IFI start quantity control function - GF07.12-P-3000HA

ENGINE 605.960 in MODEL 202.128 as of 1.4.96, 202.188 

ENGINE 605.912 in MODEL 210.010 as of 1.6.96, 210.210 /610 

ENGINE 606.912 in MODEL 210.020 as of 1.6.96 with CODE (491) U.S. version 

ENGINE 606.962 in MODEL 210.025 /225 

ENGINE 606.961 in MODEL 140.135 

ENGINE 605.962 in MODEL 210.015 /215 

Fig 1: Identifying IFI Start Quantity Control Function

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Task 

To regulate the start quantity in relation to the operating condition and independent of the position of the accelerator pedal.

Function 

The IRI/DFI [ERE/EVE] crankshaft position sensor (L5/6) detects the position of the crankshaft and the engine speed and sends this data to the IFI [ERE] control module (N3/7). In addition, a signal to prepare the required start quantity is sent via the coolant temperature sensor (B11/) to the IFI [ERE] control module (N3/7), which, with feedback from the fuel rack position sensor (Y23/1 l1), forwards the signal to the fuel quantity actuator (Y23/1).

After the engine has started and at an engine speed of >600 rpm, the start quantity control does not operate.

The start quantity is controlled up to an engine speed of 600 rpm by the start quantity control independently of the accelerator pedal position.

Only after the engine speed exceeds 600 rpm (dependent on coolant temperature) can it be controlled using the accelerator pedal.

The higher the coolant temperature the lower the start quantity released by the IFI [ERE] control module (N3/7).