With Manufacturer's Scan Tool

Motor for secondary air injection pump, checking





Special tools, equipment, test and inspection devices; required accessories
- VAG 1527 B diode test lamp
- VAG 1594 A auxiliary measuring tool set
- VAG 1598/31 test box

Test condition





- The main fuses must be OK
- The battery voltage must be at least 11.5 V.

Test sequence
- Remove engine cover.
- Remove discharge hose on air pump motor.

Note: Press the buttons on the hose couplings together.

- Remove windshield wiper arms and cowl.





- Connect VAG 1598/31 test box to control unit wiring.
- Switch ignition on.
- Bypass jacks 3 + 46 on test box using auxiliary cables from VAG 1594.
The air pump motor should run and air should be coming out the exhaust nozzles.
If the motor is running, but no air is coming out:
- Switch ignition off.
- Replace air pump motor V101.
If the motor does not start:





- Disconnect 2-pin connector from motor -arrow-.





- Connect VAG 1527B diode test lamp to disconnected attachment plug using auxiliary cables from VAG 1594.
The LED should illuminate.
If the LED illuminates (power supply OK):
- Turn off ignition.
- Replace air pump motor (V101).
If the LED does not illuminate:
- Clip on 2-terminal attachment plug.
- Start control element diagnosis and trigger air pump relay -J299-.
- Check DTC memory.
- Read-out readiness code.
- If fault memory was erased or engine control unit was separated from positive voltage supply, readiness code must be regenerated.