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 large (fuel injection amount being increased) 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 more and the fuel learning correction amount [LONG_FUEL_TRIM] is the threshold or more. Engine coolant temperature: 0-45°C {32-113°F}, 60°C {140°F} or moreCOMPONENT OPERATIONS
Component No. Refer to 1 Correction amount (%) 2 Threshold (%) of sum of fuel feedback correction amount [SHRT_FUEL_TRIM] and fuel learning correction amount [LONG_FUEL_TRIM] 3 Threshold (%) of fuel learning correction amount [LONG_FUEL_TRIM] 4 0 (%) 5 Sum of the fuel feedback correction amount [SHRT_FUEL_TRIM] and fuel learning correction amount [LONG_FUEL_TRIM] (abnormal) 6 Specified period of time or more 7 Fuel learning correction amount (abnormal) 8 Fuel learning correction amount (normal) 9 Sum of the fuel feedback correction amount [SHRT_FUEL_TRIM] and fuel learning correction amount [LONG_FUEL_TRIM] (normal) 10 Time - The specified period of time has elapsed while the fuel feedback correction amount reaches the maximum value. Engine coolant temperature: 0-45°C {32-113°F}, 60°C {140°F} or moreCOMPONENT OPERATIONS
Component No. Refer to 1 Correction amount (%) 2 Upper limit value (%) 3 0 (%) 4 Specified period of time or more 5 Abnormal 6 Normal 7 Time
- 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 more and the fuel learning correction amount [LONG_FUEL_TRIM] is the threshold or more. Engine coolant temperature: 0-45°C {32-113°F}, 60°C {140°F} or more