I'm not sure what you mean by fail mode? With diagnostics, I hook-up a scanner that shows live engine data. I can look at data, key on engine off, and cranking. I also check codes, just out of habit. It is possible there are some old codes.
With the injectors, you can unplug an injector, use a noid lite on the connector, crank the engine, see if the lite pulses, if it does, there is voltage and ground. It is possible to use an led testlite on the injector plug terminals.
If there is spark at the plugs, there is an rpm signal, but, if the computer doesn't see it, no injector pulse. There is probably a purple wire with white tracer, going from the ignition module to the computer, carries the rpm signal, no signal, no injector pulse. I have heard of faulty ignition modules causing this problem. I can't be positive from here.
You can ask as many questions as you want, there is no limit. You may reach the limit of my capabilities?
Thursday, July 23rd, 2009 AT 12:31 PM