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Suction Fan

The document outlines the fan control function for engines 112.942 and 113.942, detailing how the ME-SFI control unit regulates the electric suction fan's speed through a pulse width modulated signal. It specifies the operational parameters for fan speed and the implications of faulty actuation, which results in maximum fan speed. Additionally, it mentions the requirement for a CAN capable instrument cluster and the necessary programming for air conditioning systems.

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Fabiano B. Silva
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16 views2 pages

Suction Fan

The document outlines the fan control function for engines 112.942 and 113.942, detailing how the ME-SFI control unit regulates the electric suction fan's speed through a pulse width modulated signal. It specifies the operational parameters for fan speed and the implications of faulty actuation, which results in maximum fan speed. Additionally, it mentions the requirement for a CAN capable instrument cluster and the necessary programming for air conditioning systems.

Uploaded by

Fabiano B. Silva
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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GF07.

61-P-3023G Page 1 of 2

GF07.61-P-3023G Fan control function 10.7.96

ENGINE 112.942 /970


ENGINE 113.942 /965

Shown on Engine 111


A1 Instrument cluster
A9 AC compressor
B11/4 Coolant temperature sensor
L5 Crankshaft position sensor
M4/3 Electric suction fan engine/ A/C
N3/10 ME-SFI control unit
N19 AC control and operating unit
N22 Automatic air conditioning (KLA)
control and operating unit
N76 Engine/AC electric suction fan
control unit
(further designation N65/2)
CAN Data bus

P07.61-0385-06

The ME-SFI control unit indirectly actuates the fan through the engine/AC electric suction fan control unit.
The fan specified speed is transmitted by the ME control unit to the engine/AC electric suction fan control unit by means of a pulse
width modulated signal. The on/off ratio is 10 to 90%, in which the following means e.g.:
10% electric suction fan OFF
20% electric suction fan ON, minimum speed
90% electric suction fan ON, maximum speed

© 2006 Mercedes-Benz USA, LLC


GF07.61-P-3023G Page 2 of 2

If the actuation is faulty, the electric suction fan rotates with maximum rotational speed.

The status of the air conditioning or automatic air conditioning is transmitted from the instrument cluster via the CAN to the ME
control unit. The fan specified speed is dependent on this status.

CAN capable instrument cluster required, that the HHT or STAR DIAGNOSIS is programmed according to with/without air
conditioning or automatic air conditioning.

Engine 112 at production start-up as of 3/97 with viscous fan clutch, fan control phased in as of 7/97.

Motor electronics control unit, location/task/design/function GF07.61-P-5000F


Coolant temperature sensor, location/task/design/function Engine 112, 113 GF07.04-P-5026A

© 2006 Mercedes-Benz USA, LLC

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