Scan Tool Testing and Procedures

Testing Wiring And Components Using VAG1598/31 Breakout Box

NOTE:
- VAG1598/31 breakout box is designed to be connected to the engine control module harness and to the engine control module simultaneously.
- The effect of this design is that the electronic engine controls remain fully functional while the breakout box is connected (for e.g. measuring signal strengths while the engine is running).
- Look in the respective test descriptions to see if it is necessary to connect the engine control module to the breakout box.
- Use multimeter (Fluke 83 or equivalent) or VAG1715 Multimeter in addition to VAG1527B voltage tester.
- Always use test leads from VW1594 connector test kit when connecting test equipment to VAG1598/31 breakout box.
- Once the engine control module has been reconnected, adapt the engine control module to the throttle valve control module.

CAUTION: Before connecting the test leads, switch the test equipment to the appropriate measuring range and observe the test requirements to prevent damage to electronic components.

- Switch ignition off.
- Remove control module protective housing cover.







- Using screwdriver, carefully pry off retainer (arrow).
- Release and disconnect harness connectors from control module.







- Connect VAG1598/31 breakout box to harness connector. Connect breakout box Ground clip (not visible in illustration) to battery negative terminal. Check respective test descriptions to see if it is necessary to connect engine control module to breakout box.
- Perform tests as described in respective repair instructions.
- Disconnect 15-pin harness connector for cruise control switch, clutch vacuum vent valve switch -F36- and to brake vacuum vent valve switch -F47- for cruise control.
- Check the following connections for a short to positive, short to Ground (GND) or an open circuit:

Gasoline engine: 2.7 liter/184 kW V6 twin-turbo

Terminals on 15-pin harness connector VAG1598/31 breakout box, socket
7 76
8 75
9 57
10 38

- If necessary, repair open or short circuit.








- If necessary, repair open or short circuit.