Initial Inspection and Diagnostic Overview
VAG1551 (VAG1552) Scan Tool (ST), connecting and selecting functions
Requirements
- All fuses OK per wiring diagram
- Battery positive voltage (B+) OK
- Ignition switched on or engine running (engine speed less than 3000 RPM)
- Connect VAG1551 (VAG1552) scan tool to 16-pin Data Link Connector (DLC) to left of steering column, using adapter cable VAG1551/3.
Indicated on display 1):
V.A.G - ON BOARD DIAGNOSTIC HELP
1 - Rapid data transfer
2 - Blink code output
1. Operating modes 1 and 2 are displayed alternately
NOTE:
- If no readout is displayed of the VAG1551 Scan Tool, check Data Link Connector (DLC) wiring, according to wiring diagram. Under "Powertrain Management",
- Additional operating information can be displayed by pressing the HELP button on VAG1551 Scan Tool.
- The button is used for moving forward within program.
- Pressing PRINT button switches on the printer (indicator lamp in button comes on).
- The DTC memory cannot be erased until it has been checked.
- Switch ignition on or start engine, respectively.
- Press -1- button to select "Rapid Data Transfer" operating mode 1.
Indicated on display
Rapid data transfer HELP
Insert address word XX
- Press buttons -0- and -8- to select "AC/Heating Electronics" address word 08.
Indicated on display
Rapid data transfer Q
08. AC/Heating Electronics
- Press -Q- button to confirm input.
Indicated on display after selecting address word 08:
Rapid data transfer
Scan Tool sends address word 08
- After a short time A/C control head identification, coding and dealership code of VAG1551 Scan Tool are displayed:
4D0 820 043 C D2 AC fully auto DXX
Coding XXXXX WSC ZZZZZ
Control module identification: 4D0 820 043 C D2 AC fully automatic.
List of functions Page
01 - Check Control Module Versions
02 - Check DTC Memory
03 - Output Diagnostic Test Mode
04 - Basic Setting
05 - Erase DTC Memory
06 - End Output
07 - Code Control Module
08 - Read Measuring Value Block
Only the functions listed here can be used for AC/Heating Electronics OBD program.
- Press -> button.
Indicated on display (function selection, e.g. 02 - Check DTC Memory):
Rapid data transfer HELP
Select function XX
NOTE:
- A list of the possible functions is printed out after pressing the HELP button:
- After pressing the button, the program of VAG1551 returns to the starting position.
If one of the following DTC messages is displayed:
Rapid data transfer HELP
Control module does not answer
- Press the HELP button to print out list of possible causes.
Rapid data transfer HELP
K wire not switching to B+
- Check wiring to Data Link Connector (DLC) according to the wiring diagram. Under "Powertrain Management",
Rapid data transfer ->
No signal from control module
If this display appears at the beginning of or during the OBD program, malfunctions have occurred and data transfer is no longer possible between VAG1551 Scan Tool and A/C control head -E87-.
Rapid data transfer ->
Error in communication link
- Check wiring to DLC, according to the wiring diagram. Under "Powertrain Management",
- After repairing the possible causes of the malfunction, once again select address word 08 for "AC/Heating Electronics" and confirm entry with -Q- button.
Indicated on display after selecting address word 08:
Rapid data transfer
Scan Tool sends address word 08
The following display appears: control head identification, coding and dealership code of VAG1551 are displayed.
4D1 820 043 C D2 AC fully auto DXX
Coding XXXXX WSC ZZZZZ
- Press -> button.
Indicated on display (function selection, e.g. 02 - Check DTC memory)
Rapid data transfer HELP
Select function XX