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

ENGINE 605.910 in MODEL 202.125

ENGINE 605.960 in MODEL 202.128 to 31.3.96

ENGINE 605.912 in MODEL 210.010 to 31.5.96

ENGINE 606.912 in MODEL 210.020 except CODE (491) U.S. version

ENGINE 606.912 in MODEL 210.020 to 31.5.96 with CODE (491) U.S. version

Model 202 to 11/94

Fig 1: Identifying IFI Start Quantity Control Function - Model 202 To 11/94

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Model 202 as of 12/94, model 210

Fig 2: Identifying IFI Start Quantity Control Function - Model 202 As Of 12/94, Model 210

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 (B11/4) to the IFI [ERE] control module (N3/7), which, with feedback from the fuel rack position sensor (Y23/1 1), 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).

Emergency start, only model 202 to 11/94

If the IFI [ERE] control module (N3/7) receives an error message from the IFI/DFI [ERE/EVE] crankshaft position sensor (L5/6), a speed signal from the starter ring gear speed sensor (L3) will be needed for the next start.

Overvoltage protection relay location/task/design/function	Model 202	GF07.13-P-3100H
Relay module location/task/design/function	Model 210	GF07.13-P-3101H
IFI [ERE] control module location/task/function		GF07.12-P-3102H
Coolant temperature sensor location/task/design/function		GF07.04-P-5026H
Fuel temperature sensor location/task/design/function		GF07.04-P-5023H
Crankshaft position sensor location/task/design/function		GF07.04-P-4116H
Starter ring gear speed sensor location/task/function	Model 202 to 11/94	GF07.04-P-5024H
Fuel quantity actuator (IFI [ERE]) location/task/function		GF07.12-P-3131H
Fuel rack position sensor location/task/design/function		GF07.04-P-5022H