Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSAUDI2004A4 BASE, 4D SEDAN, 3.0 TREPAIR AND DIAGNOSISHEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSON BOARD DIAGNOSTIC (OBD)AUTOMATIC CLIMATE CONTROL SYSTEM, ON BOARD DIAGNOSTIC (OBD)READ MEASURING VALUE BLOCK (FUNCTION 08)

2004 Audi A4 Base, 4D Sedan, 3.0 T

Read Measuring Value Block (function 08)

2004 Audi A4 Base, 4D Sedan, 3.0 TSECTION Read Measuring Value Block (function 08)

NOTE:

To test speed signal push the vehicle several meters (more than 5 km/h) with the ignition switched on.
Component locations of activated components, see A/C SYSTEM CONTROL AND REGULATION COMPONENTS .

With ignition switched off connect VAS 5051 Vehicle Diagnostic, Testing and Information System with VAS 5051/1 diagnostic cable to 16-pin data link connector on vehicle. See VAS 5051 VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM, CONNECTING AND SELECTING FUNCTIONS .
Switch ignition on or start engine.
Select "Auto" operating mode on A/C Control Head -E87-
Select "Address word" 08 for A/C heater/electronics. See VAS 5051 VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM, CONNECTING AND SELECTING FUNCTIONS .

Indicated on display of VAS 5051:

Fig 1: VAS 5051 Scan Tool Display - Reading Measuring Value Block (1 Of 4)

Courtesy of AUDI OF AMERICA, INC.

Check DTC memory. See DIAGNOSTIC TROUBLE CODE (DTC) MEMORY, CHECKING (FUNCTION 02) .
Press buttons -0- and -8- to select "Read Measuring Value Block" function 08.

Indicated on display of VAS 5051:

Fig 2: VAS 5051 Scan Tool Display - Reading Measuring Value Block (2 Of 4)

Courtesy of AUDI OF AMERICA, INC.

Display field -1- indicates request to input display group.
Display field -2- shows input keyboard.

Input via the keyboard in display field -2- the desired display group (e.g. "001" or "01"), overview of display groups numbers which can be selected. See OVERVIEW OF SELECTABLE DISPLAY GROUP NUMBERS and accept by touching the Q-button.

Indicated on display of VAS 5051

Fig 3: VAS 5051 Scan Tool Display - Reading Measuring Value Block (3 Of 4)

Courtesy of AUDI OF AMERICA, INC.

Display field -1- shows the selected display group.
Display field -2- shows the values of the four display fields:
- The value of display field -1- is shown in the first row.
- The second, third and fourth rows show the value of the respective display fields.
- If a display field is not assigned, no display occurs in this row.
By touching button -3- you can switch to another display group. See Fig 4.
You can switch to another function (e.g. from "Basic setting" to "Read Measuring Value Block" and back) by touching button -4-.

Input display group number; overview of display group numbers which can be selected. See OVERVIEW OF SELECTABLE DISPLAY GROUP NUMBERS .

Fig 4: VAS 5051 Scan Tool Display - Reading Measuring Value Block (4 Of 4)
Courtesy of AUDI OF AMERICA, INC.

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.