DTC P0172: Notes
DTC P0172 DETECTION & CONDITION POSSIBLE CAUSES
| DTC P0172 |
System too rich |
| DETECTION CONDITION |
- The PCM monitors the short term fuel trim (SHRTFT) and long term fuel trim (LONGFT) when under closed loop fuel control. If the fuel trim is less than the specification, the PCM determines that the system is too rich.
Diagnostic support note
- This is a continuous monitor (Fuel system).
- The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
- PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle.
- FREEZE FRAME DATA is available.
- The DTC is stored in the PCM memory.
|
| POSSIBLE CAUSE |
- Front HO2S malfunction
- Fuel line pressure malfunction
- Fuel pump unit malfunction
- Purge solenoid valve malfunction
- Fuel pump speed control malfunction
- PCM malfunction
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