I ran the Code 54 file you sent me and cavity 1 had a reading of 9.27
And cavity 2 had a reading of 8.74
I went to do the test to the Lm but the terminal cavity for #17 did not have anything in it,it was empty no wire ran into it.I checked a couple
times to make sure i was looking at it correctly.
At this point I would have to say that either the TN/YL wire is broken off in the harness or somebody changed the harness at one point.
ALL 85-87 Turbo LM's have the TN/YL wire in cavity #17 of the Blue Connector.
Only the TBI cars did not use that terminal.
1)Is there actually a pin in the LM for Cavity #17?
2)Is there a Terminal in the Blue Connector Cavity #17 with the wire broken off?
Without the sync signal wire to LM Blue Connector Cavity #17 the car will never run.
Also, it is actually the LM that pulses the injectors, not the PM.
The runs from the LM to the PM 12 Pin Connector through PM Internal Circuitry and out of the PM 10 Pin Connector to the Injectors.
Injector control for injectors 1/2 are on the VT/YL wire in Cavity #2 of the Red Connector.
Injector control for injectors 3/4 are on the GY/WT wire in Cavity #3 of the Red Connector.
IMO you need to correct the Code 54 issue before concerning yourself with injector control codes since the engine controller cannot properly pulse the injectors without the sync signal since it has no idea where #1 cylinder is.