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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Final control element test

 

Test step 1 Components involved: Short description of function

Air spring valve FL Air spring valve FL, drain valve, Open air spring valve & drain valve,

height sensor FL, pressure sensorpressure readout, height value as delta to

learned default position Lower to -20mm

below standard level

Test step 2

Air spring valve FL Air spring valve FR, drain valve, Open air spring valve & drain valve,

height sensor FR, pressure sensorpressure readout, height value as delta to

learned default position Lower to -20mm

below standard level

Test step 3

Air spring valve RL Air spring valve RL, drain valve, Open air spring valve & drain valve,

height sensor RL, pressure sensorpressure readout, height value as delta to

learned default position Lower to -20mm

below standard level

Test step 4

Air spring valve RR Air spring valve RR, drain valve, Open air spring valve & drain valve,

height sensor RR, pressure sensorpressure readout, height value as delta to

learned default position Lower to -20mm

below standard level

Test step 5 Compressor , drain valve,

Pressure accumulator test pressure sensor

 

6. Compressor test Compressor , drain valve Actuation of compressor relay, Open

drain valve

 

7. CDC valve FL CDC valve FL 2-stage current application to valves

Maximum current approx. 1.8 A

Minimum current approx. 0.05 A

 

8. CDC valve FR CDC valve FR 2-stage current application to valves

Maximum current approx. 1.8 A

Minimum current approx. 0.05 A

 

9. CDC valve RL CDC valve RL 2-stage current application to valves

Maximum current approx. 1.8 A

Minimum current approx. 0.05 A

 

10. CDC valve RR CDC valve RR 2-stage current application to valves

Maximum current approx. 1.8 A

Minimum current approx. 0.05 A

 

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November 30, 2012
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