GF07.15-W-2001MA | Start procedure, function | 5.12.06 |
ENGINE 900.9 in MODEL 970, 972, 975, 976 with BODY 972.890
ENGINE 902.9 in MODEL 950, 952, 953, 954 with BODY 940.890
ENGINE 902.9 in MODEL 970, 972, 974, 975, 976 with BODY 972.890
ENGINE 904.9 in MODEL 375.1 with BODY 375.850
ENGINE 904.9 in MODEL 958.0 with BODY 958.860
ENGINE 904.9 in MODEL 970, 972, 975, 976 with BODY 972.890
ENGINE 906.9 in MODEL 374.5 with BODY 374.860
ENGINE 906.9 in MODEL 375.3 with BODY 375.820
ENGINE 906.9 in MODEL 950, 952, 953, 954 with BODY 940.890
ENGINE 906.9 in MODEL 958.0 with BODY 958.860
ENGINE 906.9 in MODEL 958.2 with BODY 958.870
ENGINE 906.9 in MODEL 970, 972, 974, 975, 976 with BODY 972.890
ENGINE 924.9 in MODEL 958.0 with BODY 958.860
ENGINE 924.9 in MODEL 970, 972, 974 with BODY 972.890
ENGINE 926.9 in MODEL 950, 952, 953, 954 with BODY 940.890
ENGINE 926.9 in MODEL 958.2 with BODY 958.870
W07.15-1345-79
Shown on engine 906.9
0 Ignition OFF
1 Circuit 15R ON
2 Circuit 15 ON
3 Circuit 50
A3 Drive control (FR) control unit
A6 Engine control (MR) control unit
A22 Parameterizable special module (PSM) control unit*
A42 Immobilizer read-out electronics
B10 Fuel temperature sensor
B15 Crankshaft position sensor
B16 Camshaft position sensor
B65 Coolant temperature sensor
Z1 CAN star point cab dash support
* Only for vehicles with code
(EM8) Parameterizable special module with body and trailer CAN bus (ISO 11992)
or code (EM9) Parameterizable special module with body and trailer CAN bus, ISO 11898 instead of 11992
B111 Charge air temperature and boost pressure combination sensor
CAN 1 Vehicle CAN
CAN 4 Engine CAN
M1 Starter
S1 Drive switch
S10 Start engine button
S11 Stop engine button
Y6 Cylinder 1 unit pump
Y7 Cylinder 2 unit pump
Y8 Cylinder 3 unit pump
Y9 Cylinder 4 unit pump
Y10 Cylinder 5 unit pump
Y11 Cylinder 6 unit pump
General
The engine can be started:
with the drive switch (S1) using the ignition key
with the Start engine button (S10)
via the parameterizable special module (PSM) control unit (A22)
Only for vehicles with code (EM8) Parameterizable special module with body and trailer CAN bus (ISO 11992) or code (EM9) Parameterizable special module with body and trailer CAN bus, ISO 11898 instead of 11992
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Requirements
Voltage supply (terminal 30 and terminal 15) exists to the engine control (MR) control unit (A6).
Vehicle immobilizer (WSP) deactivated which means that the engine control (FMR) control unit (A6) has received the valid transponder code over the read-out electronics (A42) and could therefore recognize the correct ignition key.
Lock removed from starter function, which means:
Transmission in neutral when the start command was given over the engine start button (S10)
Auxiliary drive, when present, switched off
Engine stopped or the engine speed is <50 rpm
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Function
If all conditions are fulfilled and the ignition key is turned into position terminal 50 (3) and held there, the engine start button (S10) pressed or an appropriate message is sent from the parameterizable special module (PSM) (A22), the engine control (FR) control unit (A6) activates the starter solenoid on the starter (M1) over a series relay.
The starter (M1) sets the engine in motion and the engine control (MR) checks whether the starter (M1) is turning the engine at a minimum speed of 50 rpm In addition, the control waits until it has detected the compression stroke of cylinder 1 by means of signals from the crankshaft position sensor (B15) and from the camshaft position sensor (B16) so that it can then calculate the start of delivery (to control the start of injection).
The required fuel injection amount is also being calculated at the same time according to the current operating condition of the engine and is controlled through appropriate actuation of the solenoid valves in the unit pumps.
If the engine starts while the ignition key is held in position terminal 50 (3) of the drive switch (S1) or the engine start button (S10) is still being pressed and the engine reaches a speed of approx. 450 rpm for a warm engine or approx. 650 rpm for a cold engine, then actuation of the starter (M1) is interrupted (starter break-off speed). The pinion is withdrawn from toothing on the flywheel while the engine control (MR) shifts into the desired regulating mode.
The increased starting amount required is of course increased, as required, by the engine control (FR) control unit (A6).
The starting time is limited to 90 s to avoid overloading the starter (M1) for extremely low outside temperatures which leads to poorer starting behavior. Actuation of the starter (M1) and the solenoid valves in the unit pumps is interrupted. It is then only after a short waiting time (at the earliest 1 s after switching off the starter) that a new start procedure can be begun from the beginning. The start time can, however, be made significantly shorter for vehicles with code (M89) Flame starting system.