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Home >> Volkswagen >> 1999 >> New Beetle (1C1) L4-1.8L Turbo (APH) >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Component Tests and General Diagnostics >> Intake Air System, Checking For Leaks (False/Unmetered Air) >> With Manufacturer's Scan Tool

With Manufacturer's Scan Tool



Intake Air System, Checking For Leaks (Unmetered Air)

Checking with engine leak detector spray G 001 800 A1

NOTE: The vacuum in the intake system will cause the leak detector spray to be drawn in with the unmetered air. The leak detector spray reduces the combustibility of the mixture. This leads to a drop in engine speed and to a change of oxygen sensor reading.
The safety precautions listed on the container must be adhered to.

Special tools, test equipment and auxiliary items
- Scan tool V.A.G 1551 or vehicle system tester VAG 1552 with cable VAG 1551/3B
- Engine leak detector spray G 001 800 A1

Test conditions
- Coolant temperature at least 85°C

Test sequence
- Connect scan tool V.A.G 1551 (V.A.G 1552). Start engine and select "Address word" 01 of engine control module. When doing this the engine must be running at idle speed. Connecting scan tool and selecting Engine Control Module (ECM). [1][2][3]Connecting VAG 1551 Scan Tool

Indicated on display

Rapid data transfer HELP
Select function XX

- Press keys 0 and 8 for the function "Read measuring value block" and confirm entry with Q key.

Indicated on display

Read measuring value block
Input display group number XXX

- Press keys 0, 0 and 1 for "Display group number 1" and confirm entry with Q key.

Indicated on display (1-4 = Display zones)

Read measuring value block 1 ->
1 2 3 4

- Check whether the coolant temperature is above 85°C in display zone 2.
- Observe the engine speed in display zone 1 and the oxygen sensor control before catalyst in display zone 3.

Display Group 1:






- Systematically spray parts of the intake system with engine leak detector spray.

If the engine speed drops or the oxygen sensor control changes:
- Press -> key.
- Press keys 0 and 6 for the function "End output" and confirm entry with the Q key.
- Switch off ignition.
- Check sprayed areas of intake system for leaks and rectify if necessary.

If the engine speed and the oxygen sensor control do not change:
- Press -> key.
- Press keys 0 and 6 for the function "End output" and confirm entry with the Q key.
- Switch off ignition.
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