Mercedes-Benz ML320. Service manual - part 384

 

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Mercedes-Benz ML320. Service manual - part 384

 

 

Fig. 11: Identifying ME-SFI Ignition System Signal Assignment - Signal Assignment Engine 112 

ME-SFI IGNITION SYSTEM SINGLE ASSIGNMENT - GF15.12-P-0001-02B 

Fig. 12: Identifying ME-SFI Ignition System Signal Assignment - Signal Assignment Engine 113 

  

TNA rpm signal on ME2.8 with 3 pulses for each engine revolution 

ME-SFI IGNITION SYSTEM FUNCTION - GF15.12-P-0001F 

ENGINE 104.941 /943 /944 /991 /994 as of 1.8.96

 

2001 Mercedes-Benz ML320 

1998-2005 ENGINE Electrical System - Engine - 163 Chassis

  

me 

 

ENGINE 104.995  

with CODE (494a) USA version  

with CODE (807) Model year 1997  

with CODE (808) Model year 1998  

with CODE (498) as of Model Year 97 Japanese version  

ENGINE 111.921 /942 as of 1.9.98,  

111.943,  

111.944 as of 1.8.96,  

111.946 as of 1.6.98,  

111.947/973,  

111.975 as of 1.8.96  

ENGINE 111.945  

in MODEL 208.335 /435 as of 1.6.98,  

202.020/080 as of 1.9.98  

ENGINE 111.974  

with CODE (494a) USA version  

with CODE (807) Model year 1997  

with CODE (808) Model year 1998  

ENGINE 
112.910 /911 /912 /913 /914 /916 /917 /920 /921 /922 /923 /940 /941 /942 /943 /944 /946 /947 /949 /953 /954 /95

ENGINE 113.940 /941 /942 /943 /948 /960 /961 /963 /965 /966 /967 /968 /969  

ENGINE 119.980 /981 /982 /985  

ENGINE 120.982/983  

ENGINE 137.970  

 

2001 Mercedes-Benz ML320 

1998-2005 ENGINE Electrical System - Engine - 163 Chassis

  

me 

 

Fig. 13: Identifying ME-SFI Ignition System Components 

Signal assignment  

 

2001 Mercedes-Benz ML320 

1998-2005 ENGINE Electrical System - Engine - 163 Chassis

  

me 

 

Fig. 14: Identifying Signal Assignment - Shown On Engine 119 

Function  

When the crankshaft is rotating, an alternating voltage is generated in the crankshaft position sensor by the teeth 
of the driven plate. In this case, each tooth generates an alternating voltage signal. No voltage is generated 
through the gap of 2 missing teeth. The ME-SFI control unit detects the TDC position of the crankshaft with the 
2nd negative slope after the gap. 

If the signal from the camshaft Hall sensor is at 0 V ("low") at this moment, the ME control unit processes this 
in order to detect ignition TDC. This, is used for actuating the ignition coils and the fuel injectors. The high 
voltage is distributed rotorlessly. Advantages of the rotorless high voltage distribution are: 

significantly reduced electromagnetic interference level (no naked sparks)  

no rotating parts  

reduction in noise  

reduced high voltage connections.  

1. Determine ignition angle according to input signals, actuate ignition coils and release ignition 

spark. 

The ME-SFI control unit essentially analyzes the following signals for determining the ignition angle:

Engine

Recognition of TDC position of 
cylinder

Ignition TDC

111

1 and 4

Cylinder 1

104, 112, 113, 119

1 and 6

Cylinder 1

120, 137

Right hand cylinder bank: 1 and 6

Cylinder 1

 

Left cylinder bank: 7 and 12

Cylinder 7

 

2001 Mercedes-Benz ML320 

1998-2005 ENGINE Electrical System - Engine - 163 Chassis

  

me 

 

 

 

 

 

 

 

 

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