Scan Tool Connecting and Initial Checks

VAG 1551/1552 Scan Tool (ST), VAS 5051 Vehicle Diagnostic Testing And Information System Or VAS 5052 Vehicle Diagnostic And Service System, Connecting And Selecting Functions

Scan Tool (ST) and test equipment safety precautions

WARNING:
- Due to weight, size and need for manual operation of test instruments while vehicle is driven on public roads, instrument must be used only with a Driver operating the vehicle and an Instrument Operator operating the test equipment.
- Do not use Instrument with Driver only. Always use two persons to conduct test.
- Do not place Instrument on lap of Driver or front seat passenger because emergency stop may dislodge Instrument and cause airbag deployment with risk of injury to Instrument Operator.
- Use of Instrument in Audi TT Coup:
- Place Instrument in rear seating area and secure by available safety belt.
- Instrument Operator must be seated in the other rear seating position, after sliding front passenger seat and moving the seat back as far forward as possible. Do not activate the seat back release lever.
- Instrument Operator must wear safety belt.
- Use of Instrument in Audi TT Roadster:
- Use only Instrument VAG 1551 Scan Tool (ST) or VAS 5052 Vehicle Diagnostic and Service System. DO NOT USE VAS 5051.
- Before test, deactivate passenger's airbag using key operated switch in glove compartment.
- Instrument Operator must be seated on passenger seat with safety belt worn.
- Place Instrument in foot well in front of passenger seat in a manner allowing the Operator to use the Instrument in a safe manner.
- After completion of test, re-activate front passenger airbag.

CAUTION:
To prevent damage to electronic and electrical components, note the following:
- Always switch off the ignition before connecting or disconnecting test instruments.
- During some of the tests the control module may identify and record DTCs. The Diagnostic Trouble Code (DTC) memory should therefore be checked and (if necessary) erased after completing the tests and any repair work that may be required.

Test conditions
- Battery voltage at least 11 V
- Ground connections on engine and transmission OK
- Fuses OK
- Ground connections and Ground point for transmission OK

- Check battery Ground strap and Ground strap between battery and transmission.
- Switch off ignition.







- Connect VAG 1551/1552 Scan Tool (ST) with lead VAG 1551/3 or connect VAS 5051/5052 with appropriate adapter.

NOTE: The Data Link Connector (DLC) is located under the instrument panel, left.

WARNING:
- When taking test readings while the vehicle is moving, VAG 1551/1552/VAS 5052 tester must always be secured to the rear seat and operated from this position.
- DO NOT USE VAS 5051 during a road test.

Indicated on display:

VAG - ON BOARD DIAGNOSTIC HELP
1 - Rapid data transfer*
2 - Flash code output*

* Appears alternately

NOTE: If the display remains blank:
- See Scan tool operating instructions

- Switch on ignition
- Switch on printer with the Print button (Warning lamp in button lights up).
- Press button -1- for "Rapid data transfer."

Indicated on display:

Rapid data transfer HELP
Enter address word XX

NOTE: Address word 00 is used to carry out the automatic test sequence, i.e. checking the DTC memory via rapid data transfer for all vehicle systems with On Board Diagnostic (OBD) capability.