Need help with the Codes

[vekrause]

I got a '97 Jimmy, 4wd, AT, 74K and lately its been acting up. Issues I've noticed are a big drop in MPG and a slight rise in operating temp (nothing dramatic). The SES light came on so I took it up to Adavance and they scanned it for me (the SES light went off the morning I took it up there.) Codes that the scanner provided were P0122 and P1122, both related to the TPS. The Advanced guy said I should get further diagnosis because something else could be causing the TPS to act up.

Any suggestions?

Thanks

[nighthog]

Additional diagnostics are needed to determine if the failure is in the TPS, VCM or the connection to the VCM. The TPS costs about $50 and is a simple R&R procedure. I would check the connection to the VCM and the wiring first. I don't like to R&R parts just to determine cause, but $50 is less than the average shop rate for 1 hour. If it's the VCM I'd have a service tech do the work.

[BlazerLT]

Well, check the connection to the TPS, but with the P1122, you need to change the sensor.

Easy to replace as long as you have a good Haynes or Chilton's repair manual.