Beetle L4-1781cc 1.8L Turbo (APH) (1999)
Intake Air Temperature Sensor: Testing and Inspection
Intake Air System, Checking For Leaks (False/Unmetered Air)
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
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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
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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). See: Testing and Inspection/Reading and
Clearing Diagnostic Trouble Codes/Scan Tool Connecting/With Manufacturer's Scan Tool/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.