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Home >> Audi >> 1996 >> A6 Quattro Sedan (4A2) V6-2.8L (AFC) >> Repair and Diagnosis >> Heating and Air Conditioning >> Testing and Inspection >> Initial Inspection and Diagnostic Overview >> On Board Diagnostics Via Scan Tool >> Automatic Climate Control >> Checking and Erasing DTC Memory >> With Nippondenso Compressor

With Nippondenso Compressor


Test Conditions

- All fuses OK according to wiring diagram

Note:
- DTC memory must be checked before it can be erased.
- The main program for the A/C control head -E87- is switched OFF, and climate control is not operational, during the On Board Diagnostic (OBD) sequence (i.e. the A/C compressor, radiator coolant fan, etc., are not controlled).

Check DTC Memory - function 02

- Start engine.
- Press 'Auto button on NC control head.
- Drive vehicle a few yards at walking speed.
- Connect VAG 1551 Scan Tool to Data Link Connectors (DLC) in auxiliary relay panel I (left side of water plenum) using diagnostic cable VAG 1551/1 as follows:





- Remove cover from auxiliary relay panel I in plenum.
- Connect black connector to black DLC (battery positive voltage (B+) supply to DLC).
- Connect white connector to white DLC.
- Blue connector is not used.

Operating modes 1 and 2 are displayed alternately.

VAG On Board Diagnostic HELP
1 - Rapid Data Transfer
2 - Blink Code Output

Note: If there is no display on VAG 1551, check B+ power supply to the black DLC.
Press the HELP button to obtain additional operating information.
Press --> button to Step through program sequence.

- Press PRINT button to switch printer ON (button lights up).
- Press button -1- for 'Rapid data transfer" operating mode.

Indicated on display

Rapid data transfer HELP
Insert address word XX

- Press buttons -0- and -8- to insert "AC/Heating Electronics" address word 08.

Indicated on display

Rapid data transfer Q
08 - AC/Heating Electronics

- Press -Q- button to confirm input.

A/C control head identification and coding are displayed

4A0 820 043A Klima-Vollauutomat DXX -->
Coding 00062 WSC 23890

A/C control head coding description
1st and 2nd digIts (where applicable)

Code Description
00___ not used

Note:
A/C control head coding may be displayed with or without the 1st and 2nd digits (e.g. 062 instead of 00062), depending on the VAG 155? Scan Tool program card version.

3rd digit
Code A/C compressor type
0__ Zexel
1__ Nippondenso

4th digit
Code Engine application
_5_ 5-cylinder
_6_ 6-cylinder

5th digit
Code Market version Engine type
2 USA/Canada Gasoline

Example: coding "00062" -or- "062"
- Zexel compressor with 6-cylinder engine, USA/Canada

Notes:
Zexel A/C compressors have been installed from the start of production. During m.y. 1996, a new Nippondenso A/C compressor is installed as a running change on all vehicles with 6cyllnder engines.

On the Nippondenso compressor, A/C compressor speed sensor -G111- has been eliminated. The compressor is instead protected by an overheat fuse in A/C clutch -N25-.

The A/C control head -E87- is coded for the specific vehicle application, including the type of A/C compressor installed (Zexel or Nippondenso).

Vehicles equipped with a Nippondenso compressor must have an A/C control head -E87- identified with index letter "K" or higher to allow for correct coding. For proper part number and application of A/C control head -E87- refer to current parts catalog.

The software version displayed with A/C control head identification (shown here as "DXX" has no significance for Service Department use.

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