2.3.3. Electric control unit : ECU z This electric control unit is used to control the engine feed fuel. z ECU is connected with various sensors, control the engine to keep the optimum condition on the basis of input values from this sensors. CAUTION: Do not connect or disconnect the ECU to/from the wiring harness without first removing the negative (-) battery cable from the battery. Do not perform remove the inner parts of ECU. 2.3.4. Common rail system z Pressure generation and fuel injection are completely decoupled from each other in the "Common Rail" fuel injection system. The injection pressure is generated independent of engine speed and injected fuel quantity stored in the ECU.
DL06 Diesel Engine Technical Information 21