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I've seen that ... connects to the unobtainium thing.
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I've seen that ... connects to the unobtainium thing.
You must be registered for see images attachForgot to laugh
The wires are pink/ black stripe and brown , pretty sure it’s just provisional within the harness but not needed .. correct me if I’m wrong
KYour way moreThis connector was more of a challenge. I first scoured the '93 Electrical Wiring FSM, and couldn't find what I was looking for.
On a hunch, I switched over to the '94 Electrical Wiring FSM, and discovered the following. The connector *is*
emissions related, but nothing having to do with the fuel vapor canister:
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So this makes sense. With Federal emissions this connector would remain unused, but if this
vehicle was built with CA emissions this would have been connected to the AIR pump bypass
valve.
Since this diagram tells me that the brown wire is circuit #436, I decided to go back to the '93
FSM and use this unique number to see if I somehow missed this in my first attempt. Circuit
436 didn't get me to the exact spot in the diagrams, but in a table it did associate this number
with the Secondary AIR Injection Solenoid Valve. Searching with part of that phrase did the trick:
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Note the differences in the way the '93 & '94 wiring diagrams are drawn. For me, the newer style is much
more intuitive than the older style. And again, once I locate a unique circuit #, or connector number, (C118)
or even a less unique hint like the pnk/blk and brn color codes, I can find obscure details like this in a
minute or two on the laptop, instead of an hour or two manually paging through the printed books.
No doubt that the OCR program used to scan in the '94 FSM was configured a little differently than when
the '93 FSM was scanned. I have found that different year .pdf files vary in how well they can be
searched, so sometimes picking a slightly different year FSM to research your GMT400 may improve
your results as long as you stay in your general design era. (TBI '88-'94, {'95 unique}, Vortec '96+)
Don't get me wrong, the paper books are superior if I'm trying to do project research, so each tool has their
place. (Insert a tip of the hat here to the forum members who set us up for success with the FSM cache.)
Another wiring harness mystery solved. More good practice in the diagrams. Life is muy bueno. :0)
kudos to your ability and efforts to be able to navigate and understand systems like these that I can’t even wrap my brain around hardly . I guess some emissions and some electrical I get but mostly that’s where it stops for me .This connector was more of a challenge. I first scoured the '93 Electrical Wiring FSM, and couldn't find what I was looking for.
On a hunch, I switched over to the '94 Electrical Wiring FSM, and discovered the following. The connector *is*
emissions related, but nothing having to do with the fuel vapor canister:
You must be registered for see images attach
So this makes sense. With Federal emissions this connector would remain unused, but if this
vehicle was built with CA emissions this would have been connected to the AIR pump bypass
valve.
Since this diagram tells me that the brown wire is circuit #436, I decided to go back to the '93
FSM and use this unique number to see if I somehow missed this in my first attempt. Circuit
436 didn't get me to the exact spot in the diagrams, but in a table it did associate this number
with the Secondary AIR Injection Solenoid Valve. Searching with part of that phrase did the trick:
You must be registered for see images attach
Note the differences in the way the '93 & '94 wiring diagrams are drawn. For me, the newer style is much
more intuitive than the older style. And again, once I locate a unique circuit #, or connector number, (C118)
or even a less unique hint like the pnk/blk and brn color codes, I can find obscure details like this in a
minute or two on the laptop, instead of an hour or two manually paging through the printed books.
No doubt that the OCR program used to scan in the '94 FSM was configured a little differently than when
the '93 FSM was scanned. I have found that different year .pdf files vary in how well they can be
searched, so sometimes picking a slightly different year FSM to research your GMT400 may improve
your results as long as you stay in your general design era. (TBI '88-'94, {'95 unique}, Vortec '96+)
Don't get me wrong, the paper books are superior if I'm trying to do project research, so each tool has their
place. (Insert a tip of the hat here to the forum members who set us up for success with the FSM cache.)
Another wiring harness mystery solved. More good practice in the diagrams. Life is muy bueno. :0)
KYour way more
kudos to your ability and efforts to be able to navigate and understand systems like these that I can’t even wrap my brain around hardly . I guess some emissions and some electrical I get but mostly that’s where it stops for me .
I know basics I’m more on the mechanical and definitely suspension side of these trucks .
Normally you don’t have to scavenge a wiring issue or dilemma on these older trucks, they are rather plain Jane , but it pays off to know How to read a schematic .
My 99 suburban is CA Emissions and has the electrical sai pump ! Although it’s a vortec and the pump is placed differently along the driver side on fender and looks different than a 88-94 tbi sai pump I assume.
That would have eliminated me from even knowing that plug was routed in place for that particular pump .
At least I was in the general vicinity of knowing it was something provisioned .
Appreciate the help