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 (plenum chamber, left) must be OK:





• The respective fuses of Secondary Air Injection (AIR) Solenoid Valve (N112) must be OK:





• 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.

Checking 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

- Check wire for short circuit to B+ and Ground (GND).

Specified value: infinite ohms

- Check wire between 2-pin connector terminal 1 and the B+ connection in wiring harness 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).

Final Procedures

After the repair work, the following work steps must be performed in the following sequence:

1. Check the DTC memory. Refer to --> [ Diagnostic Mode 03 - Read DTC Memory ] Diagnostic Modes 01 - 09.

2. If necessary, erase the DTC memory. Refer to --> [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Modes 01 - 09.

3. If the DTC memory was erased, generate readiness code. Refer to --> [ Readiness Code ] Monitors, Trips, Drive Cycles and Readiness Codes.