Hi,

I read the sequence carefully and you are doing and thinking along the right lines to diagnose the systems.
Remember to have the spark distribution system is in good condition first!
I always rule that system into having a priority!

The ECU by itself primes the fuel rail through the system relay of which has two parts.
One half controls the fuel injectors and it may not be making up to ground to power up the injector/AMM circuit so readily.
I would be suspicious of this possibly happening and throwing you off track that the relay is good!

You might try testing for power on the AMM's power wire. On the 240's it has an orange wire.
Art Benstein's method, on Cleanflametrap.com, of putting a small light bulb into the AMM's connector. It helps to observe it's action and give you a peek place inside a central point.


Now the same thing happens, after the CPS sends its signal to the ICU and the ECU and after the engine starts to turn.
Be suspicious of a lazy CPS or its wiring that might be leaking it's output signal to the above components.
Inspect the connector and the sheathing carefully all the way over to the sensors top.
If it is an aging sensor change it or if you think it's an original, put in another one for sure!

Since I'm only a 240 man, I cannot help you with a Regina systems.
I have read that there is little box that can develop internal connection issues!
I think Blindboy has experience it hunting in that area of the electronic ignition world.

This puts me back to the beginning.
On the 240's, I always give up some attention to the power stage relay, about ever ten years or so!
It's a middleman, that fires our ignition coil, by opening and closing the primary side circuit.

This is, Only, because of my nicer west coast environments and my cars are kept indoors as much as possible. (:-)
I don't know how any car survives the North's ice and salts! I'm not sure I would own a car there let alone my many vehicles! I would have a different hobby, like, watching snow fall!


Poke around on the 700 FAQs and other similar postings and you will see issues that point to all of the things I have mentioned.

Good luck fuzzing with that intermittent gremlin, as it's just starting to grin at you!
(:-)

Phil