Secondary Air Injection Solenoid Valve, Checking

SECONDARY AIR INJECTION SOLENOID VALVE, CHECKING

Special tools, testers and auxiliary items
- VW 1594 connector test kit
- VAG 1527 voltage tester

Test conditions
- Engine oil temperature 15-35 °C (59-95 °F)
- Secondary air injection pump motor OK.





Test sequence
- Disconnect vacuum hose (arrow) from check valve -1-.
- Start engine and run at idle.

- When the secondary air injection pump motor runs, intake manifold vacuum must be present at vacuum hose.

If no intake manifold vacuum is present:
- Stop engine (switch ignition off).
- Disconnect 2-pin connector from secondary air injection solenoid valve.
- Connect VAG 1527B voltage tester to 2-pin connector using adapter cables from VW 1594 connector test kit.
- Start engine and run at idle.

- LED must light-up

If YES (voltage supply OK):





- Replace secondary air injection solenoid valve -2-.

If LED does not light up:
- Reconnect 2-pin connector.
- Check activation of secondary air injection pump motor.
- Check Diagnostic Trouble Code (DTC) memory for stored malfunctions.