VCDS HVAC Block reading.pdf

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Measured Value Block, Reading
Page 1 of 23
Audi > A8/A8L > 2004-2008
Heating Air Conditioning
01 - Diagnosis and Testing
.
Measured Value Block, Reading
Climatronic Control Module, Measured Value Block, Reading
Display Group Numbers 001, 001 to 019
Display Group Numbers 001, 020 to 039
Display Group Numbers 001, 040 to 050
Climatronic Control Module, Display Groups Front, Not Currently Intended for
Service Use
Rear A/C Control Head, Climatronic, Measured Value Block, Reading
Display Group Numbers 001 to 007, 008
Note:
This Workshop Manual lists the various measured value blocks for information
purposes only. Perform the function "Read measuring value block" in Guided Fault
Finding, here is also found a clarification of the corresponding measured values and
notes on the function of various components. Vehicle Diagnosis, Testing and
Information System VAS 5051 in "Guided Fault Finding" function.
Component locations of activated components
A/C Control Components Outside
Passenger Compartment
and
A/C Control Components Inside Passenger
Compartment
.
Depending on the position of the actuator, the various flaps are closed and opened
over the adjustment range of the actuator via the installed cam disk. Vehicle
Diagnosis, Testing and Information System VAS 5051 in "Guided Fault Finding"
function.
If a value greater than "250" (open circuit or fault in Ground (GND) connection) or less
than "5" (open circuit, fault in 5 V voltage supply or short circuit to GND connection) is
displayed for one (or more) potentiometer(s) in one (or more) control motor(s), this
indicates a malfunction in wire connection to control motor or in potentiometer of the or
a control motor (same B+ supply or GND connection).
If displayed value of actuator is outside permitted range, check allocation of levers and
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Measured Value Block, Reading
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cam disks which connect actuator shaft to flap(s)
Heating and A/C Unit
.
If no permissible value can be determined for a potentiometer in a control motor during
the function "Basic Setting" , display group corresponding to this control module
displays a substitute value and stores a DTC in DTC memory. By using this substitute
value (approx. average value in permissible tolerance range), the front Climatronic
Control Module J255 (or Rear A/C Control Head (Climatronic) E265 ) controls the flap
position when in emergency running mode.
Depending on version of Climatronic Control Module J255 and Rear A/C Control Head
(Climatronic) E265 , "On" or "1" and "Off" or "0" may be displayed in measuring value
block.
.
Climatronic Control Module, Measured Value Block, Reading
With ignition switched off, connect diagnostic operation system VAS 5051 A with
diagnostic cable VAS 5051/5A to 16-pin Data Link Connector (DLC) in vehicle
Vehicle Diagnostic, Testing and Information System VAS 5051 A , connecting and
selecting functions
.
Switch on ignition or start engine.
Set operating mode "Auto" on , Climatronic Control Module J255 .
Select Address word "08" for A/C heater/electronics
Vehicle Diagnostic, Testing and
Information System VAS 5051 A , connecting and selecting functions
.
Indication on display of diagnostic operation system VAS 5051 A :
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Measured Value Block, Reading
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Check DTC memory
DTC Memory, Checking
.
Select function "08 - Read Measuring Value Block" .
Indication on display of diagnostic operation system VAS 5051 A :
Display field -
1
- indicates request to input display group.
Display field -
2
- shows input keyboard.
Enter the desired display group (e.g. "01" or "001" display group number "001" ) via the
input keyboard in display field -
2
- , and confirm by pressing the Q button.
List of available display group numbers:
Display group "001" to "019"
Display group "020" to "039"
Display group "040" to "050"
Display Group Numbers 001, 001 to 019
Display Group Numbers 001, 020 to 039
Display Group Numbers 001, 040 to 050
Indication on display of diagnostic operation system VAS 5051 A :
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Measured Value Block, Reading
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Display field -
1
- shows the display group selected.
Display field -
2
- displays the values of the four display fields:
Value for display field "1" is displayed in the first row.
Values for respective display zones appear on second, third and fourth lines.
If no display appears in this row, a display field is not assigned.
Pressing button -
3
- changes to a different display group.
Press button -
4
- to change to a different function (e.g. from "Read Measuring Value
Block" to "Basic Setting" and back again).
Enter desired display group number.
.
Display Group Numbers 001, 001 to 019
Display Display
Designation
group
zone
number
001
1
Control current to activate A/C Compressor Regulator Valve
N280 in amps. Current flowing via A/C Compressor
Regulator Valve N280 Display = less than 0.050 A
Compressor shut off Display = 0.300 A to 0.650 A (0.850 A)
Compressor in control mode; control current is governed by
cooling output required Maximum control current is
dependent on version of Climatronic Control Module J255
2
Activation of A/C Compressor Regulator Valve N280 in %
Duty cycle of actuation signal Display = 0% Compressor
shut off Display = 30....40% to 100% Compressor in
regulated mode If compressor is activated even with A/C
switched off (display = 0%, A/C provides cooling), check
both connectors for interchange (to electric engine mount
and to A/C compressor regulator valve N280 ).
Note:
Display Display
Designation
group
zone
number
001
3
Signal of High Pressure Sensor G65 in % Duty cycle as a
function of pressure in refrigerant circuit Display = 0....5% or
90....100% No or faulty signal from High Pressure Sensor
G65 Display = 5% to 12 % or 87.5 to 90% Pressure in
refrigerant circuit too low (system empty) or too high Display
= 12 % to 87.5% Pressure in refrigerant circuit in
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Measured Value Block, Reading
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If a
compressor
4
switch-off
condition
exists for
the
compressor
( display
group
002) the A/C Compressor Regulator Valve N280 cannot be activated, nor during
output Diagnostic Test Mode (DTM) (
Output Diagnostic Test Mode
).
permissible range
Pressure in refrigerant circuit in bar Calculated by
Climatronic Control Module J255 via duty cycle of signal
from High Pressure Sensor G65 Display = less than 2.6 bar
or greater than 29 bar (even briefly) Pressure in refrigerant
circuit too low (system empty) or too high High Pressure
Sensor G65 malfunctioning Display = 2.6 bar to 29 bar
Pressure in refrigerant circuit in permissible range
If no pressure signal is detected by High Pressure Sensor G65 , A/C Compressor
Regulator Valve N280 must not be activated.
Climatronic Control Module J255 calculates pressure in refrigerant circuit via duty
cycle (display field 3).
If refrigerant circuit has been correctly filled, pressure will be 2.6 bar at a temperature
of -3 C degree . To avoid malfunction entries at low temperatures, Climatronic Control
Module J255 recognizes a malfunction in the refrigerant circuit first at pressure less
than 1.8 bar (attained at -12 C degree ). However, at this temperature the High
Pressure Sensor G65 is no longer checked.
Permissible specified values are found in the table which is located in the "Guided
Fault Finding" function. Vehicle Diagnosis, Testing and Information System VAS
5051 in "Guided Fault Finding" function.
Display
group
number
002
Display
zone
1
Designation
Note:
2
3
4
Currently valid compressor shutoff criterion
Explanatory notes
Explanatory notes for compressor
shut-off conditions in display group
Last compressor shutoff criterion Explanatory notes
Explanatory notes for compressor shut-off conditions in
display group
Last but one compressor shutoff criterion Explanatory
notes
Explanatory notes for compressor shut-off
conditions in display group
Third last compressor shutoff criterion Explanatory
notes
Explanatory notes for compressor shut-off
conditions in display group
Further notes for designated compressor shut-off conditions are found in the table
which is located in the "Guided Fault Finding" function. Vehicle Diagnosis, Testing
and Information System VAS 5051 in "Guided Fault Finding" function.
.
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