Golf GL L4-2.0L (AEG) (2001)
Knock Sensor: Testing and Inspection
With Manufacturer's Scan Tool
Knock Sensor, Checking
NOTE:
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It is extremely important to keep to the tightening torque of 20 Nm (15 ft lb) to ensure the knock sensors function normally.
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Only gold plated terminals may be used when servicing the knock sensor harness connector terminals.
Special tools and equipment
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V.A.G1551 Scan Tool (ST) or VAG1552 mobile scan tool with VAG1551/3 adapter cable
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VAG1598/22 test box
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Multimeter (Fluke 83 or equivalent)
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VW1594 adapter set
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Wiring diagram
Test conditions
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The On Board Diagnostic (OBD) must have recognized a malfunction of one or both knock sensors. See: Powertrain Management/Computers
and Control Systems/Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/Reading Diagnostic Trouble Codes
Checking function
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Connect V.A.G1551 Scan Tool (ST) or VAG1552 mobile scan tool. Start engine and press buttons -0- and -1- to select "Engine Electronics"
address word 01. Engine must be running at idle speed when performing this step. See: Powertrain Management/Computers and Control
Systems/Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/Scan Tool Connecting
Indicated on display:
Rapid data transfer
HELP
Select function XX
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Press buttons -0- and -8- to select "Read Measuring Value Block" function 08, and press -Q- button to confirm input.
Indicated on display:
Read Measuring Value Block
Input display group number XXX
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Press buttons -0-, -2- and -2- to input display group number 22 (022), and press -Q- button to confirm input.
Indicated on display: (1-4 = display fields)
Read Measuring Value Block 22
->
1
2
3
4
NOTE: Check the knock sensors during a road test. The knock sensors diagnostic is not activated until the engine speed exceeds 3000 RPM and the
engine is under more than 40% load.
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Perform the road test and check knock control Specified values on display (display fields 3 and 4).
Observe the valid safety precautions when performing a road test. See: Powertrain Management/Ignition System/Service Precautions/Technician
Safety Information