Beetle L4-2.0L (AEG) (2000)
Knock Sensor: Testing and Inspection
With Manufacturer Scan Tool
Knock Sensors, Checking
NOTE:
-
Intake manifold must be removed to remove and install the knock sensors.
-
Knock sensor tightening torque of 20 Nm (15 ft lb) must be maintained to ensure the knock sensors perform perfectly.
-
Only gold-plated terminals may be used when servicing the knock sensor connector terminals.
Special tools, workshop equipment, testers, measuring instruments and auxiliary items required
-
VAG 1551/1552 Scan Tool using VAG 1551/3 adaptor cable
-
VAG 1598/22 Test Box
-
Fluke 83 multimeter
-
VW 1594 Adaptor kit
-
Wiring diagram
Test conditions
-
On Board Diagnostic must store a malfunction for one or both knock sensors.
Function, checking
-
Connect VAG 1551/1552 Scan Tool. Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks" See: Testing and Inspection
-
Start engine and let idle.
-
Press 0 and 1 buttons to select "Address word" 01: "Engine electronics"
06A906018AB Motronic M5.9.2 HS V06
-> Coding 00000
WSC 00000
Display will appear as shown (example only)
-
Press -> button.
Rapid data transfer
HELP
Select function XX
Display will appear as shown
-
Press 0 and 8 buttons to select Function 08: "Read measuring value block"
-
Press Q button to enter input.
Read measuring value block
HELP
Input Display group number XXX
Display will appear as shown
-
Press 0, 2 and 2 buttons to select "Display group 22" (cylinders 1 and 2),
and/or
-
Press 0, 2 and 3 buttons to select "Display group 23" (cylinders 3 and 4).
-
Press Q button to enter input.
Read measuring value block 22
->
1
2
3
4
Display will appear as shown (1 to 4 = Display zones)
-
Take a test drive and check specified values for knock control on Scan Tool display (display fields 3 and 4).
NOTE: Knock sensor checking must be conducted during a test drive since the knock sensor diagnostic is active at an engine speed greater than 3000
RPM and an engine load greater than 3 ms.
Observe the appropriate safety precautions during test drive.