Air Injection Pump Relay: Testing and Inspection

Secondary Air Injection (AIR) System, Checking

Checking secondary Air Injection (AIR) pump relay -J299-


NOTE: The relay and the fuse for the air pump are located in the E-box in the left side of the plenum chamber


Test requirements
- Fuel pump relay OK
- Fuse for secondary Air Injection (AIR) pump relay -J299- OK
- Ignition switched off

- Remove secondary Air Injection (AIR) pump relay -J299- from relay panel.







- Connect VAG1527B LED voltage tester between terminal 8 (B+) of relay socket and Ground (GND).
- LED voltage tester must light up
- Connect VAG1527B LED voltage tester between terminal 4 (B+) of relay socket and Ground (GND) and operate starter motor.
- LED voltage tester must light up

If LED voltage tester does not light up:
- Repair open circuit according to applicable wiring diagram.

If LED voltage tester lights up:

Checking triggering of secondary Air Injection (AIR) pump relay -J299-
- Switch ignition on.







- Connect VAG1527B LED voltage tester between terminal 8 (B+) of relay socket and Ground.
- LED voltage tester must light up
- Connect VAG1527B LED voltage tester between terminals -6- and -8- of relay socket and/or terminal -6- of relay socket and Ground.
- Conduct "Output Diagnostic Test Mode" (function 03) for secondary Air Injection (AIR) pump relay -J299-.

When secondary Air Injection (AIR) pump relay -J299- is triggered:
- LED voltage tester must light up

If LED voltage tester lights up:
- Replace secondary Air Injection (AIR) pump relay -J299-.

If LED voltage tester stays lit constantly or does not light up at all:
- Connect VAG1598/22 test box to ECM harness connector.

If LED voltage tester stays on brightly:
- Check wiring from terminal -6- of relay socket to test box socket 30 for short circuit to ground.

If LED voltage tester does not light:
- Check wiring from terminal -6- of relay socket to test box socket 30 for open circuit.
- If necessary, repair ground connection or open circuit between terminal -6- of relay socket and test box socket 30.

If wiring is OK:
- Replace Motronic ECM -J220-, create and readiness code.