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

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


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

Synchronization of the fuel injection and firing order, general points
Synchronization of the injection and firing order is processed by the ME-SFI control unit (N3/10) in order to actuate the ECI ignition modules of the RH and LH cylinder banks (N92/1, N92/2) and the fuel injection valves (Y62).
Furthermore the synchronization is required for the knock control and the fuel shutoff on the individual cylinders.

The ME-SFI 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), motor 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 (Top Dead Center) must be detected in cylinder 1.

The ME-SFI 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 control unit processes it in order to detect ignition TDC in cylinder 1.

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

Component Identification: