The test bench keeps getting more involved. Seems like the CCM is spamming the aldl in a loop trying to query the ECM / PCM for configuration info at startup. As such it won't respond to the hush command so eehack / flashhack can talk to it. According to the FSM it does this until DTC 41 - loss of aldl comms is set. I tested in-car by pulling both PCM fuses and get the same thing as on the bench. This is what eehack sees when I run an idle scan and wake the module by giving it 12 volts on E4.

Code:
START IDLE SCAN LOG
::: GAP4796ms
4796ms to 4806ms (10ms) :: 10590000
::: GAP9ms
4815ms to 4823ms (8ms) :: 00009797
::: GAP4ms
4827ms to 4838ms (11ms) :: 4057000069
::: GAP168ms
5006ms to 5014ms (8ms) :: 10590000000097
::: GAP21ms
5035ms to 5046ms (11ms) :: 4057000069
::: GAP151ms
5197ms to 5208ms (11ms) :: 10590000
::: GAP4ms
5212ms to 5222ms (10ms) :: 00009797
::: GAP4ms
5226ms to 5238ms (12ms) :: 4057000069
::: GAP164ms
5402ms to 5414ms (12ms) :: 10590000000097
::: GAP21ms
5435ms to 5446ms (11ms) :: 4057000069
::: GAP150ms
5596ms to 5607ms (11ms) :: 10590000
::: GAP5ms
5612ms to 5622ms (10ms) :: 00009797
::: GAP4ms
5626ms to 5638ms (12ms) :: 4057000069
::: GAP167ms
5805ms to 5814ms (9ms) :: 10590000000097
::: GAP21ms
5835ms to 5846ms (11ms) :: 4057000069
::: GAP150ms
5996ms to 6007ms (11ms) :: 10590000
::: GAP5ms
6012ms to 6022ms (10ms) :: 00009797
::: GAP4ms
6026ms to 6038ms (12ms) :: 4057000069
::: GAP164ms
6202ms to 6214ms (12ms) :: 10590000000097
::: GAP21ms
6235ms to 6246ms (11ms) :: 4057000069
::: GAP149ms
6395ms to 6406ms (11ms) :: 10590000
::: GAP4ms
6410ms to 6422ms (12ms) :: 00009797
::: GAP4ms
6426ms to 6437ms (11ms) :: 4057000069
::: GAP166ms
6603ms to 6614ms (11ms) :: 10590000000097
::: GAP21ms
6635ms to 6646ms (11ms) :: 4057000069
::: GAP150ms
6796ms to 6806ms (10ms) :: 10590000
::: GAP4ms
6810ms to 6822ms (12ms) :: 00009797
::: GAP4ms
6826ms to 6837ms (11ms) :: 4057000069
::: GAP167ms
7004ms to 7014ms (10ms) :: 10590000000097
::: GAP20ms
7034ms to 7046ms (12ms) :: 4057000069
::: GAP149ms
7195ms to 7205ms (10ms) :: 10590000
::: GAP5ms
7210ms to 7221ms (11ms) :: 00009797
::: GAP4ms
7225ms to 7237ms (12ms) :: 4057000069
::: GAP167ms
7404ms to 7414ms (10ms) :: 10590000000097
::: GAP20ms
7434ms to 7446ms (12ms) :: 4057000069
::: GAP148ms
7594ms to 7605ms (11ms) :: 10590000
::: GAP5ms
7610ms to 7621ms (11ms) :: 00009797
::: GAP4ms
7625ms to 7637ms (12ms) :: 4057000069
::: GAP167ms
7804ms to 7813ms (9ms) :: 10590000000097
::: GAP21ms
7834ms to 7845ms (11ms) :: 4057000069
::: GAP151ms
7996ms to 8006ms (10ms) :: 10590000
::: GAP4ms
8010ms to 8021ms (11ms) :: 00009797
::: GAP4ms
8025ms to 8037ms (12ms) :: 4057000069
::: GAP168ms
8205ms to 8213ms (8ms) :: 10590000000097
::: GAP21ms
8234ms to 8246ms (12ms) :: 4057000069
::: GAP151ms
8397ms to 8405ms (8ms) :: 10590000
::: GAP4ms
8409ms to 8421ms (12ms) :: 00009797
::: GAP5ms
8426ms to 8437ms (11ms) :: 4057000069
::: GAP168ms
8605ms to 8613ms (8ms) :: 10590000000097
::: GAP21ms
8634ms to 8646ms (12ms) :: 4057000069
::: GAP150ms
8796ms to 8805ms (9ms) :: 10590000
::: GAP4ms
8809ms to 8821ms (12ms) :: 00009797
::: GAP4ms
8825ms to 8837ms (12ms) :: 4057000069
::: GAP168ms
9005ms to 9013ms (8ms) :: 10590000000097
::: GAP21ms
9034ms to 9046ms (12ms) :: 4057000069
::: GAP150ms
9196ms to 9205ms (9ms) :: 10590000
::: GAP4ms
9209ms to 9221ms (12ms) :: 00009797
::: GAP4ms
9225ms to 9237ms (12ms) :: 4057000069
::: GAP164ms
9401ms to 9413ms (12ms) :: 10590000000097
::: GAP21ms
9434ms to 9446ms (12ms) :: 4057000069
::: GAP150ms
9596ms to 9605ms (9ms) :: 10590000
::: GAP4ms
9609ms to 9621ms (12ms) :: 00009797
FINISH IDLE SCAN LOG
Can't seem to get it to set DTC 41 on the test bench so I'm going to try to rig up a couple additional connectors so I can get my spare PCM in the loop and hopefully shut it up.

Apparently there are two separate voltage sensing circuits. From the FSM book 1 part 2, section 8D page 7:

01 - fuel level (gallons)
02 - IP dimmer value (adc counts)
03 - ambient light sensor (adc counts)
04 - rear defogger timer (seconds)
05 - vehicle speed (mph)
06 - PASS key (adc counts)
07 - ignition voltage (volts, tenths)
08 - switched battery voltage (volts, tenths)
09 - cluster lamp dimming (pwm)
10 - cluster lcd backlight dimming (pwm)
11 - radio & climate control backlight dimming (pwm)
12 - led dimming (pwm)
13 - vehicle configuration
14 - vehicle configuration
15 - oil monitor effective revolutions
16 - ccm software version