during idle/running. From the quote its suppose to be 0. I unhooked that wire and the car wouldnt start with it unhooked. Duh. But either way Im still having problems out of this. Note: All ignition parts are brand new! So you can take those out of the problem. I just need to know where to go from here?

I was having a problem out of my headlight switch and there were like 4 wires that melted each other, well got that fixed and its working fine, I believe the same thing is wrong with my ICM. Thanks for any input, really wanna get rid of this major misfire.

Other problems I had were:

1441 (fixed, wire was broken on pigtail)
1641 (fans being on switch set it off)

 

Anyone? 96 Lt1 car

 

ok first on shoebox's site the code explination is
""Ignition Control (IC) circuit high voltage (open circuit)""
so why dont you check both ends and make sure the circuit isnt open or touching ground

 

That's my quote and it wasn't quite right. It should not be 0 but it must be less than 4.6 volts. The 1351 will only be set during cranking. This voltage should be between 1 and 4 volts. The only way that line could be higher than that is either the ICM has an internal short, the ground was lost to the ICM, the (IC) wire is shorted to another wire that is carrying a higher voltage (like battery voltage) or the PCM has an internal problem.

That's it.

Start by checking the ground to the ICM

 

Alright I will do that, and Daniel I know its a high voltage code. I am going to run through the wires in the harness today. Someone told me to check the wires on the pass side that get burnt by the header, but the ICM wires go over the top so dont think that was a problem.

 

Well tested all the wires on the connector, during startup the white wire only gave out 1.8 and no ore than that, its not over 4.6 volts unless its too low. Dont know what to do.

And ground is good, should be the same ground to the side of the coil bracket right.

 

The problem with posting the same question on multiple forums, and one of several reasons it is discouraged, is that people way be wasting their time telling you something you have already been told in the other post, or simply do not get the full background on the problem because your responses are not all visible.

I'll merge the threads on of the forum of your preference, or you can simply delete one of the posts.

 

Ill delete the other one but either way cant figure this **** out. Only posted on both because some tech people dont go into the LT1 section and some LT1 people dont go into the tech section.

 

Was this test done with the ICM connector off or were you just back-probing the white wire? 1v-4v is acceptable with the connector off during cranking (though I really can't figure out why the FSM says to use the DC scale for a 1996, when it says to use the AC scale for a 1995 and earlier)

Is the car actually running bad? I don't see any description of the problem, other than you have the trouble code.

 

Man I cannot figure this out, I would like to have more of your expertise on the subject. I fixed the EVAP code, it was a wire that was broken right at the pigtail of it, fixed! Now for the 1351. I checked the voltage at all the wires, and that white wire only gives out .6-1.5volts and no more, but throwing a high voltage code saying its over 4.6v.

All ignition components are new, connections to the coil and ICM are good. (LT1 car), code popped up about 5 days ago, misfire on just about every cylinder, and I believe its a short, either in the wiring or bad optical sensor in the optispark, not sure.

 

This car is majorly misfiring and worse at high rpms. It stumbles real bad, backfiring and running rich because of it. It was fine until this code popped up. So in other words, hooked up a scanner and the thing said misfires in every cylinder.

All new ignition including optispark/icm/coil/plugs/wires/fuel pressure regulator/fuel pump and I dont know what the prob is, and it has to be this.

Took it to 2 shops today, one said he doesnt want the hassle, the other didnt have time. I am about to pull the whole harness, check every single wire and if thats not it im changing the rear part of the opti because the guy at the 2nd shop said HIGH VOLTAGE measn its coming from the cam sensor or wiring to the cam sensor and the LOW VOLTAGE would be from the crank sensor.

 

Pulled the pigtail connector to the optispark, from its subconnector down to the optispark and the connection to the opti where the wires go into the plastic, some of the wire on 2 of them close to each other was showing copper, so dont know if they were arching off each other and sending bad signal or what but gonna check the rest of the harness now.

 

More information! I pulled the full harness, the crankshaft position sensor wiring is jacked up, just about every line is pinched and the lighter color line (tan) is the worse, about 1/4 inch of copper showing on it and at the plastic connector. Could this be the problem? Maybe its grounding off? But wouldnt that be LOW VOLTAGE readout? But I know from the schematic that the crankshaft position sensor goes straight to the ICM.

 

Though the crank position sensor is only used for misfire detection, faults in the wiring or with the sensor have caused problems for some people, since it is tied into the low resolution signal from the opti. If there are some problems in this area, it could possibly cause your symptoms.

 

So do you think the opti pigtail could do it?