Afterrunning
| Afterrunning |
Afterrunning is a function that is activated when the engine control module pin 39 (+15) has become dead, i.e. the ignition has been turned to OFF. The control module determines whether the main relay should be turned off or not based on the presence or absence of + 15.
| + 15 present |
If +15 is present, the ignition is considered to be in the ON position. If +15 disappears less than 1 second after being connected, the control module automatically goes over to afterrunning.
| +15 absent |
If +15 disappears, the ignition is considered to be in the OFF position. The proper afterrunning then starts.
| Afterrunning duration |
Afterrunning duration is determined by internal calculations in the EDC 15 control module (approx. 4 s) and DICE, which requires information on the engine temperature to control the radiator fan and keep the EDC 15 control module active for approx. 40 s.
| Checking control valve shut-off |
If the vehicle speed is below 5 km/h and the engine speed below 1300 rpm, the control valve shut-off is tested. The engine is then turned off only by the control valve shut-off. If the engine speed then drops below 200 rpm within 1.3 seconds, the control valve shut-off function is correct. If this does not happen, a diagnostic trouble code is generated.
To determine the nature of the fault, the diesel pump control module sends a message on the P-bus, which is read by the EDC 15 control module.
If a fault in the control valve shut-off is registered or if the vehicle or engine speed limits are exceeded, the injected fuel quantity will be set to 0 mg/combustion as well. If the vehicle or engine speed limits are exceeded, control valve shut-off cannot be tested as the engine will stop anyway, because the injected fuel quantity has been set to 0 mg/combustion.
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