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







- Fuses in E-box (in plenum chamber, left) must be OK:
- Motronic Engine Control Module (ECM) Power Supply Relay -J271- -position A3- must be OK, check:
- Ground (GND) connections between engine and chassis must be OK.
- Ignition switched off.


Test sequence







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


Checking resistance







- Measure resistance between terminals of solenoid valve.
Specified value: 55.0 to 65.0 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 - Erase DTC Memory
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes

If specified value is obtained:
- Check wires according to wiring diagram.


Check wiring
- Connect test box to control module wiring harness. Connecting Test Box For Wiring Test







- Check wire between test box socket 44+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 Motronic Engine Control Module (ECM) Power Supply Relay -J271- for open circuit according to wiring diagram

Wire resistance: max. 1.5 ohms.

- Erase DTC memory of Engine Control Module (ECM). Diagnostic Mode 04 - Erase DTC Memory
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes

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