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

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

ENGINE 651.9 in MODEL 218 as of model year 2014 

Function requirements for ignition ON, general points 

• Terminal 30

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) operating via the interior CAN (CAN B) and the front SAM control unit with fuse and relay module (N10/1) switches on the engine compartment circuit 15 relay (N10/1kJ). The "circuit 15 ON" signal is sent redundantly via chassis CAN 1 (CAN E1) to the CDI control unit. The circuit 15 relay passes the on-board voltage from "circuit 30" onto "circuit 15". 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 ground connection "terminal 31" takes place by the on-board electrical system battery (G1) over the battery ground point on the front right (W10) and a number of ground lines to the electronic major assembly space ground point on the left (W16/5) or major assembly space ground point on the right (W16/6) (with code (494) USA version) as of 01.09.13.

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

• For cylinder flooding protection, the fuel pump (M3) is actuated via the drive train CAN (CAN C) and via the fuel system control unit (N118) (only the first time the ignition is switched ON after the vehicle is unlocked).
• In the instrument cluster (A1), the engine diagnosis indicator lamp (A1e58) is actuated via chassis CAN 1, the front SAM control unit with fuse and relay module and chassis CAN 2 (CAN E2) for a lamp check.
• Data is exchanged with the electronic ignition lock control unit (circuit 50 signal and drive authorization) via chassis CAN 1.
• 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 chassis CAN 1, front SAM control unit with fuse and relay module and chassis CAN 2.
• 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 through the position of actual value potentiometer 1 (M16/6r1) and performs, where necessary, an actuator adaptation by actuating the actuator motor (M16/6m1).