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· Registered
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Discussion Starter · #1 ·
So I bought a broken down 97 firebird 3800, and got it running pretty good. It looked like the connector for the tps had just gotten taken off it, so I bought a new connector but have no idea which wire goes to which pin. The three wires on the car are light green, dark green and black.
Let me know if you guys know anything, thanks.

· Administrator
1,530 Posts
Here's a pile of info from TPS categories in 1997 GM service manuals (97 was a spotty info year, so you may have to do a bit of evaluating). You should be able to identify things from this, or share more details as you dig further, if needed. Your colors may also be faded versions of the ones I mention below, if you peel back loom further, but maybe not.

Schematic for 1997 TPS/PCM wires for some engine items (if necessary, you can use a multimeter on wires with key-on to confirm 5V and ground, or chase continuity back to PCM pins with power disconnected)
Pin A: Black ground (to PCM Blue C1 connector, Pin 56)
Pin B: Dark Blue position signal out (to PCM Clear C2 connector, Pin 53)
Pin C: Grey 5V from PCM (to PCM Blue C1 connector, Pin 16)
Rectangle Slope Font Parallel Pattern

PCM connector face numbering map (same for both)
With battery disconnected, you can use a 7mm (or 9/32") socket to loosen the center bolt to pull straight out from the PCM (there's a rubber weather seal gasket that will be in there). The bolt stays in the connector, similar to the ignition module's 7mm bolt in the center of the flat harness, so just recognize when it gets fully loose, and carefully line up for install to snug down just barely hand-tight.
Rectangle Font Handwriting Parallel Diagram

TPS system description, in case you need notes.

Font Rectangle Parallel Number Slope
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