Bosch TPS wiring

[enginebob]

I have a 76 Cadillac that I am putting a MS 2 on and using the stock efi throttle body. It has a Bosch 5 wire TPS on it. The wire colors are orange, black/white, lt. green, tan and pink. Wondering what wires to use or how to test it to find what to use?

[trakkies]

Just a guess, but could it be a normal pot with an additional switch at idle (or some other position)? Some playing with a DVM set to resistance should prove this. Check for a dead short between two wires when it is at the zero position which goes to open circuit when the pot is moved. If this is the case, those wires won't be needed on your application.

[enginebob]

The part number is 0280120047. I can find the part online for sale, but no info. On the wiring diagram it is called an acceleration enrichment switch. Did some tests on it, doesn't seem to do much. Took picture of it with cover off.

[Matt Cramer]

That may be a pulse generator type TPS. Totally useless with MegaSquirt if that's the case.