I need to better understand exactly how the EFI Main Relay operates in
conjunction with its surrounding components. I've just spent some time
carefully studying the diagrams in my factory manual, and I'm asking for
somebody to check the description below for correctness.

Below is what I gather actually happens when you turn the key in a properly
operating vehicle (wire colors given are those of the 2nd gen Integra, so
they may not be correct for whatever car you're used to looking at).

Thanks for any help.

And heeeere we go (it's long!)...

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Driver turns key to ON (but not to START):
------------
1) Ignition switch terminal IG1 sees power
2) Power sent thru Main Relay (MR) terminal 5 (blk/yel wire) to a permanent
ground at MR terminal 2 (blk wire)
3) First relay is energized as current flows from 5 to 2. ECU monitors this
flow at its terminals A2 & A4 (blk).
4) Closure of first relay allows connection from MR terminals 1 (yel/wht)
to second relay (fuel pump relay) at MR terminal 8 (grn/blk), which
connects to ECU terminals A12 and A14.
5) Before current can actually flow, ECU must supply ground to its
terminals A12 & A14 (grn/blk).
6) Grounding A12 & A14 will cause second relay to close.
***BOTH RELAYS CLOSE AT SAME TIME (FIRST CLICK)***
7) Current from MR terminal 5 is tapped from inside relay to flow to the
second relay to the fuel pump at MR terminal 7 (yel/blk).
8) Since engine is not running and ignition has just been turned on, ECU
cuts ground to A12 & A14 after two seconds allowing just enough time to
pressurize the injectors.
9) ECU knows the engine is not running because of the Crank Angle Sensor in
the distributor, which it uses to see engine RPM.

Driver turns the key to START
-----------------------------
10) IG1 terminal at the ignition switch loses its power as ignition switch
is rotated.
11) ST terminal at ignition switch is now powered, and is allowed to
energize second relay all by itself, subject to ECU's grounding at A12 &
A14.
***(SECOND CLICK)***
12) Battery current flows from the ignition switch's ST terminal to MR
terminal 4 (blu/wht), then to MR terminal 8, just like it did in Step 4.
13) As long as starter is operating and the Crank Angle Sensor indicates
the engine is NOT running,the ECU will hold ground at A12 & A14, keeping
second relay closed and fuel pump operating.

Engine fires, driver releases key
---------------------------------
14) Crank Angle Sensor indicates engine RPM is high enough to mean the
engine is running.
15) Second relay momentarily loses power and opens as the key springs back
to the ON position.
16) Second relay recloses as power is restored through the ignition switch
IG1 terminal.
***(THIRD CLICK)***
17) First relay now closed through IG1, allowing normal battery voltage to
close second relay and for IG1 voltage to operate fuel pump,