Checking wiring

• Connect V.A.G 1598/31 test box to control module wiring harness. Engine control module remains disconnected.
Fig 1: Connecting V.A.G 1598/31 Test Box To Control Module Wiring Harness
Courtesy of VOLKSWAGEN OF AMERICA, INC.
• Check wiring between test box and 2 -pin connector for open circuit according to wiring diagram.
  IGNITION, KNOCK CONTROL SPECIFICATIONS
  
  

  Test Between	-G61-	-G66-
  Terminal 1+Socket	106	107
  Terminal 2+Socket	99	99

  Wire resistance: max. 1.5 Ω

• Additionally check wires for short to one another.

  Specification: INFINITY Ω

Fig 2: Identifying Knock Sensor Harness Connector Terminals

Courtesy of VOLKSWAGEN OF AMERICA, INC.

If no wiring malfunction is detected:

• Loosen knock sensor and tighten again to 20 Nm.
• Perform a test drive again and check knock control specifications on display.

  Observe the valid safety precautions when road testing vehicle, see SAFETY PRECAUTIONS .

  During the road test the following operating conditions must be fulfilled:

  • Coolant temperature must exceed 85 °C.
  • When the temperature is reached, the operating conditions

    Idling

    Part throttle

    Wide open throttle

    Overrun

    must be attained several times.

    • At wide open throttle the engine speed must exceed 3500 rpm.
• Again check control module DTC memory.

If the malfunction is still present:

• Replace knock sensor(s).
• Check DTC Memory, if necessary, repair any malfunctions and then Erase DTC Memory, see DTC MEMORY, CHECKING AND ERASING (FUNCTIONS 02 AND 05) .
• Read readiness code, see READINESS CODE, READING . If DTC memory has been erased or engine control module was disconnected from permanent positive, readiness code must be generated again:

  Engine code AWW, see READINESS CODE FOR ENGINE CODE AWW, GENERATING

  Engine code AWP, see READINESS CODE FOR ENGINE CODE AWP, GENERATING