P0051

Tests 1 - 4:

Tests 5 - 6:

SYMPTOM
P0051-2/1 O2 SENSOR HEATER CIRCUIT LOW

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

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

SET CONDITION
If voltage is lower than a specified voltage at start of test.

POSSIBLE CAUSES
- Fused ignition feed circuit open
- Heater control circuit open
- Heater element check
- Intermittent condition
- PCM