[Macroblock]

I turned my attention to the Ignition Diagnostic Connector. I identified "Terminal A", which is Circuit 430/Crank Reference High.

Using a signal generator, I inserted a spoof signal at Terminal A. This spoof was a square wave with a 0-5 VDC range and a 50-50 Duty Cycle.

The objective of the spoof is to simulate a refined Crank Reference signal that would normally come from the Ignition Module after odd-pulse-synchronization of the raw signal provided by the Crank Shaft Sensor.

Starting at .4 Hz, I observed the fuel pumps started to operate. For simplicity, I set the output to 1 Hz. I heard a click, resembling an injector becoming activated. At 10 Hz, the same injector was activating with a consistent on-off pattern.

After a number of subsequent tests, I discovered that only Injector 6 was operating. This remained true when I conducted the same tests with or without the DIS Ignition Module installed. None of the other injectors were activated by the ECM during testing.

Page 6E3-C2-2 of the Factory Service Manual indicates that all 8 primary injectors should be pulsed during start up (not just number 6).

It could be that this is a tell-tale sign that something is 'incorrect' inside the ECM and this is possibly the reason the car will not start.

More testing to follow...