LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Car threw a code help

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Old Aug 12, 2010 | 10:34 AM
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Car threw a code help

P1361 ic circuit low voltage. I took the ignition coil module up to the auto parts store test good. Have check voltage on terminal b to ground I'm right in between 1.0-4 volts and I have ground on terminal c. Any ideas? It's a 97 Lt1 camaro m6
Old Aug 12, 2010 | 09:57 PM
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P1361 indicates at some point the PCM detected a short to ground on the white wire to the IC Module. Could be intermittent, could be caused by excessive heat soak of the ICM. Was the IC module hot when it was tested?
Old Aug 13, 2010 | 09:02 AM
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I don't recall it being hot. I think it's the icm cause I have put jumpers to the icm from the pcm to the fusible link and it still throws the same code
Old Aug 15, 2010 | 07:20 PM
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Ok so I have gone over everything still having the problem. If I take power off the ECM then put power back to it the code goes way for a min then the code comes back. I'm thinking I have a short in the ECM could this happen? I do have a ECM out of a 95 witch is obd1 the car runs and doesn't have the missing sound like with the obd2 ECM.
Anyone have a ECM out of a 1997 lt1 camaro? I did replace the icm problem still happening
Old Aug 16, 2010 | 05:20 AM
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I doubt its a problem with the PCM. Try a known good ICM, or space the ICM off the head to reduce the heat soak.
Old Aug 21, 2010 | 08:54 PM
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ok so i have tryed 2 icm and a new pcm wtf is the problem i get power to all places i should be, ran new wire from the pcm to the icm and new ground too. the only thing the pink wire that comes from the crank shaft sensor has ground on it is that ok? could it be the opti spark? its not even a year old? that would throw different codes right?

Last edited by madmatt97; Aug 21, 2010 at 08:57 PM.
Old Aug 22, 2010 | 06:28 PM
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Originally Posted by madmatt97
ok so i have tryed 2 icm and a new pcm wtf is the problem i get power to all places i should be, ran new wire from the pcm to the icm and new ground too. the only thing the pink wire that comes from the crank shaft sensor has ground on it is that ok? could it be the opti spark? its not even a year old? that would throw different codes right?
The coil/ICM and the crank sensor both receive power from the same fuse. If you had a short on the pink wire to the crank sensor, the fuse would blow and nothing would work. If the crank sensor failed, you would have P0335. Have you ever had that code show up?

Some of what you are posting is very difficult to interpret. What does this mean?

"I have put jumpers to the icm from the pcm to the fusible link "

What exactly did you do?
Old Aug 23, 2010 | 09:48 AM
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sorry the white wire from the pcm to the icm isnt a fusible link i didnt see i put that in there. i have never had P0335 show up the only code i get is p1361.
Old Aug 29, 2010 | 07:02 PM
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Originally Posted by Injuneer
The coil/ICM and the crank sensor both receive power from the same fuse. If you had a short on the pink wire to the crank sensor, the fuse would blow and nothing would work. If the crank sensor failed, you would have P0335. Have you ever had that code show up?

Some of what you are posting is very difficult to interpret. What does this mean?

"I have put jumpers to the icm from the pcm to the fusible link "

What exactly did you do?
So I took a jumper wire from the ECM to the icm in place of the white wire, code P1361 still throws. on the pink wire to ground I get 12 volts and same with the green wire to ground I get 12volts. The white wire has 1-4 volts on it when cranking. The black wire goes to ground and when put to bat the test light lights.



SHBOX help please could this be a opti problem or another bad icm? I replaced the icm, coil and ECM
Old Aug 29, 2010 | 09:09 PM
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Ok one thing I have a question about is the white wire (terminal B) in the gm service manual step 3 says
Measure voltage between the ignition coil module harness connector terminal b and ground during cranking. Is the voltage within the range shown 1.0-4.0v? When I test here the voltage bounces from like 1.4-3.8v is it suppose to bounce around or be a constant? I know it's the trigger wire and it carries the pulses from the ecm so maybe it is?

Last edited by madmatt97; Aug 30, 2010 at 08:42 AM.
Old Sep 6, 2010 | 08:09 PM
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pulled the opti spark off today it has to be the problem one of the screws on the rotor cam off and the rotor was off set to one side it was also filled with rust dust. ordering a new opti in the morning. I hope that was causing my trouble. Im buying a new gm one does anyone think i should open it up and loctite the screws on the rotor? I had a msd opti when they first came out and the rotor came off that one to.
Old Sep 6, 2010 | 09:15 PM
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I'd use thread locker on the new rotor.
Old Sep 7, 2010 | 10:52 AM
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Thumbs up

Originally Posted by madmatt97
So I took a jumper wire from the ECM to the icm in place of the white wire, code P1361 still throws. on the pink wire to ground I get 12 volts and same with the green wire to ground I get 12volts. The white wire has 1-4 volts on it when cranking. The black wire goes to ground and when put to bat the test light lights.



SHBOX help please could this be a opti problem or another bad icm? I replaced the icm, coil and ECM
Thought this was rude as Injuneer was clearly trying to help you and he is also VERY educated with these engines.
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