P0134

Test 1 - 4:

Test 5 - 7:

SYMPTOM
P0134-1/1 O2 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.

SET CONDITION
O2 signal voltage is between 0.35 volt and 0.58 volt for a total of 30 seconds and then O2 signal volt is 1.5 volts for 60 seconds. One trip fault.

POSSIBLE CAUSES
- Good trip equal to zero
- O2 sensor operation
- O2 sensor ground circuit open
- O2 sensor signal open
- O2 sensor ground circuit voltage drop
- O2 sensor signal circuit voltage drop
- PCM