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.


J197_4E_43_____1_0402_21_Messwerteblock_anzeigen.htm
J197_4E_43_____1_0402_21_Stellglieddiagnose.htm
J197_4E_43_____1_0603_21_Verlademodus.htm
J197_4E_43_____1_0702_21.htm
J197_4E_43_____1_0702_21_KDI.htm
J197_4E_43_____1_0902_21_Einbauort.htm

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 (0-10 Volts)

J Voltage supply left (0-10 Volts)

Measured value block 003:

J Pressed/unpressed (higher level selected)

J Vacant

J Pressed/unpressed (lower level selected)

J Relay on/relay off (compressor run status)

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:

JNot relevant to service

JNot relevant to service

JNot relevant to service

JNot relevant to service

Measured value block 006:

J Compressor temperature in °C

J Pressure sensor signal in bar

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

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

Measured value block 007:

J Transverse lock-up FL on/off (front left air spring valve status)

J Transverse lock-up FR on/off (front right air spring valve status)

J Transverse lock-up RL on/off (rear left air spring valve status)

J Transverse lock-up RR on/off (rear right air spring valve status)

  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

J Damper valve current FR in mA

J Damper valve current RL in mA

J Damper valve current RR in mA

Measured value block 012:

JSignal body acceleration front left in Volts (specification 2.4-2.6 Volts)

JSignal body acceleration front right in Volts (specification 2.4-2.6 Volts)

JSignal body acceleration rear in Volts (specification 2.4-2.6 Volts)

J Vacant

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:

JNot relevant to service

JNot relevant to service

JNot relevant to service

JNot relevant to service

Measured value block 015:

J Steering angle in degrees

J Vehicle speed in km/h

J Weighted braking signal in %

JCDC emergency running ( 32=CDC emergency running A; 16=CDC emergency running B; 8=CDC emergency running C; 4=CDC emergency running D;

  2=CDC emergency running E; 1=no emergency running

Measured value block 125:

J CAN message brake control unit

J CAN message engine control unit

J CAN message steering angle sender

JCAN message elec. ignition lock

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.

Measured value block 126:

JCAN message from Gateway

J Vacant

J Vacant

J Vacant

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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