Work sequence

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2002 Volkswagen Jetta, 2002 Volkswagen GTI, 2001 Volkswagen Jetta, 2001 Volkswagen GTI, and 2000 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.

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)