Secondary air injection solenoid valve, checking

WARNING: This page is about a different variant/trim than selected.

Engine code AEG

Special tools and equipment

Fig 1: Identifying V.A.G 1594 A Adapter Set

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Fig 2: V.A.G 15927 Diode Test Light

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Refer to Electrical Wiring Diagrams, Troubleshooting & Component Locations

Requirements

Work sequence

Fig 3: Secondary Air Injection Solenoid Valve Upper Vacuum Hose

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When secondary air injection pump motor runs a vacuum must be perceptible at secondary air injection solenoid valve union.

If no vacuum is perceptible:

Fig 4: Secondary Air Injection Solenoid Valve 2-Pin Connector

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Fig 5: Connecting Voltage Tester To The Outer Contacts Of Connector

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Connect voltage tester V.A.G 1527B to the outer contacts of connector with auxiliary cables from V.A.G 1594C.
Start engine and run at idling speed.

LED must light up

LED lights up (voltage supply OK.):

If LED does not light up:

Connect 2-pin connector
Check activation of valve. Refer to Adapting components and functions , Adapting functions and components.
Check wiring:

Refer to Electrical Wiring Diagrams, Troubleshooting & Component Locations

Read DTC memory. Refer to Engine control module Diagnostic Trouble Code (DTC) memory, interrogating and erasing
Read readiness code: Refer to Adapting components and functions , Adapting components and functions.
Generate readiness code again if DTC memory has been erased or engine control module was disconnected from permanent positive. Refer to Adapting components and functions , Adapting components and functions.