Looking for a good flow chart/diagnostic procedure for TPS code 21

[Kra5379]

My 1983 Cutlass Supreme w/V6 3.8L and E2ME carburetor keeps setting code 21 for “Throttle position (TP) sensor-voltage high“ I’ve gone through the different service manuals I have that even touch on servicing or diagnosing the TPS and I feel like there has to be a better diag procedure. I know I’m probably being too optimistic but was still curious to hear what everyone else has found to be somewhat effective/efficient

 

[Jim Rockford]

did you check the voltage coming out of the sensor to see if it was set too high?
should be the blue and black wires coming out of the plug.

 

[57 Handyman]

Kra5379, unless you are a purist and stickler on documentations for diagnostics of your classic, it seems that any GM service manual should be sufficient to direct you to a solution. If the documentation is similar, regardless of the make and model vehicle, then it shouldn't make much of a difference if wire colors are different. I have found GM service manuals to be great in diagnosing error codes. On my 92 Chevy S-10, upon seeing the TPS code and assessing it against observations of engine performance, TPS replacement cured the problem. Good luck!