Special injectors with hydraulic servo-system and electrical triggering element (solenoid valve) are used with the common rail system in order to achieve efficient start of injection and precise injected fuel quantity.
Metering and spray preparation of the diesel fuel, as needed by the engine according to the engine map, Realization of pilot and main injection and post injection if required.
Pilot injection is used to reduce the engine noise and vibration and post injection is used to reduce the NO and N0X in the exhaust gas.
Control of injected quantity and injection timing based on the system pressure and enerizing time as actuated by the ECM. The injected fuel quantity is now defined by the injector opening time and rail pressure.
Injection is terminated when the solenoid valve is no longer triggered and closes as a result.
In case of more than 2 injectors failure, the engine symptoms will occur the running engine stall and the starting impossible.
If the signal is below threshold value, the ECM judged this as a fault and DTC is set.
Item | Detecting Condition | Possible Cause |
DTC Strategy | ● Circuit continuity check | ● Open in power circuit ● Short to ground in control circuit ● Open in control circuit circuit ● Faulty injector ● Faulty ECM |
Enable Conditions | ● Engine run | |
Threshold Value | ● Load drop error : load drop is detected if during energizing the minimum current/min = 3A is not reached ● Fast current decrease error : a fixed time after the energizing period the current has to decrease below/min = 3A | |
Diagnostic Time | ● 0.3 sec. | |
MIL Fuel Limit Fuel Cut EGR Off | ● Yes ● Yes ● No ● No |
Injector | |
Resistance | 0.365 ± 0.055 Ω at 20°C |
