[cjperformance]

I dont know details on how inj signal works, but for basic troubleshooting...Can you backpin the harness at the ECU and check the signal right out of the source (ECU)? I was taught to take a straight pin and slide it in from the back of the connector so i could get an oscilloscope lead or other meter on signal wires. Not sure if the ecu harness is backpinnable. Only had it off one time to install my flex fuel kit and i dont recall the construction other than some levers to release. You dont want to pierce wires or damage waterproofing though....but if all else fails... probably more desirable than getting a new ecu and find out you didnt need it.

That would validate or invalidate the wiring harness.