How to Test Your LT1 PCM 1Turn off the ignition and location the vehicle's transmission into park -- or first gear, if it really is manual ">Auto diagnostic tools. Engage the parking brake and turn the ignition back to the "On" or forward position.
Do not re-start the engine.2Plug an automotive scan tool's data cable in to the vehicle's diagnostic information port. This port ought to be located beneath the steering wheel, underneath the dashboard.3Turn on the scan tool and select "PCM" ">auto diagnostic software; from its main menu.
Pick "PCM Test" from the PCM menu.4Wait when the scan tool performs the PCM self test. Appear at the screen on the scan tool and read the test final results. When the scan tool shows that the PCM has failed, one or a lot more from the self tests, then it really is faulty and have to be replaced.
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