Engine not turning over means that the starter is not turning the engine. If it turns over but doesn't run, then it's not firing.
Your ecu will not affect the engine from turning over.
If it's not turning over, check your connections on the battery. Make sure they're tight. Make sure there is no corrosion present. Make sure the connections at your starter are tight.
If the above checks out, do this:
Quote:
Originally Posted by Travis89Turbo
Pull the little wire from your starter and have someone turn the key and check for voltage.
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Also check that you have 12 volts DC at the large starter lug (where the big wire connects) at all times, regardless of key position.
If the switch leg (little wire) has no voltage with the key in the "Start" position, then double check the neutral safety switch bypass you did. I can't remember if these cars have a starter relay, if they do check that. Also may want to make sure your ignition switch is working, as well as the ignition fuse (once again, don't remember if these have that).
If there is no 12V DC at the main lug, you have a break in the wire or a bad connection. Check the entire wire for soft or hard spots.