P0031

Tests 1 - 2:

Tests 3 - 7:

SYMPTOM
P0031-1/1 O2 SENSOR HEATER CIRCUIT LOW

WHEN MONITORED
Battery voltage above 10.6 volts, ASD is powered up, and O2heater is ON.

SET CONDITION
Desired state does not match Actual state.

POSSIBLE CAUSES
- Intermittent condition
- Heater element check
- Fused ASD relay output circuit open
- Heater control circuit open
- Heater control circuit shorted to ground
- PCM