gf0761p2003f

ME-SFI starting function

Type gf · topic 07.61 · version 0123 · 2008-04-04

Applies to: ENGINE 104.941 /943 /944 /991 /994 as of 1.8.96 ENGINE 104.995 with CODE (494) USA version with CODE (807) Model year 1997 with CODE (808) Model year 1998 with CODE (498) as of Model Year 97 Japan 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 (494) USA version with CODE (807) Model year 1997 with CODE (808) Mo

Where it sits

Function group 1 Engine › 07 Mixture formation › 07.61 ME fuel injection/ ignition system — Series 202 (models 020, 080) · Series 208 (models 335, 435)

Also applies to engines/gearboxes: 104 941, 104 943, 104 944, 104 991, 104 994, 104 995, 111 921, 111 942, 111 943, 111 944, 111 945, 111 946, 111 947, 111 973, 111 974, 111 975, 112 910, 112 911, 112 912, 112 913, 112 914, 112 916, 112 917, 112 920, 112 921, 112 922, 112 923, 112 940, 112 941, 112 942, 112 943, 112 944, 112 946, 112 947, 112 949, 112 953, 112 954, 112 955, 112 970, 112 972, 112 973, 112 975, 113 940, 113 941, 113 942, 113 943, 113 948, 113 960, 113 961, 113 963, 113 965, 113 966, 113 967, 113 968, 113 969, 119 980, 119 981, 119 982, 119 985, 120 982, 120 983, 137 970

GF07.61-P-2003F

ME-SFI starting function

10.7.96

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

ENGINE 104.995
with CODE (494) USA version
with CODE (807) Model year 1997
with CODE (808) Model year 1998
with CODE (498) as of Model Year 97 Japan 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 (494) USA version
with CODE (807) Model year 1997
with CODE (808) Model year 1998

ENGINE 112.910 /911 /912 /913 /914 /917 /920 /921 /922 /923 /940 /941 /942 /943 /944 /947 /949 /954 /955 /970 /972 /975, 113.940 /941 /942 /943 /948 /960 /961 /965 /966 /967 /968 /969, 119.980 /981 /982 /985, 120.982 /983, 137.970

ENGINE 112.916 /946 /953 /973, 113.963 up to Model Year 8

Start quantity control
Fuel has to be injected additionally during the start operation, in line with the coolant temperature, in order to facilitate starting of a cold engine. The increased quantity of fuel injected is achieved by extending the injection time.

Battery voltage and voltage supply
The injected fuel quantity is determined by the opening times of the fuel injectors. This opening time is dependent on the battery voltage. The ME control unit extends the injection time in order to compensate the quantity injected if, for example, the battery voltage is low. No further engine start is possible below approx. 7 V.

Post-start enrichment

After the engine is started from cold enrichment with additional fuel is necessary for a short time. The fuel which precipitates on the cylinder walls, is compensated for by this enrichment, and the engine runs smoothly.

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Synchronization of fuel injection and firing order

In order to achieve correct synchronization of the fuel injection and firing order to the particular cylinder, the order is synchronized during the first revolutions of the engine. The ME-SFI control unit requires the signals from the camshaft Hall sensor and crankshaft position sensor for this purpose.

Ignition at engine start

When the engine is started and up to approx. 500 rpm, the ignition timing point is controlled only on the basis of the signals supplied by the camshaft Hall sensor. Only once the engine speed has reached approx. 600 rpm is a transition made from the fixed ignition timing point to the ignition timing point calculated in line with the momentary operating state.

Starter control

The solenoid switch of the starter (circuit 50) is actuated through the starter relay by the engine control unit.

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Parking shift lock

On automatic transmission the engine can only be started in selector lever position "P/N" and when the service brake is operated. The information "selector lever P/N" comes via CAN from the AT control unit (N15/3). The information "service brake operated " comes via CAN from ESP control unit (N47-5).

The drive authorization system inhibits the engine management system. Although the starter rotates, the engine does not start.

Electronic ignition switch control unit, location/task/design/function

Model 202 as of 6/97, 208, 210 as of 3/97, 210.08 /281

GF80.57-P-4102A

Model 215, 220

GF80.57-P-4102S

Model 203, 209

GF80.57-P-4102PP

ME fuel supply function

Engine 104, 111, 119, 120

in Model 129, 140, 170, 202, 208, 210

GF07.61-P-3004F

Engine 112, 113, 137
(except in Model 203, 209, 211)

GF07.61-P-3004A

Engine 112.91/94/95 203

Engine 112.91/94/95, 113.96 in Model 211

Engine 112.912/955, 113.968 in Model 209

GF07.61-P-3004P

ME-SFI ignition system function

GF15.12-P-0001F

ECI ignition system function

Engine 137

GF15.15-P-3000L

ME-SFI start quantity control function

GF07.61-P-3010F

ME-SFI synchronizing fuel injection and firing order function

GF07.61-P-4009F

Starter control, function

with MT

GF15.30-P-3000G

with automatic transmission

Engine 111 (except HFM sequential multiport fuel injection/ignition system and M111EVO), 112, 113, 120.983 as of 6/98, 137, 166 up to 8/01, 166 with ACS up to 8/01

GF15.30-P-3000GA

ETC control unit, location/task

Transmits the information selector lever position P/N via CAN.

Transmission 722.6

GF27.19-P-4012G

Referenced documents