Air Injection Pump: Testing and Inspection

Secondary Air Injection (AIR) Pump Motor, Checking

Recommended special tools and equipment
- V.A.G 1526 multimeter or V.A.G 1715 multimeter
- V.A.G 1594 connector test kit
- Wiring diagram

Requirements







- Main fuses must be OK.
- Fuel Pump (FP) relay -J17- must be OK, check
- Secondary Air Injection (AIR) pump relay -J299- must be OK, check
- Battery voltage must be at least 11.5 volts.
- All electrical consumers such as, lights and rear window defroster must be switched off.
- Ignition switched off.

Work sequence
- Remove front sound insulation.







- Disconnect 2-pin connector from Secondary Air Injection (AIR) pump motor (arrow).







- Disconnect pressure hose at Secondary Air Injection (AIR) pump motor (arrow).

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 battery using 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). Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 4: Reset/Erase Diagnostic Data
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes

If motor starts, and air escapes:
- Disconnect connection between Secondary Air Injection (AIR) pump motor and battery.
- Remove Secondary Air Injection (AIR) pump relay from relay carrier in protective housing for control modules.

NOTE:
- Remove battery Ground (GND) strap beforehand 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 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

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

Specified value: Infinite 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-.