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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Reading measured value block.

 

Measured value block 001:  

J Voltage term.15 in Volts

J Voltage term.30 in Volts

J Vehicle speed in km/h

J Term. 50 on or term.50 off (starting; starter active)

Measured value block 002:

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

J Tailgate open/tailgate closed (tailgate status)

J Voltage supply right (4.8755.125 Volts)

J Voltage supply left (4.8755.125 Volts)

Measured value block 003:

J Calculated vehicle longitudinal acceleration  -20m/s2......20m/s2

JCalculated vehicle lateral acceleration m/s2   0,00981m/s2.....per increment

J Vacant

J Compressor relay (relay on/ relay off)

Measured value block 004:

J Deviation from standard level FL or 'default position not learned' (height deviation front left from standard level in mm)

J Deviation from standard level FR or 'default position not learned' (height deviation front right from standard level in mm)

J Deviation from standard level RL or 'default position not learned' (height deviation rear left from standard level in mm)

J Deviation from standard level RR or 'default position not learned' (height deviation rear right from

standard level in mm)

Measured value block 005:

J Vehicle height absolute FL

J Vehicle height absolute FR

J Vehicle height absolute RL

J Vehicle height absolute RR

Measured value block 006:

J Compressor temperature in °C

J Pressure sensor signal in bar

J Drain valve (status drain solenoid valve) "on / off"

J Pressure accumulator valve (status pressure accumulator valve) "on / off"

Measured value block 007:

J Air spring valve FL - switching status "on / off"

J Air spring valve FR - switching status "on / off"

J Air spring valve RL - switching status "on / off"

J Air spring valve RR - switching status "on / off"

  Measured value block 008:

JNot relevant to service

JNot relevant to service

JNot relevant to service

JNot relevant to service

Measured value block 009:

JNot relevant to service

JNot relevant to service

JNot relevant to service

JNot relevant to service

Measured value block 010:

J Vehicle level deviation FL in mm

J Vehicle level deviation FR in mm

J Vehicle level deviation RL in mm

J Vehicle level deviation RR in mm

Measured value block 011:

J Damper valve current FL in mA (0 - 2050A)

J Damper valve current FR in mA (0 - 2050A)

J Damper valve current RL in mA (0 - 2050A)

J Damper valve current RR in mA (0 - 2050A)

Measured value block 012:

J Signal body acceleration front left (specification 2.3-2.6 Volts)

J Signal body acceleration front right (specification 2.3-2.6 Volts)

J Signal body acceleration rear (specification 2.3-2.6 Volts)

J Steering angle +/- 720 ° (pos. SW left / neg. SW right)

Measured value block 013:

JDamper velocity front left

JDamper velocity front right

J Damper velocity rear left

J Damper velocity rear right

Measured value block 014:

J Current damper detection comfort=0 automatic=1  dynamic=2

JCDC emergency running (CD emergency running from A.....F,  0: no emergency running)

J Restriction of I-Soft by brake module.

 - 0% No effect on soft characteristic by braking.

 -100% braking fully affecting limitation of soft characteristic

J Restriction of I-Soft by acceleration module.

 - 0% No effect on soft characteristic by longitudinal acceleration.

 -100% Longitudinal acceleration fully affecting limitation of soft characteristic.

Measured value block 015:

JNot relevant to service

JNot relevant to service

JNot relevant to service

JNot relevant to service

Measured value block 120:

JCAN: Number of timeouts of brake control unit.

JCAN: Number of timeouts of engine control unit.

JCAN: Number of timeouts of steering angle control unit.

JCAN: Number of timeouts of electronic ignition lock.

Measured value block 121:

JCAN: Number of timeouts of gateway control unit (GWK1).

J Not used.

J Not used.

J Not used.

Measured value block 125:

JCAN message brake control unit (ABS 0/1)

JCAN message engine control unit (Engine 0/1)

JCAN message steering angle sender (Steering angle 0/1)

JCAN message electronic ignition lock (Combi 0/1)

Measured value block 126:

JCAN: Number of timeouts of gateway control unit (GWK1).

J Not used.

J Not used.

J Not used.

Possible readouts: 1 or 0; if "1" OK; if "0" n.OK

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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