Pic. 2.237. Scheme of the relationship between fault codes and the characteristics of the process of driving a car
1. If the same malfunction is detected and persists for two driving cycles, the malfunction indicator lamp will automatically turn on.
2. The malfunction indicator lamp goes out if no malfunction is detected for 3 consecutive driving cycles.
3. Diagnostic trouble code (DTC) is written to the ECU memory when a malfunction is detected after two driving cycles in a row. The malfunction indicator lamp comes on when a malfunction is detected in the second driving cycle.
If a misfire is detected, a fault code is stored and the malfunction indicator lamp lights up immediately after the fault is detected.
4. The fault code is automatically cleared from the ECU memory if the same fault is not detected within 40 driving cycles.
Pic. 2.238. Connection diagram of the absolute pressure sensor with the computer
Note. The engine warm-up cycle corresponds to a sufficient time of its operation, during which the temperature of the coolant has increased by at least 4.5°C from the moment the engine was started and reaches a value of at least 70°C.
The driving cycle includes starting the engine and moving the car after the start of the regulation of the composition of the mixture according to the signals of the oxygen sensors.