dogfriend
Human-Animal Hybrid
- Joined
- July 22, 2002
- Messages
- 7,556
- Reaction score
- 16
- City, State
- Carmichael, CA
- Year, Model & Trim Level
- '97 Sport 4x4
I would try removing the HO2S signal and signal return wires (both sides of the sensor) to make sure you are not getting a short on either side of the O2 sensor circuit.
If you still have Code 543 with the secondary fuel signal disconnected and the O2 sensor(s) disconnected, then by the earlier article that Mr. Shorty posted it appears that you have an internal fault in the PCM.
If you still have Code 543 with the secondary fuel signal disconnected and the O2 sensor(s) disconnected, then by the earlier article that Mr. Shorty posted it appears that you have an internal fault in the PCM.