P0140

Test 1:

Tests 2 - 5:

Tests 6 - 8:

SYMPTOM
P0140-1/2 O(2) SENSOR STAYS AT CENTER

TEST NOTE
This symptom is diagnosed using the test P0134-1/1 O(2) SENSOR STAYS AT CENTER.

WHEN MONITORED
Engine running for greater than 121 second. Coolant Temperature greater than 66 °C (150.8 °F). Engine in closed loop fuel control mode. Vehicle Speed greater than 40 MPH.

SET CONDITION
O(2) signal voltage is between 0.35 volt and 0.58 volt for a total of 30 seconds and then O(2) signal volt is 1.5 volts for 60 seconds. Two trip fault.

POSSIBLE CAUSES
- Intermittent condition
- O(2) sensor operation
- O(2) sensor ground circuit open
- O(2) sensor signal open
- O(2) sensor ground circuit voltage drop
- O(2) sensor signal circuit voltage drop
- PCM