ECU - Electronic Control Unit

In terminology of VW-group it's any electronic device, which has been carried out some logic function. Sometimes it looks like nonsens - even simple relay can be called ECU.

The coding of Electronic Control Unit used for explain the ECU where it is and what "neighbours" does it have. Very often on modern cars the coding is crossed with adaptation.

Adaptation of the Electronic Control Unit serves to explain to the ECU with whom and how to talk (If we have started to speak allegories) and serves as storehouse of various adjustable parameters. ( part of memory in the Control Unit which can be changed via internal software )

Measured Values Blocks ( MWB ) – various parameters being inbound or calculated. Considering to value of MWB Electronic Control Unit, trying to "control"... Using of MWB allows you ( if you know the basic parameters ) to find out "close to boundary" or temporarily arising ( intermittent, sporadic ) malfunctions and many other useful things at competent use.


J126_4F_87_____1_0204_21_Funktion.htm
J179_4F_28_BMK_1_0304_21_Messaufbau.htm
J179_4F_28_BMK_1_0304_21_Signal.htm
J179_4F_28_BMK_2_0304_21_Messaufbau.htm
J179_4F_28_BMK_2_0304_21_Signal.htm
J17__4F_20_BAT_1_1103_21.htm
J17__4F_20_BDW_1_1103_21.htm
J245_4F_60_____1_0104_21_Allg_Beschreibung.htm
J245_4F_60_____1_1103_21_Allg_Beschreibung.htm
J245_4F_60_____2_0104_21_Allg_Beschreibung.htm
J250_4F_40_____1_1207_21_DRC.htm
J250_4F_40_____1_1207_21_Kombi_RS6.htm
J250_4F_40_____1_1207_21_MMI_RS6.htm
J250_4F_43_____1_1207_21_Zentralventile_RS6.htm
J271_4F_20_BAT_1_1103_21.htm
J271_4F_20_BDW_1_1103_21.htm
J271_4F_20_BDX_1_0807_21.htm
J271_4F_24_AUK_1_0605_21.htm
J293_4F_19_AUK_1_0104_21.htm
J293_4F_19_BDX_1_0207_21.htm
J293_4F_19_BGS_1_0206_21.htm
J293_4F_19_BLB_1_0704_21.htm
J293_4F_19_BUH_1_0108_21.htm
J329_4F_97_____1_1103_21_Relais_Spannung_KL_15.htm
J329_4F_97_____2_1103_21_Relais_Spannung_KL_15.htm
J338_4F_24_BDW_1_0204_21.htm
J338_4F_24_BDX_1_0207_21.htm
J338_4F_24_BUH_1_1207_21.htm
J53_4F_97_____1_1103_21_Relais_fuer_Anlasser.htm
J53_4F_97_____2_1103_21_Relais_fuer_Anlasser.htm
J601_4F_96_____1_0204_21.htm
J694_4F_97_____1_1103_21_Relais_Spannung_KL_75X.htm
J694_4F_97_____2_1103_21_Relais_Spannung_KL_75X.htm
J728_4F_91_____1_0704_21_Einbauort.htm
J844_4F_96_____1_0608_21_Anpassung.htm

Fresh air blower control unit - J126

 

A - Connector to fresh air blower -V2

B - Connector to fresh air blower control unit -J126

C - Fixing bolts

D - Fresh air blower control unit - J126

 

The fresh air blower control unit -J126 is located immediately next to the fresh air blower -V2 and is accessible via the cover in the plenum chamber.

It controls the blower -V2 and the communication with the Climatronic control unit -J255.

 

Measured value block 044

 

Display zone 1

 

Actual current flowing via fresh air blower -V2

- The value for the current flowing via the fresh air blower -V2 is regulated by the

fresh air blower control unit -J126 and transmitted via the data bus system of the air conditioner "Lin bus" to the

Climatronic control unit -J255.

J Readout = "0...XX A" (Amperes)

- The current is regulated steplessly from 0 to around 25 A.

 

Display zone 2

 

Operating hours in which the fresh air blower -V2 was operated by way of the sun roof with solar cells.

- Only relevant in vehicles with a sun roof with solar cells (optional extra)

- The value for the operating hours is calculated by the

Climatronic control unit -J255 and transmitted by the fresh air blower control unit -J126 via the data bus system of the air conditioner "Lin bus".

J Readout = "0 h"(hours; readout on a vehicle without "sun roof with solar cells").

J Readout  "0...XXXXXh"(hours)

- The readout is dependent on the time for which the vehicle with this Climatronic control unit -J255 was exposed to the sun.

 

Display zone 3

 

Actual voltage at fresh air blower -V2

- The value for the voltage is measured by the fresh air blower control unit -J126 and transmitted via the data bus system of the air conditioner "Lin bus" to the Climatronic control unit -J255.

J Readout = "0 ... 12.5 V" (Volts)

- The voltage is regulated steplessly from 0 to around 12.5 V.

 

Display zone 4

 

Specified voltage at fresh air blower -V2

- The value for the voltage is calculated by the fresh air blower control unit -J126 and transmitted via

the data bus system of the air conditioner "Lin bus" to the

Climatronic control unit -J255.

J Readout = "0 ... 12.5 V" (Volts)

- The voltage is regulated steplessly from 0 to around 12.5 V.

 

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