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Print in friendly format Send this term to a friend  4L80E
Automatic Transmission - 4 Speed

1st Gear: 2.43
2nd Gear: 1.49
3rd Gear: 1.00
4th Gear: 0.75

Reverse: 2.07

- Used in production GM models...
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Re: Help on CCM pull...

Subject: Re: Help on CCM pull...
by Schrade on 2015/12/31 14:04:13

I understand what you're sayin' here Matt, but I don't 'see' it, for step 1.

What is the 'ground of connector'?

You asked before if there's a Black wire, and there's 2 of them in the connector - both on the lower left of the HU diagram. Those 2 are tested in steps 2, and 3, respectively.

Circuit 50 is #1, top left of head unit. It's 12V from Ignition ON.

It seems to me that you could ground your light (or multimeter) on ANY ground, to see that either there IS 12V, ...

OR, that there's NOT 12V, because of a blown fuse, or an open on #50.

I know that you can't skip steps - NORMALLY. But if there's REDUNDANCY, as there SEEMS to be, then ....... ?

-------------
Can't anyone else ring in here, and say what they're seein' in step one? I need all the help I can get on this.
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