Component description Function check with diagnosis instrument Injection pump, actuator, relay Instrument menu functions The instrument has a number of menus stored in its program section. Injection pump The injection pump is a piston-type unit, located on the left of the engine. It is driven from the timing gear. The software contains two main sections, choice of language and choice of menu. The main menu is found under the choice of menu section, where the user can get information about current engine speed, coolant temperature, fuel temperature and fuel consumption. TWD740VE and TWD1231VE have an electromagnetic actuator controlled by the control unit.
The engines do not have mechanical smoke limiters. The corresponding function is integrated in the EDC system instead. Under the main menu, there are also menu functions which allow you to read about the components con- nected to the control unit, and their status, for example if the engine has exceeded its pre-set limit values, ba- sic data about the engine and a diagnostic function where the fault codes are explained in plain language. Location of injection pump, TWD740VE The following instruction summarises all the functions in the instrument.
Location of injection pump, TWD1231VE Menu operation on the instrument Actuator, (17, 18, 19) Choice of language The acutator is electromagnetic and is controlled by the control unit. It contains the following components: When the instrument is started, choose language: Scroll to relevant language: For next language, press the arrow For previous language, press the arrow Control solenoid (17) The control magnet is a solenoid, and gov- erns the movement of the control rod. Engine speed sensor (18) The engine speed sensor informs the control unit about engine speed. Select relevant language: Press the execute button when the cor- rect language is shown on the display.
Position sensor (19) The position sensor informs the control unit about control rod position. This allows the control unit to control the movement of the control rod, and to decide at every instant whether to increase or reduce the control so- lenoid current. NOTE! When the language has been chosen, the in- strument has to be re-started to initialise the new choice of language When the language has been chose, the next menu is displayed automatically. This is the main menu. The display then shows the first menu underneath the main menu, which is engine speed.
Electromagnetic actuator, EDC Relays, (5, 6, 7) The three relays, starter relay (5), main relay (6), and stop relay ( 7) are located in the junction box. This is located on one side of the engine. The start and stop functions are controlled by a switch- ing relay each. The three relays are identical, and mutu- ally interchangeable. TWD740VE TWD1231VE 20 33