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Starting, function - GF07.10-P-1001OGA

ENGINE 642.8 in MODEL 207 as of 6/1/13, 212, 218 as of model year 2014 

Starting function requirements, general points 

Starting, general points 

The starter control system in the CDI control unit (N3/9) is responsible for actuation and shutoff of the starter (M1).

For starting, the CDI control unit reads the following signals:

The CDI control unit coordinates the injection sequence during starting based on the signals from the crankshaft Hall sensor and from the camshaft Hall sensor.

The CDI control unit actuates the following components to start the engine:

IMPORTANT Fuel pump actuation

Actuation of the fuel pump takes place both directly and via the drive train CAN by the FSCU (N118).

The start quantity control in the CDI control unit serves to calculate a specific start quantity at engine start irrespective of the position of the accelerator pedal sensor (B37).

Function sequence for start 

The function sequence is subdivided into the following steps:

Function sequence for start begin 

When transmitter key (ignition key (A8/1)) is moved to the start position, the CDI control unit receives the "circuit 50 signal" from the electronic ignition lock control unit via chassis CAN 1. The CDI control unit actuates the circuit 50 starter relay (N10/1kM) by means of a ground signal. The power contact on the starter relay closes and the starter solenoid switch is supplied at "circuit 50" with voltage from "circuit 30".

IMPORTANT ENGINE 642.8 in MODEL 207 as of 6/1/13, 212, 218 as of model year 2014 with CODE U77 (Diesel Emission control BLUETEC (SCR)) For vehicles with BLUETEC (SCR) diesel exhaust treatment, no start enable is issued from the AdBlue® control unit (N118/5) if the AdBlue® tank is empty and the number of permissible engine starts with an empty AdBlue® tank is at zero.

IMPORTANT If the CDI control unit detects that the engine is running via the crankshaft Hall sensor and the message "circuit 61 ON" and that the starting procedure has ended via the message "circuit 50 OFF", the driver will then be able to influence the injection quantity and thus the engine speed via the accelerator pedal sensor.

Function sequence for start end (with automatic transmission) 

Starter control is carried out automatically by the CDI control unit (touch start). This means that once the start process is initiated, switching off "circuit 50" will have no further influence on the start procedure.

When the engine cranking speed has reached 400 to 700 RPM, or after a starting time of 5 to 40 s (dependent on coolant temperature), the CDI control unit interrupts negative activation of the circuit 50 starter relay and thus terminates the starting procedure.

Function sequence for start end (with manual transmission) 

On reaching an engine cranking speed of 400 to 700 RPM or upon disappearance of the "circuit 50 signal", the CDI control unit interrupts negative actuation to the circuit 50 starter relay and thus terminates the starting procedure.

IMPORTANT If there is a repeat start after the end of the starting procedure, a waiting period of about 1.5 to 3 s is applied. This occurs in order to prevent meshing of the rotating pinion of the starter in the starter ring gear (ring gear protection).

  Electrical function schematic for starting ENGINE 642.8 in MODEL 207 as of 6/1/13 as of model year 2014 PE07.10-P-2701-97EAJ
ENGINE 642.8 in MODEL 212 as of model year 2014 PE07.10-P-2701-97DAM
ENGINE 642.8 in MODEL 218 as of model year 2014 PE07.10-P-2701-97XAE
  Overview of system components for common rail diesel injection (CDI)   GF07.16-P-9997OG
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