Air Injection Pump: Testing and Inspection

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







- 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, for example, lights and rear window defroster must be switched off.
- Ignition switched off.

Test sequence

- Remove front noise insulation.







- Disconnect 2-pin connector from motor for secondary air pump (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 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-:
- Vehicles with engine code AEG, AVH, AZG, item 8,
- Vehicles with engine code BDC, item 6.
- 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:
- Vehicles with engine code AEG, AVH, AZG, item 4,
- Vehicles with engine code BDC, Fig. 1.

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.

Continuation for all vehicles







- 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
- Also 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-.