With Generic Scan Tool
Combination Valve, Checking
Recommended special tools and equipment
- VAG1390 Hand vacuum pump
Requirements
- Pressure hose for Secondary Air Injection (AIR) pump motor not clogged or kinked
- No leaks in vacuum lines or hose connections.
- Vacuum lines are not blocked or kinked (vehicles with engine code AEG).
Work sequence (vehicles with engine code AEG)
NOTE: Do not use pressurized air for the following test.
- Remove front sound insulation.
- Disconnect vacuum hose -1- from combination valve at Secondary Air Injection (AIR) solenoid valve -N112- -2-.
- Connect hand vacuum pump (V.A.G 1390) at vacuum hose -1- to combination valve.
- Disconnect pressure hose at Secondary Air Injection (AIR) pump motor (arrow) and blow into it with light pressure.
Combination valve must close.
NOTE: To disengage, compress the buttons at the hose coupling.
- Operate vacuum pump.
Combination valve must open.
If the combination valve does not open or it is constantly open:
- Replace combination valve.
- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 4: Reset/Erase Diagnostic Data
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes.
Work sequence (vehicles with engine code AVH, AZG, BEV, BBW)
NOTE: Do not use pressurized air for the following test.
- Remove front sound insulation.
- Disconnect pressure hose (arrow) from Secondary Air Injection (AIR) pump motor.
NOTE: To disengage, compress the buttons at the hose coupling.
- Blow with light pressure into pressure hose to combination valve
Combination valve must close.
- Blow with high pressure into pressure hose to combination valve
Combination valve must open.
If the combination valve does not open or it is constantly open:
- Replace combination valve.
- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 4: Reset/Erase Diagnostic Data
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes.