Notes Workshop manual EDC Fuel system TWD740VE, TWD1231VE Contents Safety information .................................................... 2 Function check with diagnosis program ........... 31 General information ................................................. 5 Function check with diagnosis instrument ....... 32 General information............................................. 32 Diagnosis instrument .......................................... 32 Connection .......................................................... 32 Instrument menu functions ................................ 33 Menu operation on the instrument .....................
33 Repair instructions .................................................. 6 Special tools ........................................................... 10 Tightening torque .................................................. 10 Function check with diagnosis button ............... 38 General information............................................. 38 Reading fault codes ............................................ 38 Erasing fault codes ............................................. 38 Specifications ......................................................... 11 Design and function .............................................. 13 Component description ........................................
15 EDC Fuel system ............................................... 15 Control unit .......................................................... 17 IInjection pump, actuator, relay ......................... 20 Sensor, coolant, charge air temperature, fuel temperature and charge pressure ............... 21 Diagnostic button, test connection .................... 22 EDC fault codes ...................................................... 39 Electric fault tracing in EDC systems ................. 42 Measurement of components in the injection pump .............................................. 42 Measurement of charge air temperature sensor .......................................
43 Measurement of coolant temperature sensor ............................................. 44 Signals to engine ................................................... 23 Curves: Pre-heating and post-heating ............... 23 Input signals........................................................ 23 Wiring diagrams ..................................................... 46 Wiring diagram for TWD740VE engine .............. 46 Wiring diagram for TWD1231VE engine ............ 48 Wiring diagram for control panel ........................ 50 Calibration of accelerator linkage ....................... 25 Idling adjustment ................................................
26 Operation of engines with the EDC system ....... 27 Repair instructions ................................................ 28 General advice on working with EDC ................ 28 Changing the control unit ................................... 28 Venting the fuel system ..................................... 30 52 1