California Emission Regulation Applicable ATX Model
DTC P0139 DETECTION CONDITION AND POSSIBLE CAUSES
| DTC P0139 |
Middle HO2S circuit problem |
| DETECTION CONDITION |
- The PCM monitors inversion cycle period, middle HO2S output voltage inclination. The PCM detects that the voltage inclinations are below threshold consecutive 5 times
when following conditions are met, or 0.3 V or more
is detected three times even though fuel cut is performed for 3 s or more,
the PCM determines that circuit has malfunction.
MONITORING CONDITIONS
- HO2S heater, HO2S, and TWC Repair Verification Drive Mode
- Following conditions are met:
- Engine speed is 500 RPM or above.
- Engine coolant temperature is above 70 ° C {158 ° F}.
Diagnostic support note
- This is an intermittent monitor. (HO2S)
- MIL illuminates if PCM detects above malfunction condition in two consecutive drive cycles or in one drive cycle while DTC for the same malfunction has been stored in PCM.
- DIAGNOSTIC MONITORING TEST RESULTS is available.
- PENDING CODE is available if PCM detects the above malfunction condition during first drive cycle.
- FREEZE FRAME DATA is available.
- DTC is stored in the PCM memory.
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| POSSIBLE CAUSE |
- Middle HO2S deterioration
- Middle HO2S malfunction
- Looseness middle HO2S
- Pressure regulator (built-in fuel pump unit) malfunction
- Fuel pump malfunction
- Fuel filter (built-in fuel pump unit) clogged or restricted
- Fuel leakage on fuel line from fuel distribution pipe and fuel pump
- Leakage exhaust system
- Purge solenoid valve malfunction
- Purge solenoid hoses improper connection
- Insufficient compression
- Engine malfunction (Leakage engine coolant)
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