P0175

Test 1 - Test 4:

Test 5 - Test 8:

Test 9 - Test 11:

Test 12 - Test 14:

SYMPTOM
P0175-FUEL SYSTEM 2/1 RICH

TEST NOTE
This symptom is diagnosed using the test P0172-FUEL SYSTEM 1/1 RICH.

WHEN MONITORED
With the engine running in closed loop mode, the ambient/battery temperature above 20 deg. F and altitude below 8500 ft.

SET CONDITION
If the PCM multiplies short term compensation by long term adaptive and a purge fuel multiplier and the result is below a certain value for 30 seconds over two trips, a freeze frame is stored, the MIL illuminates and a trouble code is stored.

POSSIBLE CAUSES
- Good trip equal to zero
- O2 sensor heater operation
- O2 sensor
- O2 signal circuit
- O2 return circuit
- Throttle position sensor voltage greater than 0.92 volts with throttle closed
- Throttle position sensor sweep
- MAP sensor
- ECT sensor
- EVAP purge solenoid operation
- Engine mechanical problem
- Fuel filter/pressure regulator (HIGH)
- PCM