Numbering of injectors and cylinders
Nozzle | Cylinder number |
0 | 1 |
1 | 4 |
2 | 2 |
3 | 5 |
4 | 3 |
5 | 6 |
Fuel under high pressure is supplied to the injectors from the fuel rail and sprayed into the combustion chambers in a finely dispersed form. ECM block (the engine control unit) controls each injector separately using the firing order of the cylinders. In this case, the opening period of the nozzle is regulated using PWM (pulse width modulation) -signals. ECM (the engine control unit) supplies a 12 V supply voltage to each injector and, based on the programmed injection timing/volume maps and sensor signals, calculates the exact timing of the pre- and main fuel delivery phases for each cylinder. If the battery voltage drops to 9 - 6 V, then the controllability of the injector deteriorates, which worsens the environmental parameters and engine idling, and also affects the speed range of the engine. Injector failure may be accompanied by the following symptoms:
- Misfires
- Rough idle
- Reduced engine power
- Deterioration of the energy performance of the engine
- Difficult start
- Increased exhaust smoke
ECM (the engine control unit) controls the electrical conductivity of the wires of each injector (checking them for short circuits and open circuits), each injector and transient current in eCm (the engine control unit). When a defect is found in the ECM (the engine control unit) an error is logged for the tested injector. For more information refer to Fuel Charging and Controls (303-04C Fuel Charging and Controls - 2.7L Diesel)
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