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HOMESERVICE MANUALSAUDI2005A6 3.2 TREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 13 (3.0L - ENGINE CONTROLS - FUEL INJECTION & IGNITION, ENGINE CODE(S): AVK, BGN)28 IGNITION/GLOW PLUG SYSTEMIGNITION SYSTEM, CHECKINGKNOCK SENSORS, CHECKING
2005 Audi A6 3.2 T

Knock sensors, checking

2005 Audi A6 3.2 TSECTION Knock sensors, checking
WARNING: This page is about a different car, the 2006 Audi A4, 2005 Audi A4, 2004 Audi A4, 2003 Audi A4, and 2002 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying Special Tools - Knock Sensors, Checking
GW00015739Courtesy of VOLKSWAGEN UNITED STATES, INC.

Special tools and equipment 

  • VAG1526 A
  • VAG1594 A
  • VAG1598/31
NOTE:
  • The Knock Sensor (KS) 1 -G61- and Engine Coolant Temperature (ECT) sensor -G62- cannot be tested by themselves electrically.
  • Use only gold-plated terminals when repairing the cable connectors for the knock sensors.
  • Make sure that the knock sensors function properly it is important to keep to the specified tightening torque of 20 Nm.
  • Check connector between knock sensor and wiring harness for corrosion.

Testing knock sensor wiring 

  • Disconnect connector of relevant knock sensor. See Figure or Figure.
Fig 2: 3-Pin Connector & Terminals
GW00001103Courtesy of VOLKSWAGEN UNITED STATES, INC.
  • Test for short between all three terminals in knock sensor connector (terminals 1+2, 1+3, 2+3).
  • Specified value: ∞ Ω (no continuity) - the wires must not be connected to each other.
  • If there is a connection between terminals, install a new knock sensor.

If no malfunction is found:

Checking wiring from knock sensors to engine control module 

  • Connect test box VAG1598/31 to wiring harness for engine control module; do not connect engine control module. Refer to Wiring and component check with test box VAG 1598/31 .
  • Check for open circuit and short to ground/positive or ground in following wiring connections:
Fig 3: Identifying 3-Pin Connector Terminals 1 & 3
GW00000673Courtesy of VOLKSWAGEN UNITED STATES, INC.
  • Knock Sensor (KS) 1 -G61- (Bank 1)
Connector 
Terminal 		 Test box VAG1598/31 
Socket 
1 (signal) 106
2 (ground) 99
3 (screening) 108
  • Knock Sensor (KS) 2 -G66- (Bank 2)
Connector 
Terminal 		 Test box VAG1598/31 
Socket 
1 (signal) 107
2 (ground) 99
3 (screening) 108
  • Repair any open/short circuit as necessary.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.