Rabbit L5-2.5L (BGP) (2006)
Knock Sensor: Testing and Inspection
Knock Sensor , Checking
This procedure is used to diagnose Knock Sensor (KS) 1 G61 and Knock Sensor (KS) 2 G66.
Special tools, testers and auxiliary items required
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Multimeter
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wiring diagram
NOTE:
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The manufacturers test box Adapter Cable (121-point) VAG 1598/31 is available for purchase or rental. Refer to the Tool catalog.
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Cylinders 1, 2 are monitored by Knock sensor (KS) 1 -G61-. Cylinders 3, 4 are monitored by Knock sensor (KS) 2 -G66-.
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Knock sensors themselves cannot be checked electrically.
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When servicing terminals in the harness connector of knock sensors, use only gold-plated terminals.
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For the knock sensors to function properly, it is important that the tightening torque be exactly 20 Nm.
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Contact surfaces between Knock Sensor (KS) 1 G61 and Knock Sensor (KS) 2 G66 and cylinder block must be free of corrosion, dirt and
grease.
Test requirements
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Mounting bolt of Knock Sensor (KS) 1 G61/Knock Sensor (KS) 2 G66 tightened to 20 Nm.
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Fuses for Engine Control Module (ECM) J623 OK.
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Battery voltage at least 12.5 volts.
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All electrical consumers such as, lights and rear window defroster, switched off.
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Vehicles with automatic transmission, shift selector lever into position "P" or "N".
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A/C switched off.
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Ground (GND) connections between engine/transmission/chassis OK.
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Ignition switched off.
Test sequence
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Remove engine cover - arrows -.
NOTE: The knock sensor electrical connectors can be identified by color. Knock Sensor (KS) 1 -G61- (Bank 1) is green. Knock Sensor (KS) 2
-G66- (Bank 2)is gray.
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Disconnect the electrical harness connector from Knock Sensor (KS) 1 G61 - 1 - or Knock Sensor (KS) 2 G66 - 2-.
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Using a Multimeter, check Knock Sensor (KS) 1 G61 or Knock Sensor (KS) 2 G66 component terminals 1+2 for a short to each other.
Specified value: infinity Ohms (No Continuity).
If the specification is not obtained:
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Replace respective Knock Sensor (KS) 1 G61/Knock Sensor (KS) 2 G66.
If the specification is obtained:
If the manufacturers test box is being used. Perform the following step.
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Install the test box.