Air Injection Vacuum Control Solenoid Valve: Testing and Inspection
ELECTRICAL CHECKS- Disconnect Secondary Air Injection (AIR) solenoid valve -N112- harness connector.
Secondary Air Injection Solenoid Valve:
- Measure resistance between valve connector terminals using multimeter (Fluke 83 or equivalent).
^ Specified value: 25-35 ohms.
If the specified value is not obtained:
- Replace secondary air injection solenoid valve.
CHECKING VOLTAGE SUPPLY
- Disconnect secondary air injection solenoid valve harness connector.
2 Pin Harness Connector:
- Connect VAG 1527B voltage tester between terminal 1 (positive) of the disconnected harness connector and Ground (GND).
- Initiate output Diagnostic Test Mode. Refer to On-Board Diagnostics. Testing and Inspection
^ Specified value: LED must light up.
If LED does not light up, perform the following tests:
- Check secondary air injection solenoid valve fuse.
- Check wiring for continuity between terminal 1 on connector and fuse using wiring diagram.
^ Specified value: maximum 0.5 ohms.
- Check fuel pump relay and actuation.
CHECKING ACTUATION
2 Pin Harness Connector:
- Connect VAG 1527B voltage tester between connector terminals 1 and 2.
- Initiate output Diagnostic Test Mode (DTM) and actuate AIR solenoid valve -N112-.
^ Specified value: LED must blink.
If LED does not blink or lights up continuously:
- Connect VAG 1598 test box to wiring harness using adapter cable VAG 1598/11. Refer to VAG 1598 Pin Out Box Connecting. Connecting VAG 1598/31 Test Box
- The adapter harness for ECM is not connected.
If LED lights up continuously:
- Check wiring for short circuit to Ground (GND) between connector terminal 2 and VAG 1598 test box socket 16.
If LED does not blink:
- Check wiring for continuity between connector terminal 2 and VAG 1598 test box socket 16.
- Repair short circuit to GND and/or open circuit between connector terminal 2 and ECM connector C terminal 16.
If wiring OK:
- Replace ECM.