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_4F_43_____1_0505_21_Codierung.htm
J197_4F_43_____1_0604_21_KDI.htm
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J197_4F_43_____1_0604_21_Verlademodus_C6.htm
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Final control diagnosis

The following components of the adaptive suspension control unit -J197 can be activated individually (selective control element test). Additionally in new Audi A6 2005 >, between 1 and max. 3 measured values of the displayed control elements are displayed for activation.

Control element test

 

1. Test step 4 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 sensor pressure readout, height value as delta to

learned default position Lower to -20mm

below standard level

 

 

2. Test step 4 Components involved: Short description of function

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

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

learned default position Lower to -20mm

below standard level

3. Test step 4 Components involved: Short description of function

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

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

learned default position Lower to -20mm

below standard level

 

4. Test step 4 Components involved: Short description of function

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

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

learned default position Lower to -20mm

below standard level

 

5. Test step 4 Components involved:

pressure accumulator test Compressor , drain valve,

Pressure sensor

6. Test step 4 Components involved: Short description of function

Compressor , drain valve Activation of compressor relay, Open

drain valve

 

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

Damper hard approx. 1.0 A

Damper soft approx. 0.3 A

 

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

Damper hard approx. 1.0 A

Damper soft approx. 0.3 A

 

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

Damper hard approx. 1.0 A

Damper soft approx. 0.3 A

 

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

Damper hard approx. 1.0 A

Damper soft approx. 0.3 A

 

 

Readouts in 1st test step > vehicle lowered at front left

1. Accumulator pressure in bar (0 to 20.4 Bar)

2. Deviation from standard level, front left (-127...+128mm)

 

Readouts in 2nd test step > vehicle lowered at front right

Pos.1. Accumulator pressure in bar (0 to 20.4 Bar)

Pos.2. Deviation from standard level, front right (-127...+128mm)

 

Readouts in 3rd test step > vehicle lowered at rear left

Pos.1. Accumulator pressure in bar (0 to 20.4 Bar)

Pos.2. Deviation from standard level, rear left (-127...+128mm)

 

Readouts in 4th test step > vehicle lowered at rear right

Pos.1. Accumulator pressure in bar (0 to 20.4 Bar)

Pos.2. Deviation from standard level, rear right (-127...+128mm)

 

Readouts in 5th test step > accumulator is tested

Pos.1. Accumulator pressure in bar (0 to 20.4 Bar)

Pos.2. Measured compressor temperature (-99...+155 C)

Pos.3. Compressor activation (max. 8-bit display)

 

Readouts in 6th test step > adaptive suspension compressor relay -J403

Pos.1. Pressure display, line system (0 to 20.4 bar)

Pos.2. Measured compressor temperature (-99...+155 C)

Pos.3. Compressor activation (max. 8-bit display)

 

Readouts in 7th test step > damping adjustment valve, front left -N336

Pos.1. Damper valve current, front left (0...2040 mA), damper response soft (=300mA) hard (=1.0A)

Pos.2. Time (0...300sec.)

Pos.3. Empty string or "inactive"

 

Readouts in 8th test step > damping adjustment valve, front right -N337

Pos.1. Damper valve current, front right (0...2040 mA), damper response soft (=300mA) hard (=1.0A)

Pos.2. Time (0...300sec.)

Pos.3. Empty string or "inactive"

 

Readouts in 9th test step > damping adjustment valve, rear left -N338

Pos.1. Damper valve current, rear left (0...2040 mA), damper response soft (=300mA) hard (=1.0A)

Pos.2. Time (0...300sec.)

Pos.3. Empty string or "inactive"

 

Readouts in 10th test step > damping adjustment valve, rear right -N339

Pos.1. Damper valve current, front left (0...2040 mA), damper response soft (=300mA) hard (=1.0A)

Pos.2. Time (0...300sec.)

Pos.3. Empty string or "inactive"

 

Readouts in 11th test step > front information control unit -J523

Pos.1. MMI readouts 1 (bit 0 = fault bit; bit 1= vacant; bit 2 = Dynamic mode; bit 3 = Automatic mode; bit 4 = Lift mode (1 means logically active otherwise 0)

 

Pos. 2 MMI readouts 2 (bit 0 = vehicle raised; bit 1 = vehicle lower; bit 2 = towing mode; bit 3 = jack mode; bit 4 = vacant; bit 5 = Comfort mode (1 means logically active otherwise 0)

 

END

 

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