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Petris Opti Diagnosis
If you suspect an Optispark failure and do not have SES codes 16 low resolution pulse, 36 high-resolution pulse, PO1371 low-resolution pulse or 1372 high-resolution pulse, check for spark output using a spark tester and fuel injector pulse with a fuel injector noid light.
The ECM/PCM requires a pulse from the Optispark whether it be on the low or high-resolution circuit to set a code. Meaning that the ECM/PCM has to see one of the two pulses to set a code for the missing pulse. The exception would be 1996-1997 LT1-LT4 with a crankshaft position sensor, they would see crankshaft rotation with no Optispark output
If the Optispark has no output whatsoever the ECM/PCM does not know that the engine is in crank mode.
If you have one of the two, spark, no fuel injector pulse or fuel injector pulse, no spark the Optispark distributor is doing its job providing a low-resolution pulse. The next troubleshooting steps would be from the PCM to the ICM and/or ignition coil.
If you have neither spark or fuel injector pulse, the wiring from the Optispark to the ECM/PCM should be tested. A multi-meter should be used to check for Optispark input voltage, ground, low and high-resolution pulses in the .24 – 4.0 volt range at the ignition system test connector located at the middle of the intake manifold on the passenger side. If you find no output or one output the Optispark has failed.