P0056

Tests 1 - 4:

Tests 5 - 9:

Test 10:

SYMPTOM
P0056-O2 SENSOR 2/2 HEATER CIRCUIT

TEST NOTE
This symptom is diagnosed using the test P0030-O2 SENSOR 1/1 HEATER CIRCUIT.

WHEN MONITORED
Engine Running.

SET CONDITION
The PCM detects the O2 Heater voltage is out of acceptable range. Below 0.0926 of a volt or above 0.3397 of a volt. One Trip Fault.

POSSIBLE CAUSES
- O2 heater element
- O2 sensor heater ground circuit open
- O2 sensor
- O2 heater control shorted to voltage
- O2 heater control circuit open
- O2 heater control shorted to ground
- Intermittent condition
- PCM