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Old 06-17-2014, 07:12 AM   #21
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if the lt green wire was shorted to ground it would keep the solinoid on. pull the plug and the pcm plug and use a meter set on ohms check the wire to battery neg. should be infinite. if 0 you have to find where the wire is touching
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Old 06-17-2014, 08:38 PM   #22
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So much for that idea, the only thing to ground in the transmission 19 way conductor is the ground wire (black/white) as it should.

I can wiggle the green wire some in the socket and see the contact in the connector move, could not having contact at this location cause the problem?
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Old 06-18-2014, 11:59 AM   #23
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OK I ordered a 20 pin universal GM transmission connector / pigtail assembly so that I can properly read the resistance values on the transmission solenoids, to rule out internal issues.

I will also check the transmission I removed to confirm if any issues were there as well....I suspect the issue I am having is not internal to the transmissions.....but this will confirm it for certain.
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Old 06-18-2014, 12:43 PM   #24
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if you have a open(spot not touching) somewhere that would cause the 1-2 solenoid to be off all the time.
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Old 06-18-2014, 12:45 PM   #25
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that makes sense with your chart, 2 and 3 are the only things working
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Old 06-18-2014, 05:40 PM   #26
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Getting closer to the answers i hope, away on business for a couple days, hope to get connector and do some more diagnostic checks on Friday.
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Old 06-18-2014, 06:03 PM   #27
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I wanted to confirm the PCM location.

Is it on the firewall just inside the drivers side strut tower?

If that is it how do you unlock the large connector that goes into it? Does the metal band/lock just rotate up?

Trying to look at the schematics on gmpartsdirect to get an idea and its a little confusing, makes it look like its next to the ignition module on the front passenger side of the engine. But it may just be how they have the exploded views done.
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Old 06-19-2014, 07:24 AM   #28
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from the gm service manual

"Powertrain Control Module (PCM)
Behind lower RH of I/P, above kick panel"
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Old 06-19-2014, 11:18 AM   #29
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Talked to a transmission guy this morning. The PCM turns on the shift silinoids in these transmissions by closing the ground on them. So an open / broken wire would do what I'm seeing for sure.

I will be tracing and checking the wire for the 1-2 silinoid tomorrow when I get home.
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Old 06-23-2014, 08:23 PM   #30
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OK does anyone have a wiring diagram of the PCM outs?

Pulled the plugs tonight and yes it is behind the glove box, but there are two light green wires landed side by side in the back connector.

Want to ensure I am troubleshooting the right circuit.

And I did receive a "test" plug for the transmission and both shift solenoids test perfectly at 21.5 ohms

Thanks in advance

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