Secondary Air Injection Valve, Checking

Diagnostic Procedures

Secondary Air Injection Valve, Checking

Solenoid valve is closed when no voltage is present.

Special tools, testers and auxiliary items required

• Multimeter (VAG1526) or multimeter (VAG1715)

• Connector test kit (VAG1594)

• Wiring diagram

Test requirements

• Fuses in E-box (in plenum chamber, left) must be OK:





• Motronic Engine Control Module (ECM) Power Supply Relay (J271) 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 4: Reset/erase diagnostic data.

- Generate readiness code.

If specified value is obtained:

- Check wires according to wiring diagram.

Check wiring

- Connect test box to control module wiring harness , connect 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: infinite 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 4: Reset/erase diagnostic data.

- Generate readiness code.

If no malfunctions are found in wires:

- Replace Motronic Engine Control Module (ECM) (J220).