Calibration of accelerator linkage Operation of engines with the EDC system Idling adjustment Idling speed is adjusted to 600 rpm when the engine is delivered. If necessary, the idling speed can be adjust- ed in the range from 550-1000 rpm (TWD740VE) and 550-900 rpm (TWD1231VE). Starting the engine NOTE! Adjustment must be done on a warm engine. The EDC system is equipped with software for control- ling the way the engine is warmed up before starting, and for continued warming after starting, in accordance with the diagram in the “Signals to engine“ chapter. 1. Enter calibration mode as in items 1-5. 2. Start the engine.
You can now adjust the idling speed with the accelerator, within the engine speed range as above. (This area is equal to the working range of the control.) When the start button is pressed, pre-heating of the engine starts, and then a start attempt is done for up to 30 seconds. When the engine has started, post- heating starts, in accordance with the diagram in the “Signals to engine“ chapter. 3. Set the desired engine speed and press the switch. Idling speed is now stored in the control unit memory. To start the engine at once (i.e. without pre-heating) press the start button twice, then keep it depressed during the start attempt.
The amount of fuel supplied during starting is deter- mined by the coolant temperature. NOTE! Engines with EDC need to be cranked longer by the start motor than equivalent engines with mechani- cal injection. This is because the EDC system pre- heats the combustion chambers during starting, to re- duce exhaust emissions. Stopping the engine Engines with the EDC system are provided with elec- tronic engine shut-off. To stop the engine, press the stop button, and the current will be cut and the engine will be stopped by the stop relay. Do not use the main switch, since transients can be generated by the alternator. This could permanently damage the alternator and con- trol unit. 26 27