Air Injection Vacuum Control Solenoid Valve: Testing and Inspection

Secondary Air Injection (AIR) Solenoid Valve (Vehicles with engine code AEG), checking

Solenoid valve is closed when no voltage is present.

Recommended special tools and equipment
- VAG1526 multimeter or VAG1715 multimeter
- VAG1594 connector test kit
- Wiring diagram

Test requirements






- Main fuses must be OK.
- Ignition switched off.

Test sequence






- Disconnect 2-pin connector from Secondary Air Injection (AIR) Solenoid Valve -N112- (arrow).





- Measure resistance between terminals of solenoid valve. Specified value: 25,0...35,0 ohms.

If specified value is not obtained:
- Replace Secondary Air Injection (AIR) Solenoid Valve -N112-, item 2 .
- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data.
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes

If specified value is obtained:

- Connect test box to control module wiring harness, connect test box for wiring test.

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- Check wire between test box socket 33 + 2-pin connector terminal 2 for open circuit according to wiring diagram. Wire resistance: max: 1.5 ohms
- Also check the wire for short circuit to B+ and Ground (GND). Specified value: infinite ohms

- Check wire between 2-pin connector terminal 1 and the Fuel Pump (FP) Relay -J17- for open circuit according to wiring diagram. Wire resistance: max: 1.5 ohms

If no malfunctions are found in wires:
- Replace Motronic Engine Control Module (ECM) -J220-.