DTC P2196 [LF]: Notes
DTC P2196 (LF) DETECTION CONDITION AND POSSIBLE CAUSE
| DTC P2196 |
A/F sensor signal stuck rich |
| DETECTION CONDITION |
- The PCM monitors the A/F sensor output current when the following conditions are met. If the output current is less than 0.85
for 25 s
, the PCM determines that the A/F sensor signal remains rich.
MONITORING CONDITIONS
- ECT: more than 70°C {158°F}
- Engine speed: 1,000-3,200 RPM
- MAF amount: 6-80 g/s {0.80-10.58 lb/min}
- Target A/F feedback system status: feedback control
- Output voltage from the middle HO2S: less than 0.7 V
Diagnostic support note
- This is an intermittent monitor (A/F sensor, HO2S).
- 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 (Mode 2/Mode 12) is available.
- The DTC is stored in the PCM memory.
|
| POSSIBLE CAUSE |
- A/F sensor heater malfunction
- A/F sensor malfunction
- Leakage exhaust system
- A/F sensor deterioration
- MAF sensor malfunction
- Fuel injector improper operation
- Fuel injector malfunction
- Fuel injector related wiring harness malfunction
- Fuel supply system malfunction or improper fuel line pressure
- Pressure regulator (built-in fuel pump unit) malfunction
- Fuel pump unit malfunction
- PCM malfunction
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