Air Injection Pump: Testing and Inspection

Secondary Air Injection pump motor
Special tools and equipment





^ V.A.G 1551 Scan Tool

Note: The vehicle system tester V.A.G 1552 can be used instead of the V.A.G 1551 Scan Tool, however a print-out is not possible.





^ V.A.G 1551/3 Cable

Checking conditions
^ Fuse for secondary air injection pump relay OK.
^ Suction hose for secondary air injection pump is not blocked or kinked

Checking sequence
- Remove insulation tray.

- Disconnect pressure hose from the secondary air injection pump motor.
- Activate secondary air injection pump relay via Output DTM.
^ Secondary air injection pump motor must run at intervals, and air must exit outlet connections.
If the motor runs, but no air exits:
- Replace secondary air injection pump motor.
If the secondary air injection pump motor does not run at intervals:
- Check activation of secondary air injection pump motor.

Secondary air inlet valve, checking
Checking conditions
^ Engine oil temperature 5 to 33° C
^ Secondary air injection pump motor OK.

Checking sequence





- Disconnect vacuum hose from combination valve (arrow).
- Start engine and run at idling speed. When secondary air injection pump motor starts, vacuum must be felt on vacuum hose.
If no intake manifold vacuum is perceptible:
- Switch engine off.
- Check activation of valve.