Secondary air injection solenoid valve, checking

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Engine code AEG

Special tools and equipment

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

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V.A.G 1594 Adapter set

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

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V.A.G 15927 Diode test light

Refer to Electrical Wiring Diagrams, Troubleshooting & Component Locations

Requirements

Coolant temperature 5 ° to 33 ° C
Secondary air injection pump motor OK

Work sequence

Fig 3: Secondary Air Injection Solenoid Valve Upper Vacuum Hose

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Pull upper vacuum hose (arrow) off secondary air injection solenoid valve.
Start engine and run at idling speed.

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

If no vacuum is perceptible:

Switch engine off.

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

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Disconnect 2-pin connector from secondary air injection solenoid valve (arrow).

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.):

Replace secondary air injection solenoid valve.

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.