DTC P0031-O2 Sensor 1/1 Heater Circuit Low: Notes

Fig 1: Sensor 1/1 Heater Circuit - Circuit Diagram

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article.

• When Monitored: 

  Battery voltage above 10.6 volts, ASD is powered up, and O2 heater is powered. 

• Set Condition: 

  Desired state does not match Actual state. One Trip Fault. Three good trips to turn off the MIL. 

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding.