Air Injection Pump: Testing and Inspection

Secondary air system pump motor, checking
Special tools, workshop equipment, testers, measuring instruments and auxiliary items required





^ V.A.G 1551 scan tool

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





^ V.A.G 1551/3 Cable

Check conditions





^ Fuse for secondary air pump relay (J299)-arrow-located in the main fuse box on the battery is OK.
^ No DTCs must be stored in DTC memory.
^ The battery voltage must be at least 11.5 V.
^ The suction hose for secondary air pump is not blocked or kinked

Test sequence
^ Remove engine cover.
^ Detach the pressure hose from the secondary air pump motor.

Note: To release, press together the buttons on the hose coupling.

^ Activate the secondary air pump relay via the Output Diagnostic Test Mode (DTM).
^ The secondary air pump motor must run at intervals, and air must exit the outlet connections.
If the motor runs, but no air exits:
^ Proceed with Output Diagnostic Test Mode (DTM) until completed.
^ Press keys O and 6 for the function "End output" and confirm entry with the Q key.
^ Switch off ignition.
^ Replace secondary air pump motor.
^ Check DTC memory.
^ Read out readiness code.
^ If the DTC memory has been erased or the engine control module separated from the permanent positive, the readiness code must be generated again.
If the secondary air pump motor does not run at intervals:
^ Check activation of secondary air pump motor.