gf0761p4028d

Intake air temperature correction function

Type gf · topic 07.61 · version 0104 · 2007-03-20

Applies to: ENGINE 104.941 up to 31.7.96, 104.995 except CODE (491) as of Model Year 97 U.S. version except CODE (498) as of Model Year 97 Japanese version ENGINE 104.942 /945 /992, 111.921 /942 /946 /960 /961 /970 /977 ENGINE 104.943 /944 /991 /994, 111.944 /975 up to 31.7.96 ENGINE 111.945 up to 31.7.96 in MODEL 202.020 /080 ENGINE 111.945 up to 31.5.98 in MODEL 208.335 ENGINE 111.974 except CODE (491) as of Model Year 97 U.S. version

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)

Also applies to engines/gearboxes: 104 941, 104 942, 104 943, 104 944, 104 945, 104 991, 104 992, 104 994, 104 995, 111 921, 111 942, 111 944, 111 945, 111 946, 111 960, 111 961, 111 970, 111 974, 111 975, 111 977

GF07.61-P-4028D

Intake air temperature correction function

26.9.96

ENGINE 104.941 up to 31.7.96,
104.995
except CODE (491) as of Model Year 97 U.S. version
except CODE (498) as of Model Year 97 Japanese version

ENGINE 104.942 /945 /992, 111.921 /942 /946 /960 /961 /970 /977

ENGINE 104.943 /944 /991 /994, 111.944 /975 up to 31.7.96

ENGINE 111.945 up to 31.7.96 in MODEL 202.020 /080

ENGINE 111.945 up to 31.5.98 in MODEL 208.335

ENGINE 111.974 except CODE (491) as of Model Year 97 U.S. version

15.03.07

The document has been updated to this date

and will no longer be subject to revision.

Intake air temperature correction function

P07.51-0496-06

Shown on engine 104

B2/5 Hot film mass air flow sensor

B11/3 Coolant temperature sensor

B17 Intake air temperature sensor

L5 Crankshaft position sensor

M16/6 Idle speed control (ISC) actuator

N3/4 Hot film engine management
(HFM-SFI) control module

T1/1 Twin-spark ignition coil 1, cylinders 2and 5 (HFM-SFI)

T1/2 Twin-spark ignition coil 2, cylinders 3and 4 (HFM-SFI)

T1/3 Twin-spark ignition coil 3, cylinders 1and 6 (HFM-SFI)

Task

Reducing the thermal stresses of the engine at high temperatures.

Design/function

The ignition timing point is "retarded" by the engine control module as a function of the intake air temperature and "load" (engine speed and air mass).

The ignition timing point is retarded only at a high load and commences from an intake air temperature of about +35 °C and reaches its maximum retardation at about +75 °C.

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Example at full throttle.

30 °C 0° CA

50 °C 3° CA later

75 °C 4° CA later

The following information is processed in the engine control module:

Intake air temperature

Engine speed/crankshaft position/ignition circuit recognition

Throttle valve position

Air mass

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Control module (HFM-SFI) position/task/design/function

GF07.51-P-4103D

Coolant temperature sensor position/task/design/function

(B11/3)

GF07.04-P-5026GA

(B11/4)

GF07.04-P-5026G

Intake air temperature sensor position/task/design/function

GF07.04-P-2100F

Crankshaft position sensor position/task/design/function

GF07.04-P-4116G

Hot film mass air flow sensor position/task/design/function

Round connector with bayonet lock

GF07.07-P-4118E

5-pin connection, integrated intake air temperature sensor

GF07.07-P-4118G

Synchronization of fuel injection firing order function

with incremental control

GF07.61-P-4009D

Synchronization of fuel injection firing order with segment control function

GF07.51-P-4009D

Referenced documents