Secondary Air Injection (Air) Valve, Checking

Secondary Air Injection (AIR) valve, 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






- The respective fuses of Secondary Air Injection (AIR) Solenoid Valve -N112- must be OK.
- Ignition switched off.

Test sequence






- Disconnect 2-pin connector -1- from Secondary Air Injection (AIR) Solenoid Valve -N112- (-2-).






- Measure resistance between terminals of solenoid valve.

Specified value: 25.0 to 35.0 Ohms.

If specified value is not obtained:

- Replace Secondary Air Injection (AIR) Solenoid Valve -N112-.

- Erase DTC memory of Engine Control Module (ECM). Diagnostic Mode 04: Reset/Delete Diagnostic Data

- Generate readiness code. Audi Drive Cycle/Readiness Code

If specified value is obtained:

- Connect test box to control module wiring harness.






- 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: Infinity 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-.