GF07.61-P-4009MOR ME-SFI Synchronization of Fuel Injection and Firing Order, Function

GF07.61-P-4009MOR ME-SFI Synchronization Of Fuel Injection And Firing Order, Function
- refinement package
- as of model year 09


Function requirements synchronization of fuel injection and firing order, general points
^ Circuit 87M ON (engine control ON)
^ Engine running

Synchronization of the fuel injection and firing order, general points
synchronization of the injection and firing order is achieved for actuation of the ECI ignition module on the right and left cylinder bank (N92/1, N92/2) and the fuel injection valves (Y62) by the ME-SFI [ME] control unit (N3/10).
Furthermore the synchronization is required for the knock control and the fuel shutoff on the individual cylinders.

The ME-SFI [ME] control unit synchronizes the injection and firing using the signals from the following sensors:
- Camshaft Hall sensor, right cylinder bank (B6/3)
- Crankshaft position sensor (L5), engine speed

Synchronization of the fuel injection and firing order, function sequence
When the engine is stared, the injection sequence is determined according to the firing order in the voltage signals from the crankshaft position sensor and camshaft Hall sensor. To do this, ignition TDC must be detected in cylinder 1.

The ME-SFI [ME] control unit detects TDC position in cylinders 1 and 6 on the 2nd. negative signal edge after the gap in the signal from the crankshaft position sensor. If the signal from the Hall sensor camshaft is at 0 V (low) at this time, the ME-SFI [ME] control unit processes it in order to detect ignition TDC in cylinder 1.

If the voltage signal from the camshaft Hall sensor fails, ignition and injection take place after 360° KW (CKA), in order to allow an emergency start.

Component Identification: