Ωhm

Disconnect C213. Check for Battery Voltage (B+) on C213_A with KEY ON and during ENGINE CRANK. C213_B is the GROUND leg for the Ignition Control Module (ICM).

Look at the vacuum hose between the Fuel Pressure Regulator (FPR) and intake manifold for fuel. Leaky FPR.

One more quick check. Look at the vacuum hose for fuel between the Fuel Pressure Regulator (FPR) and intake manifold. Another chance for a slow fuel leak.

Try holding throttle plate at the WOT position. During CRANK this will shut-off the fuel injectors (clear flood) until engine speed reaches 400rpms. Looking for slow leaky injector(s). Does this cut down on CRANK time when engine is HOT SOAKED?

Using my desktop computer. DELL

Just a thought here, make sure that distributor isn't locked up on the cam gear.

C104_G Starter Relay (coil) GND

That seems to sum it up. Let me add the canister vents the fuel tank vapors and pressure to the atmosphere through the charcoal, through the filter (if good) and out the bottom. Under this condition the bottom is an outlet.

Maybe this thread can help. Check out the utube video. @MississippiComanche

'AI' is young and still learning. Just ask John Connor.

One more fuse to check. TRANS (7.5A).

Wire (GRN) between Starter Relay and IGN SW is shown as going to the RUN dot, should connect at the START dot.

If both continuity checks between (C267_5 - SR "I" wire) and (SR GND wire - battery negative) are 0Ωs, then I'd disconnect all wiring at the SR and look for continuity between each terminal and SR metal case. Still a problem here.

@NickInTimeFilms is a big time JEEP RENIX guy. His vehicle was an AUTO trans. With trans selector NOT in P or N, 5vdc from the ECU could appear on the SR GND wire. Only a continuity test between the IGN SW (C267_5) and the "I" wire at the SR will prove out the wiring. NOTE: C267 can be labled pin5 or pinS, depending on where you look.

Don't understand that one, unless SR case is shorted to GND internally. Still doesn't answer why you needed to connect GND terminal to ground or why you have no + on the IGN wire during engine CRANK.

Okay. KEY OFF. Remove the GND wire on the SR and connect the GND terminal on the SR to a good ground. Try jumping battery voltage on the "I" terminal again. Does Starter Motor engage?

With the wire off, connect battery voltage straight to the SR terminal, on the SR. Not sure here if that's what you did. Use CAUTION.

Good sign. KEY OFF. Remove the wire from the IGN relay terminal at the Starter Relay (SR). Jump battery voltage to the open terminal on the SR. CAUTION: VEHICLE COULD LUNGE IF IN GEAR. Does Starter Motor engage?

With KEY ON/START does D2_4 show voltage?

Check your wiring against this. Looks like GRN (IGN) and BLK w/tr are swapped.