Function Explanation (DTC Detection Outline)
WARNING: This page is about a different variant/trim than selected.
- The PCM detects the oxygen concentration in the exhaust gas from the A/F sensor signal and performs fuel injection amount feedback to maintain the optimum air/fuel ratio. If a condition in which the feedback correction amount is small (fuel injection amount being decreased) continues for the specified time, a feedback correction amount malfunction is determined, and a DTC is stored. The feedback correction amount has a [Fuel feedback correction amount] for the air/fuel ratio and a [Fuel learning correction amount] for fuel injector deterioration over time.
- [Fuel feedback correction amount (SHRT_FUEL_TRIM)] and [Fuel learning correction amount (LONG_FUEL_TRIM)] can be verified from the M-MDS PID item.
- The specified period of time has elapsed while the sum of the fuel feedback correction amount [SHRT_FUEL_TRIM] and the fuel learning correction amount [LONG_FUEL_TRIM] is the threshold or less and the fuel learning correction amount [LONG_FUEL_TRIM] is the threshold or less. Engine coolant temperature: 0-45°C {32-113°F}, 60°C {140°F} or morePCM COMPONENT OPERATIONS
Component No. Refer to 1 Correction amount (%) 2 0 (%) 3 Threshold (%) of fuel learning correction amount [LONG_FUEL_TRIM] 4 Threshold (%) of sum of fuel feedback correction amount [SHRT_FUEL_TRIM] and fuel learning correction amount [LONG_FUEL_TRIM] 5 Fuel learning correction amount (normal) 6 Sum of the fuel feedback correction amount [SHRT_FUEL_TRIM] and fuel learning correction amount [LONG_FUEL_TRIM] (normal) 7 Fuel learning correction amount (abnormal) 8 Sum of the fuel feedback correction amount [SHRT_FUEL_TRIM] and fuel learning correction amount [LONG_FUEL_TRIM] (abnormal) 9 Specified period of time or more 10 Time - The specified period of time has elapsed while the fuel feedback correction amount reaches the minimum value. Engine coolant temperature: 0-45°C {32-113°F}, 60°C {140°F} or more
- The specified period of time has elapsed while the sum of the fuel feedback correction amount [SHRT_FUEL_TRIM] and the fuel learning correction amount [LONG_FUEL_TRIM] is the threshold or less and the fuel learning correction amount [LONG_FUEL_TRIM] is the threshold or less. Engine coolant temperature: 0-45°C {32-113°F}, 60°C {140°F} or more
PCM COMPONENT OPERATIONS
| Component No. | Refer to |
|---|---|
| 1 | Correction amount (%) |
| 2 | 0 (%) |
| 3 | Lower limit value (%) |
| 4 | Normal |
| 5 | Abnormal |
| 6 | Specified period of time or more |
| 7 | Time |