Ignition ON, function - GF07.10-P-1000OM

ENGINE 651.9 in MODEL 204 

ENGINE 651.9 in MODEL 207, 212 (except 212.098/298) up to model year 2014 

ENGINE 651.9 in MODEL 218 up to model year 2014 

Function requirements for ignition ON, general points 

• Circuit 15 ON

Ignition ON, general points 

With ignition ON, the engine timing 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) forwards the on-board voltage from "circuit 30" to "circuit 15" over the circuit 15 relay (N10/1kJ). If a voltage is present at the CDI control unit at "circuit 15", the engine circuit 87 relay (N10/1kN) is actuated by means of a ground signal.

This causes the relay to close its power contact and, according to the corresponding electrical fuses, the "circuit 30" voltage is passed on as "circuit 87" to the CDI control unit and to the corresponding sensors and actuators of the engine timing. If a voltage is present at "circuit 87", the engine timing is switched on and an output stage driver in the CDI control unit takes over actuation of the engine circuit 87 relay. The "circuit 31" ground connection is made from the on-board electrical system battery (G1) via the front right battery ground point (W10) and via multiple ground lines to the left major assembly compartment electronics ground point (W16/5).

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

• To ensure full flow, the fuel pump (M3) is actuated via the fuel pump relay (N10/2kD) (model 204.0/9 up to 05/2009 and model 212.0 up to 08/2009) (only at first time ignition ON after unlocking the vehicle).
• To ensure full flow, the fuel pump is actuated via the drive train CAN (CAN C) and by the fuel system control unit (N118) (model 204.0/9 up to 06/2009, model 204.2/3, model 207.3/4., model 212.0 as of 09/2009 and model 212.2, model 218) (only at first time ignition ON after unlocking the vehicle).
• In the instrument cluster (A1) the engine diagnosis indicator lamp (A1e58) is actuated for the lamp check by the CDI control unit via the chassis CAN (CAN E).
• Data are exchanged with the electronic ignition lock control unit (circuit 50 signal and drive authorization) via the chassis CAN.
• Actuation of the glow output stage (N14/3) via drive train LIN (LIN C1). The glow output stage then responds by actuating the glow plugs (R9) on the positive side. The preglow indicator lamp (A1e16) is actuated via the chassis CAN.
• The fault memory in the CDI control unit can be read out and deleted via the diagnostic connector (X11/4).
• Diagnosis is possible with Xentry Diagnostics via diagnostic CAN (CAN D) and via the diagnostic connector.
• The throttle valve actuator (M16/6) checks its return spring (by the position of the throttle valve) and adapts the position of the actuator, if necessary.