Checking wiring

• Remove wiper arms and plenum chamber cover. → 92 WINDSHIELD WIPER & WASHER SYSTEM

Fig 1: Identifying Test Box V.A.G 1598/31 Connected To Control Module Wiring Harness

Courtesy of VOLKSWAGEN UNITED STATES, INC.

• Connect Test box VAG 1598/31 to control module wiring harness. Engine Control Module (ECM) is not connected by this action.

Fig 2: 3-Pin Harness Connector & Terminals

Courtesy of VOLKSWAGEN UNITED STATES, INC.

• Check wiring between test box and 3-pin harness connector for open circuit using wiring diagram.

• Also, check wires for short to one another. Specified value: ∞Ω~

If no wiring fault is detected:

• Loosen knock sensor and re-tighten to 20 Nm.
• Perform road test again and check knock control specifications on display.

During the road test the following conditions must be fulfilled:

• Coolant temperature must exceed 85 ° C.
• When temperature is reached, operating conditions Idling, Part throttle, Wide Open Throttle (WOT), and Overrun must be attained several times
• At Wide Open Throttle (WOT) engine speed must exceed 3500 RPM

• Again, check DTC memory of control module.

If the malfunction is still present:

• Replace Knock sensor G61 or Knock sensor G66 , or.
• Check DTC memory. If necessary, repair any malfunctions and erase DTC memory → Diagnostic Trouble Code (DTC) memory, checking and erasing (scan tool functions 02 and 05)  .
• Display readiness code → Readiness code (function 15), displaying  . If DTC memory has been erased, readiness code must be generated again → Readiness code (function 15), generating  .