Work sequence

Fig 1: Upper Vacuum Hose & 2-Pin Connector Of Secondary Air Injection Solenoid Valve

Courtesy of VOLKSWAGEN UNITED STATES, INC.

• Pull upper vacuum hose - arrow  - of secondary air injection solenoid valve.
• Start engine and let it idle.

It will be possible to feel a vacuum at secondary air injection solenoid valve nozzles.

If no vacuum can be detected:

• Switch ignition off.
• Remove 2-pin connector from secondary air injection solenoid valve - 1  -.

Fig 2: Checking 2-Pin Connector Of Secondary Air Injection Solenoid Valve Voltage

Courtesy of VOLKSWAGEN UNITED STATES, INC.

• Connect Voltage tester VAG 1527 B to disconnected attachment plug using auxiliary cables from Supplemental measuring toolset VAG 1594 A.

If the LED illuminates (power supply OK):

• Turn off ignition.
• Replace Secondary Air Injection (AIR) Solenoid Valve N112.

If the LED does not illuminate:

• Clip on 2-terminal attachment plug.
• Start output diagnostic test mode and trigger the Secondary Air Injection (AIR) Solenoid Valve N112 : Refer to 01 ON BOARD DIAGNOSTIC (OBD)
• Check DTC memory: Refer to 01 ON BOARD DIAGNOSTIC (OBD)
• Read readiness code: Refer to 01 ON BOARD DIAGNOSTIC (OBD)

• If DTC memory was erased or engine control unit was separated from positive voltage supply, readiness code must be regenerated: Refer to 01 ON BOARD DIAGNOSTIC (OBD)