Combination Valve For Secondary Air Injection (AIR), Checking Function and Proper Seal

Combination Valve For Secondary Air Injection (AIR), Checking Function And Proper Seal

Special tools and equipment







- VAG1390 Hand vacuum pump

Requirements
- Vacuum lines and hose connections leak-free.
- Vacuum lines not clogged.

Work sequence







- Remove rear engine cover (arrows).







- Remove bolts for holding plate for solenoid valves (arrows).
- Lift up holding plate and disconnect vacuum hose from Y-piece of combination valve to be checked.
- Connect VAG1390 hand vacuum pump to vacuum hose of combination valve to be checked.







- For vehicles with auxiliary heater, remove bolts (arrows) for exhaust pipe of auxiliary heater at sound insulation.







- Remove bolts or release quick-release screws -1- and -2- and remove front sound insulation.







- Disconnect pressure hose (arrow) at Secondary Air Injection (AIR) pump motor and blow into it with light pressure (do not use pressurized air).
- Both combination valves must be closed, it must not be possible to blow through hose
- Operate hand vacuum pump.
- Relevant combination valve must open, it must be possible to blow through

If the relevant combination valve does not open:
- Replace combination valve.




With Manufacturer's Scan Tool

Combination Valves For Secondary Air Injection (AIR) System, Checking Function And For Proper Seal

Recommended special tools and equipment







- VAG1390 Hand Vacuum Pump

Test requirements:
- No leaks in vacuum lines or hose connections.
- Vacuum lines not clogged.

Test sequence







- Remove rear engine cover (arrows).







- Remove bolts for holding plate for solenoid valves (arrows).
- Lift up holding plate and disconnect vacuum hose from Y-piece of combination valve to be checked.
- Connect e.g. V.A.G 1390 hand vacuum pump to vacuum hose of combination valve to be checked.







- Remove bolts or quick-release screws -1- and -2- and remove front sound insulation.







- Disconnect pressure hose (arrow) at Secondary Air Injection (AIR) pump motor and blow air in with light pressure (do not use pressurized air).
- Both combination valves must be closed, it must not be possible to blow through hose
- Operate hand vacuum pump.
- The relevant combination valve must open, it must not be possible to blow through

If respective combination valve does not open:
- Replace combination valve.

Final procedures
After repair work, the following work steps must be performed in the mentioned sequence:
1. Check DTC memory. Diagnostic Mode 03 - Read DTC Memory
2. If necessary, erase DTC memory. Diagnostic Mode 04 - Erase DTC Memory
3. If DTC memory was erased, generate readiness code.

- End diagnosis and switch ignition off.