Measuring Value Blocks (Function 08)
Read Measuring Value Block (Function 08)
NOTE:
- 10 measuring value blocks each containing 4 measured values are available.
When performing read measuring value block, function 08:
- Control of A/C system is possible (compressor runs, air distribution control is possible etc.)
- Readouts in display groups 02 to 05 show the actual measured values (servo motor potentiometer resistances) learned during the last basic setting.
- The position of air/temperature distribution flaps can be altered by manual control of the control head and corresponding flap positions can be determined by watching the display values change.
- Measured values in display must correspond to specified values.
Print-outs of measuring value block tables are available using the VAG1551 printer function.
Initiating read measuring value block
- Start engine.
- Set "AUTO" mode at A/C control head (compressor switched on).
- Run fresh air blower on high speed for about 1 minute (in order to adjust flap flap motors).
- Connect VAG1551, enter address word 08 "A/C Heating Electronics" and move forward in programme until "select function XX" appears in display.
Indicated on display
Rapid data transfer HELP
Select function XX
- Press buttons -0- and -8-.
Indicated on display
Rapid data transfer Q
08 - Read Measuring Value Block
- Press -Q- button to confirm input.
Indicated on display
Read Measuring Value Block
Input display group number XXX
- Enter desired display group number based on component or system to be checked.
- Press -Q- button to confirm input.
Indicated on display
Read Measuring Value Block X .
1 2 3 4
- Identify and confirm component function, measured value or operating condition of system/component using display field references from tables.
To select a different display group number:
- Press -C- button.
Indicated on display
Read Measuring Value Block
Input display group number XXX
- Enter next display group number and refer to applicable display field information.
If specified values are reached for desired display fields:
- Press -> button.
Indicated on display
Rapid data transfer HELP
Select function XX
Display group number table, 1996 >
Display group 01 (compressor cut-off conditions)
NOTE:
- When display field -1- shows compressor cut-off condition codes 1, 8, 11 or 12, the A/C Clutch -N25- cannot be actuated during Output Diagnostic Test Mode (DTM). [1][2]Output Diagnostic Test Mode (DTM) (Function 03) If compressor cut-off condition code 5 appears in addition to other compressor cut-off condition, ignore code 5.
- If several compressor cut-off condition codes exist at the same time (display field -1-), the cut-off conditions are either displayed alternately or only the cut-off condition which has been assigned the highest priority by A/C control head -E87- is displayed.
Display group 01 (voltage for A/C clutch and terminal 75x)
Display group 02 (Temperature Regulator Flap Motor -V68-)
Display group 03 (Central Flap Motor -V70-)
Display group 04 (Footwell/Defroster Flap Motor -V85-)
Display group 05 (Air Flow Flap Motor -V71-)
Display group 06 (calculated outside temperature for Outside Air Temperature Display -G106-, measured values of Fresh Air Intake Duct Temperature Sensor - G89- and Outside Air Temperature Sensor -G17-)
Display group 07: (Sunlight Photo Sensor -G107-, Instrument Panel Interior Temperature Sensor -G56- and measured or calculated coolant temperature)
Display group 08 (voltage at Fresh Air Blower -V2-, voltage at terminals 58 and 58D)
Display group 09 (engine speed, compressor speed, vehicle speed and auxiliary heater)
Display group 10: (A/C Kickdown Switch -F46-, engine temperature switch in Mini Check System Control Module -J268-, A/C compressor intervention and A/C High Pressure Switch -F118-)
Display group number table, 1997 >
Display group 01 (compressor cut-off conditions)
NOTE:
- When display field 1 shows compressor cut-off condition codes 1, 8, 11 or 12, the A/C Clutch -N25- cannot be actuated during Output DTM. [1][2]Output Diagnostic Test Mode (DTM) (Function 03) If compressor cutoff condition code 5 appears in addition to other compressor cut-off conditions, ignore code 5.
- If several compressor cut-off condition codes appear simultaneously in display field 1, conditions are displayed alternately or the cut-off condition assigned the highest priority by A/C control head -E87- is displayed.
- With A/C pressure switch -F129- open, compressor cut-off condition "1" appears next (excess refrigerant system pressure) and the compressor is shut off. If A/C pressure switch -F129- remains open for more than 30 seconds, it switches over to compressor cut-off condition "3" (empty refrigerant system, vacuum).
Display group 02 (Temperature Regulator Flap Motor -V68-)
Display group 03 (Central Flap Motor -V70-)
Display group 04 (Footwell/Defroster Flap Motor -V85-)
Display group 05 (Air Flow Flap Motor -V71-)
Display group 06 (calculated outside temperature for Outside Air Temperature Display -G106-, measured values of Fresh Air Intake Duct Temperature Sensor - G89-, Outside Air Temperature Sensor -G17- and Sunlight Photo Sensor -G107-)
Display group 07: (measured value of sensors for Outlet Temperature -G191-, - G192- & Instrument Panel Interior Temperature Sensor -G56-)
Display group 08: (voltage at Fresh Air Blower -V2-, parking light and illumination voltage at terminals 58 and 58D)
Display group 09 (engine speed, vehicle speed and auxiliary heater)
Display group 10: (Engine Coolant Temperature Signal from Instrument Cluster - J268-, A/C compressor intervention and A/C high pressure switch F118)
Display group number table, changes affecting m.y. 1998 >
Note on display group 007 display field 3:
For the A/C control head -E87- with only one display, the instrument panel interior temperature sensor -G56- is installed in the A/C control head -E87-. -G56- cannot be checked or replaced individually, if malfunctioning replace -E87- completely.
Display group 001: Compressor cut-off conditions, voltage for A/C clutch drive, voltage at terminal "15", and signal for "ignition off" period
NOTE:
- Display group 1 indicates current compressor cut-off conditions.
- For vehicles with an A/C control head with one display and part number 8D0 820 043 after index "M" the last four compressor cut-off conditions that were effective for more than 20 seconds are indicated in display group 011.
Display group 007:
Note on display group 007 display field 3:
For the A/C control head -E87-, the instrument panel interior temperature sensor -G56- is installed with only one display in the -E87-. -G56- cannot be checked or replaced individually, if malfunctioning replace -E87- completely.
Display group 008: Voltage at fresh air blower -V2-, voltage at terminal 58d, terminal 58s
Display group 009: Engine speed, vehicle speed and auxiliary heater
Display group 10: Coolant temperature switch, A/C compressor cut-in, A/C pressure switch -F129- and activation of rear window heating
Display group 11: Last four compressor cut-off conditions
Display group 12: Idle RPM increase, activation coolant fan, ignition key coding
NOTE:
- Display group "012" is only valid for A/C control heads with part number 8D0 820 043 after index "M" (version with one display).
- Since an immobilizer is not being offered in the USA at this time, it is not possible to adapt an ignition key for these vehicles.
