DTC P0031: O2 Sensor 1/1 Heater Circuit Low Or P0037: O2 Sensor 1/2 Heater Circuit Low: Notes

NOTE: For component location, see COMPONENT LOCATIONS . For connector identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see WIRING DIAGRAMS . In testing procedures Alpha/Numeric character in parentheses (i.e. K4) designates circuit. After each repair procedure has been completed, reconnect all components. Perform POWERTRAIN VERIFICATION TEST VER-5 under VERIFICATION TESTS to ensure system is functioning properly.

The sensors are monitored for a low setting when the battery voltage is more than 10.6 volts, ASD is powered up and O2 heater is on. DTC is set when desired state does not match actual state.