Secondary Air Injection (Air) Pump Motor, Checking

Secondary Air Injection (AIR) pump motor, checking

Recommended special tools and equipment
- VAG 1526 multimeter or VAG 1715 multimeter
- VAG 1594 connector test kit
- Wiring diagram

Test requirements






- The respective fuses of Secondary Air Injection (AIR) Pump Motor -V101- must be OK.
- Fuel Pump (FP) Relay -J17- must be OK.
- Secondary Air Injection (AIR) Pump Relay -J299- must be OK.
- Battery voltage must be at least 11.5 volts.
- All electrical consumers like, for example, lights and rear window heating must be switched off.
- Ignition switched off.

Test sequence

- Remove front noise insulation.

- Disconnect 2-pin connector -1- from Secondary Air Injection (AIR) Pump Motor -V101- -2-.

- Disconnect pressure hose (arrow) between Secondary Air Injection (AIR) Pump Motor and connecting line.

Note: To disengage, compress the buttons at the hose coupling.






- Connect Secondary Air Injection (AIR) Pump Motor to the B+ and Ground (GND) terminals of the battery using the respective adapter cables.

The Secondary Air Injection (AIR) Pump Motor must start up and air must escape at compressed-air connection (arrow).

If the motor does not start up, or no air or only very little air escapes:

- Disconnect connection between Secondary Air Injection (AIR) Pump Motor and battery.

- Replace Secondary Air Injection (AIR) Pump Motor -V101-.

- Erase DTC memory of Engine Control Module (ECM).

- Generate readiness code.

If motor starts, and air escapes:

- Disconnect connection between Secondary Air Injection (AIR) Pump Motor and battery.






- Remove securing screws at cover of protective housing for control modules -arrows- and remove cover.






- Remove Secondary Air Injection (AIR) pump relay (arrow) from relay carrier in protective housing for control modules.

Note:
- Remove battery Ground (GND) strap if tools are necessary for removal of relays or control modules from the relay carrier.
- Obtain radio code for radios with anti-theft coding before disconnecting battery.






- Check wire between terminal 2 of relay carrier (arrow) and terminal 2 of 2-pin connector of Secondary Air Injection (AIR) Pump Motor for open circuit according to wiring diagram.

Wire resistance: max: 1.5 Ohms

- Also check the wire for short circuit to B+ and Ground (GND).

Specified value: Infinity Ohms






- Check wire between 2-pin connector terminal 1 and Ground (GND) for open circuit according to wiring diagram.

Wire resistance: max: 1.5 Ohms

If no malfunctions are found in wires:

- Replace Motronic Engine Control Module (ECM) -J220-.