P0052

Test 1 - 3:

Test 4 - 6:

SYMPTOM
P0052-O2 SENSOR 2/1 HEATER CIRCUIT HIGH

TEST NOTE
This symptom is diagnosed using the P0031-O2 SENSOR 1/1 HEATER CIRCUIT LOW.

WHEN MONITORED
Battery voltage above 10.6 volts, ECT below a certain Temp but within a set Temperature difference of Battery temp sensor.

SET CONDITION
Desired state does not equal Actual state.

POSSIBLE CAUSES
- O2 Heater test
- O2 Sensor heater element
- (F142) fused ASD relay output circuit open
- Heater Control circuit open
- Heater Control circuit shorted to ground
- PCM