Secondary Air Injection (AIR) Solenoid Valve -N112-, checking
WARNING: This page does not describe the selected car, but rather 11 other vehicles, including the 1999 Volkswagen Jetta, 1999 Volkswagen GTI, 1998 Volkswagen Jetta, 1998 Volkswagen GTI, and 1997 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.
- Engine oil temperature 15 -85 C (58-185 F)
- Disconnect vacuum hose from AIR Inlet Valve, and route upwards.
- Start engine and run at idle.
- After approx. 20 seconds the AIR Pump Motor (V101) should run for approx. 5 seconds, and intake manifold pressure must be perceptible at vacuum hose
If no intake manifold vacuum is perceptible:
- Stop engine.
- Disconnect 2-pin connector from AIR Solenoid Valve -N112-.
- Connect VAG 1527B voltage tester to the open connector using cables from VAG 1594 adapter kit.
- Start engine and run at idle.
- After approx. 20 seconds, LED must light for approx. 5 seconds.
If LED lights (voltage supply OK):
- Replace Secondary Air Injection (AIR) Solenoid Valve -N112-.
If LED does NOT light:
- Reconnect 2-pin connector.
- Check activation of Secondary Air Injection (AIR) Solenoid Valve (N112):
See ELECTRICAL TESTING WITH (VAG1598 TEST BOX)
If AIR Solenoid Valve -N112- cannot be felt to switch during the electrical check:
- Check for malfunction of Secondary Air Injection (AIR) Pump Relay -J299-:
- Check Diagnostic Trouble Code (DTC) Memory: