Activating Wastegate bypass regulator valve N75 :

• Press → key.

Indicated on display:

Valve must click.

If the valve does not click:

Fig 1: Wastegate Bypass Regulator Solenoid Valve & Connector

Courtesy of VOLKSWAGEN UNITED STATES, INC.

• Pull connector - 1  - off valve - 2  - and connect voltage tester VAG1527B with aux. cables from VAG1594 to disconnected connector.

LED must flash

LED flashes:

• Proceed with Output Diagnostic Test Mode until completed.
• Switch ignition off.
• Replace valve. → 21 - TURBOCHARGER, G-CHARGER
• Check DTC Memory, if necessary, repair any malfunctions and then Erase DTC Memory → DTC memory (functions 02 and 05), checking and erasing 

• Read readiness code → Readiness code, reading  . If DTC memory has been erased, readiness code must be generated again:

Engine code AWW, → Readiness code for engine code AWW, generating 

Engine code AWP, → Readiness code for engine code AWP, generating 

LED does not flash:

• Proceed with Output Diagnostic Test Mode until completed.
• Switch ignition off.

Fig 2: Identifying Test Box V.A.G 1598/31 Connected To Control Module Wiring Harness

Courtesy of VOLKSWAGEN UNITED STATES, INC.

• Connect test box VAG1598/31 to control module wiring harness. The engine control module remains disconnected.
• Check wire between test box socket 104 + 2 pin connector contact 2 for open circuit using wiring diagram.

Wire resistance: max. 1.5 Ω

• Additionally check wire for short to battery positive and Ground (GND).

If no malfunction in wire is detected:

• Check wire between 2 pin connector contact 1 and fuel pump (FP) relay J17 for open circuit using wiring diagram.

Wire resistance: max. 1.5 Ω

If no wiring malfunction is detected:

• Replace engine control module → Engine control module, replacing  .