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.


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J197_4F_43_____1_1204_21_Einbauort.htm
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Reading measured value block

 

Measured value block 001

Readout 01

Vacant

Readout 02

Voltage supply for actuators (tolerance band 8.5V to15.5V)

Readout 03

Vehicle speed (0 -255 km/h)

Readout 04

Various states

Bit 0 = Extreme level detected (warning lamp flashing)=1 / Extreme level not detected=0

Bit 1 =Distortion detected during driving=1 / Distortion not detected=0

Bit 2 = Vehicle tilt detected=1 / Vehicle tilt not detected=0

Bit 3 = Control requirement detected=1 / Control requirement not detected=0

Bit 4 Reserved

Bit 5 = Trailer towing detected=1 / Trailer towing not detected=0

Bit 6 =Starter term.50 active=1 / Starter term.50 not active=0

 

Measured value block 002

Readout 01

Door status (Door closed/door open/locked/implausible)

Readout 02

Tailgate (Tailgate open/tailgate closed/locked/implausible)

Readout 03

Voltage altitude sensor supply right (0 - 6.375 V)

Readout 04

Voltage altitude sensor supply left (0 - 6.375 V)

 

Measured value block 003

Readout 01

Accumulator pressure (0 -25.5 bar)

Readout 02

Current pressure sensor signal (0 -25.5 bar)

Readout 03

Pressure sensor supply voltage (0 -6.375 V)

Readout 04

Vacant

 

 

Measured value block 004

Readout 01

Height deviation from normal level front left (-127 -128 mm)

Readout 02

Height deviation from normal level front right (-127 -128 mm)

Readout 03

Height deviation from normal level rear left (-127 -128 mm)

Readout 04

Height deviation from normal level rear right (-127 -128 mm)

 

Measured value block 005

Readout 01

Vehicle height absolute front left (wheel centre to wing) (0 -535.5 mm)

Readout 02

Vehicle height absolute front right (wheel centre to wing) (0 -535.5 mm)

Readout 03

Vehicle height absolute rear left (wheel centre to wing) (0 -535.5 mm)

Readout 04

Vehicle height absolute rear right (wheel centre to wing) (0 -535.5 mm)

 

Measured value block 006

Readout 01

Calculated model compressor temperature (-50...-205 °C)

Readout 02

Measured compressor temperature (-50 - 205 °C)

Readout 03

Regulation from memory possible (Yes/No)

Readout 04

Compressor relay (relay on/ relay off)

 

Measured value block 007

Readout 01

Lowering solenoid (on/off)

Readout 02

Pressure accumulator valve (on/off)

Readout 03

Compressor relay (on/off)

Readout 04

Current pressure sensor signal (0 -25.5 bar)

 

Measured value block 008

Readout 01

Front left air spring valve (on/off)

Readout 02

Front right air spring valve (on/off)

Readout 03

Rear left air spring valve (on/off)

Readout 04

Rear right air spring valve (on/off)

 

Measured value block 009

Readout 01

Adaptive suspension states

1 = Sleep

10 = Not relevant

11 = Not relevant

20 = Standing 1-mode

21 = Standing 1, engine off, door open

22 = Standing 1, engine off, door closed

30 = Standing 2-mode

31 = Standing 2, engine running, door open

32 = Standing 2, engine running, door closed

33 = Stop mode

40 = Driving mode

44 = Driving at dynamic level

45 = Driving in motorway mode

55 = Driving at automatic level

88 = Driving at raised level

100 = Driving, no regulation

111 = Jack

Readout 02

Damper emergency running definition

Bit 0 =Brake module deactivated

Bit 1 =Damper control with fixed current

Bit 2 =Dampers passive

Readout 03

Adaptive suspension states

Bit 0 = Extreme level detected (warning lamp flashing)=1 / Extreme level not detected=0

Bit 1 =Distortion detected during driving=1 / Distortion not detected=0

Bit 2 = Vehicle tilt detected=1 / Vehicle tilt not detected=0

Bit 3 = Control requirement detected=1 / Control requirement not detected=0

Bit 4 = Reserved

Bit 5 = Trailer towing detected=1 / Trailer towing not detected=0

Bit 6 =Starter term.50 active=1 / Starter term.50 not active=0

Readout 04

Vacant

 

Measured value block 010

Readout 01

Emergency running definition 1 level

Bit 0 = No adaptive suspension

Bit 1 = Compressor not switched on, raising only possible with adequate accumulator pressure

Bit 2 = Deactivate accumulator function

Bit 3 = Deactivate accumulator function and load measurement

Bit 4 = Compressor running monitored with temperature model

Bit 5 = Axle-wise mean value calculation with sensors on right side, only normal level is adjusted

Bit 6 = Axle-wise mean value calculation with sensors on left side, only normal level is adjusted

Bit 7 = Mean value regulation of front axle with sensor front right

Readout 02

Emergency running definition 2 level

Bit 0 = Mean value regulation of front axle with sensor front left

Bit 1 = Mean value regulation of rear axle with sensor rear right

Bit 2 = Mean value regulation of rear axle with sensor rear left

Bit 3 = Regulation with open doors

Bit 4 = No speed-dependent levelling, high level cannot be selected

Bit 5 = No vehicle lowering possible

Bit 6 = Adaptive suspension when towing

Bit 7 = Adaptive suspension uncalibrated

Readout 03

Bit 0 = Use of CAN "vehicle speed" information as substitute for "engine running"

Bit 1 = Normal levelling with slow filter and compressor with engine on

Bit 2 = Normal levelling with slow filter and compressor with ignition on

Bit 3 = Response to ESP fault

Bit 4 = Low to normal level, then block high level and disable regulation while driving

Bit 5 = Adaptive suspension switchover standing/driving only by way of vehicle speed

Bit 6 = ESP forced activation

Bit 7 = Lower to normal level and then deactivate regulation

Readout 04

Vacant

 

Measured value block 011

Readout 01

Height deviation from default front left (-127 -128 mm)

Readout 02

Height deviation from default front right (-127 -128 mm)

Readout 03

Height deviation from default rear left (-127 -128 mm)

Readout 04

Height deviation from default rear right (-127 -128 mm)

 

Measured value block 012

Readout 01

Signal body acceleration front left (0 - 5.1 V)

Readout 02

Signal body acceleration front right (0 - 5.1 V)

Readout 03

Signal body acceleration rear (0 - 5.1 V)

Readout 04

Supply voltage body acceleration sensors (0 - 16.575 V)

 

Measured value block 013

Readout 01

Damper valve current front left (0 - 2040 mA)

Readout 02

Damper valve current front right (0 - 2040 mA)

Readout 03

Damper valve current rear left (0 - 2040 mA)

Readout 04

Damper valve current rear right (0 - 2040 mA)

 

Measured value block 014

Readout 01

Damper valve current front left (0 - 2040 mA)

Readout 02

Pulse-width damper activation front left (0 - 99.6 %)

Readout 03

Damper valve current front right (0 - 2040 mA)

Readout 04

Pulse-width damper activation front right (0 - 99.6 %)

 

Measured value block 015

Readout 01

Damper valve current rear left (0 - 2040 mA)

Readout 02

Pulse-width damper activation rear left (0 - 99.6 %)

Readout 03

Damper valve current rear right (0 - 2040 mA)

Readout 04

Pulse-width damper activation rear right (0 - 99.6 %)

 

Measured value block 016

Readout 01

Status MMI operation 1

Bit 0 = Reserved

Bit 1 = Reserved

Bit 2 = Dynamic mode

Bit 3 = Automatic mode

Bit 4 = Lift mode

Bit 5 = Reserved

Bit 6 = Reserved

Bit 7 = Reserved

Readout 02

Status MMI operation 2

Bit 0 = Raise_vehicle

Bit 1 = Lower_vehicle

Bit 2 = Towing

Bit 3 = Jack mode

Bit 4 = Reserved

Bit 5 = Comfort mode

Readout 03

Status low-level lamp activation (on/off/flashing)

Readout 04

Status warning lamp activation (on/off/flashing)

 

Measured value block 017

Readout 01

Current damper detection specification (Comfortable / Normal / Sport1 / Sport2)

Readout 02

Default position specification (Low / Normal / High)

Readout 03

Low level default position

0 = No low level

1 = Low level 1

2 = Low level 2/motorway lowering

Readout 04

Vacant

 

Measured value block 019

Readout 01

Calculated model compressor temperature (-80...-300°C)

Readout 02

Compressor relay (relay on/ relay off)

Readout 03

Compressor activation

Bit 0 = Compressor running

Bit 1 = Raise with compressor permitted

Bit 2 = Accumulator charging permitted

Bit 3 = Engine running or substitute value for running engine

Bit 4 = Compressor activation speed exceeded

Bit 5 = Compressor activation required due to infringement of minimum activation height

Bit 6 = No deactivation response (e.g. starting) preventing switch-on of compressor

Bit 7 = Compressor running locked by overheating or EP monitoring and vehicle raising by compressor requested

Readout 04

Vacant

 

Measured value block 20

Readout 01

Controller states

Bit 0 = Transport mode

Bit 1 = Loading mode

Bit 2 = Jack mode

Bit 3 = Control off

Bit 4 = Default position not learned

Readout 02

Trailer towing

Bit 0 = Towing

Readout 03

Vacant

Readout 04

Vacant

 

Measured value block 21

Readout 01

ABS regulation

0 = No ABS regulation

1 = ABS regulation

255 = SNA (Signal not available)

Readout 02

ESP cut-in

0 = No ESP activation

1 = ESP activation

255 = SNA (Signal not available)

Readout 03

ESP system activation

0 = OK

1 = Error

255 = SNA (Signal not available)

Readout 04

Brake pressure

457.2 = Error

459.0 = SNA (Signal not available)

 

Measured value block 22

Readout 01

Standstill

0 = No standstill detected

1 = Standstill detected

255 = SNA (Signal not available)

Readout 02

Shut-off stages (0 - 6)

0 = Stage 0

1 = Stage 1

2 = Stage 2

3 = Stage 3

4 = Stage 4 (transport mode)

5 = Stage 5 (pre-warning to shut-off 2 for MMI)

6 = Stage 6

Readout 03

Not relevant

Readout 04

Trailer

Bit 0 = Trailer detected

Bit 1 = Trailer message outdated, currently received

Bit 2 = SNA (Signal not available)

 

Measured value block 23

Readout 01

Steering angle velocity  (-1435.1 - 1435.1 °/s)

Readout 02

Engine speed (0 - 13005 rpm)

Readout 03

Terminal 15 (0/1)

0 = Ignition off

1 = Ignition on

255 = SNA (Signal not available)

Readout 04

Terminal X (0/1)

0 = Basic state off

1 = Terminal X active

255 = SNA (Signal not available)

 

Measured value block 24

Readout 01

Unlearn counter

Readout 02

km reading

Readout 03

Year

Readout 04

Month

 

Measured value block 25

Readout 01

Day

Readout 02

Hour

Readout 03

Minute

Readout 04

Second

 

Measured value block 125

Readout 01

CAN message engine control unit

Readout 02

CAN message brake control unit

Readout 03

CAN message steering angle sender

Readout 04

CAN message elec. ignition lock

If a 1 is displayed, a CAN message is sent from the relevant control unit. If the tester shows a 0, the CAN message is interrupted. In such cases read the fault memory of the relevant control unit.

 

Measured value block 126

Readout 01

CAN message from BEM

Readout 02

CAN message from Gateway

Readout 03

CAN message from drive authorisation system

Readout 04

Vacant

If a 1 is displayed, a CAN message is sent from the relevant control unit. If the tester shows a 0, the CAN message is interrupted. In such cases read the fault memory of the relevant control unit.

 

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November 30, 2012
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