Jaguar Repair: 1985 jaguar xj6 no fuel from injectors, 1985 jaguar xj6, starter solenoid

Question
Howard, before we start I wanted to say thanks for taking
the time lend your advise and expertise. I have a 1985
jaguar xj6
as I've noticed this seems to be a common problem for this
car I've been unable to locate a common fix via internet.
I'm getting 12 volts at the injectors, and no pulse or fuel
on the start up. I've confirmed alot,and have come to a
standstill as to what to check next.
1. I've confirmed that there is fuel at each injector from
te hose. Yes it starts on carb sray and won't run
2.I've confirmed several different voltage values at the ecu
plug, which are needed for injectors to fire correctly.
 A. trigger from the coil 12 volts (pin #1)
 B. starter solenoid input 12 volts (pin #4)
 C. Main power relay 12 volts (pin #10)
 D. ECU ground is good (pin #5 chassis ground)
I'll be honest that's all I've check at the ecu plug.
I have also swithced the ecu out with a known good unit
and still had no success. I read on here that the coolent
temp sensor when bad creates a "open circuit" which will
prevent the car from a start, so I check the sensor for
continuiety, and it failed. I then bypassed it, by inserting
a jumper to the plug in, and still got not start.
I'm not for sure if this could be relative or not. I do know
of a technician who is good on these cars, but he is a
distance, aswell I'm no machanic but usually have success on
most of my cars. If I have someone do the job it's because I
just don't have the tools or logistics to do the job. I've
got alot of info on the wiring system as well the specs. I
almost feel it could be something simple that I've missed.
Look foward to hearing back. Thanks Mario Cheek Sr.  

Answer
The only things I see is that the #1 pin should be tested with the engine spinning to see that it is a pulsing signal not 12v and the ECU ground is not just pin 5, there are several others. Also you should test the injector grounds to see if they pulse to ground at the ECU plug. I found that a "Logic Probe" is the best tool to use as it does not interrupt the signals. A test light can ground a signal as does a analog volt meter in some cases.

Also confirm that the battery is a "Deep Charge" battery as a conventional battery can spin the engine fast but fail to fire an injector.

Howard