Ignition On, Function - GF07.10-P-1000OGF

ENGINE 642.8 in MODEL 166 as of model year 2016 

ENGINE 642.8 in MODEL 292 

Function requirements for ignition ON, general points 

• Circuit 30

Ignition ON, general points 

For ignition ON, the engine management in the CDI control unit (N3/9) is switched on and the engine prepared for starting.

Function sequence for ignition ON 

When the ignition is switched on, the electronic ignition lock control unit (N73) sends the on-board electrical system voltage for "circuit 30" to "circuit 15" over the interior CAN (CAN B), the SAM control unit (N10) and circuit 15 relay (F58kR).

If a voltage is present at the CDI control unit at "circuit 15", the engine circuit relay 87M (F58kN) is actuated by means of a ground signal. This makes the relay close its power contact and, in accordance with the relevant electrical fuses, the voltage from "circuit 30" is passed on to the CDI control unit and the relevant engine management sensors and actuators as "circuit 87".

If a voltage is present at "circuit 87", the engine management is switched on and an output stage driver in the CDI control unit takes over further actuation of the circuit relay 87M.

Ground connection "circuit 31" takes place by the on-board electrical system battery (G1) over the on-board electrical system battery ground point at the front right (W10) and over a number of ground lines to the ground point on the front right for the lamp unit (W2).

When the engine management is switched on, the CDI control unit carries out the following functions:

• In order to provide protection against flooding cylinders, the fuel pump (M3) is actuated via the drive train CAN (CAN C) and the fuel system control unit (N118) (only the first time the ignition is switched ON after the vehicle is unlocked).
• In the IC (A1) the engine diagnosis indicator lamp (A1e58) is actuated by the CDI control unit over the electronic ignition lock control unit, via chassis CAN 1 (CAN E1) and chassis CAN 2 (CAN E2) for lamp check.
• Data are exchanged with the electronic ignition lock control unit (circuit 50 signal and drive authorization) via chassis CAN 1.
• Actuation of the glow output stage (N143) over the drive train LIN (LIN C1). The glow output stage then actuates the glow plugs for cylinders 1 to 6 (R9/1 to R9/6) on the positive side. The preglow indicator lamp (A1e16) is actuated via chassis CAN 1, the electronic ignition lock control unit, chassis CAN 2 and the IC.
• The fault memory in the CDI control unit can be read out and deleted through the diagnostic connector (X11/4).
• Diagnosis is possible via the XENTRY Diagnostics via the diagnostic CAN (CAN D) and over the diagnostic connector.
• The throttle valve actuator (M16/6) checks its return spring (by the position of the throttle valve) and may adjust the position of the actuator.