Chevrolet Camaro Code P1351- Ignition High

Question:
I just replaced the head gasket on my car. When I was finished the car would not start. After playing with it for a bit I figured out it had no spark. So I replaced the little box the coils sit on (it was expensive so I took it off a 98 Pontiac Grand prix gt 3.8) and it started but the check engine light keeps coming on with a code P1351 saying ignition voltage high and open current. So I got another electrical box and coils off a 97 Camaro 3.8 with the same part#.

The pontiac was a different part number box. It runs a lot better with no misses but the same code keeps coming up. I have replaced the plugs and wires when I did the head gasket. Now there are 2 things I have noticed 1. The converter is bad in it and will be replaced in the morning. 2. I found a ground wire to the electrical box broke so I soldered it back together. Well hope you can help.

1998 Chevy Camaro. 3.8 dash lights = check engine codes P1351. Repairs done prior = head gasket replacement replaced the coils and the electrical box they sit on plus plugs and wires.

Answer:
Hello and welcome. Thanks you very much for the tip/donation. The Ignition Control Module (ICM) sends signals that the PCM requires for fuel control and spark advance calculations. At the start of engine crank, the ICM controls spark advance (Bypass mode.) When the second 3X reference pulse is recognized by the PCM, the PCM applies 5 volts to the Bypass circuit, commanding the ICM to switch spark advance to PCM control (IC mode). If the PCM detects an open in the IC circuit, DTC P1351 will set.

The engine will start and may run in Bypass mode timing. It is possible that damage has cured to the IC control circuit wire, or the low reference circuit wire between the PCM and the ignition control module. Just be sure the ignition modules are the same part # You are going to need a digital multimeter to do some tests.

First disconnect the pcm (connector C1-blue) and ignition control module. Check for continuity of circuit 423 (white) between pcm and ignition control module with key off. Then do the same for circuit 453(red/blk). Less than .5 ohms is ok. If high resistance, or open circuit on either, you will need to trace the wire from pcm to module very carefully. Also look very carefully at terminals inside ignition module connector for damage.

Damage may occurred during the several times the connector has been on and off. Also pull lightly on each individual wire at ignition module connector to make sure the wires do not stretch. Once again, thank you for the tip/donation. See schematics i will send in a few moments...