P2097

Test 1 - 4:

Test 5 - 6:

SYMPTOM:
P2097-DOWN STREAM FUEL SYSTEM 1/2 RICH

TEST NOTE:
This symptom is diagnosed using the test P2096 - DOWN STREAM FUEL SYSTEM 1/2 LEAN

WHEN MONITORED:
With the engine running in closed loop mode, the ambient/battery temperature above (-7° C) 20° F and altitude below 8500 ft.

SET CONDITION
If the PCM adds downstream short term compensation to long term adaptive and a certain percentage is exceeded for two trips, a freeze frame is stored, the MIL illuminates and a trouble code is stored.

POSSIBLE CAUSES
- Good trip equal to zero
- Exhaust leak
- Engine mechanical problem
- 02 sensor
- 02 signal circuit
- 02 return circuit
- Fuel contamination