Combination Valve, Checking

Diagnostic Procedures

Combination Valve, Checking

Special tools, testers and auxiliary items required

• Hand Vacuum Pump (VAG1390)

Test requirements

• No leaks in vacuum lines or hose connections.

• Vacuum hoses not clogged or kinked

• Pressure and intake hose for Secondary Air Injection (AIR) Pump Motor not clogged or kinked.

• Ignition switched off.

Test sequence

- Disconnect vacuum hose from Secondary Air Injection (AIR) Solenoid Valve (N112) at combination valve (arrow).





- Connect hand vacuum pump ((VAG1390)) to vacuum connection of combination valve (arrow).





• Do not use pressurized air for the following test!

- Disconnect pressure hose (arrow) from Secondary Air Injection (AIR) Pump Motor (V101) at pressure line.





- Attach assisting hose onto pressure line and blow into with light pressure.

Combination valve must close.

- Operate vacuum pump.

Combination valve must open.

If the combination valve does not open or it is constantly open:

- Replace combination valve.

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.