Secondary Air Injection (AIR) Pump Motor, Checking

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

Test requirements







- Fuses in E-box (plenum chamber, left) must be OK
- Secondary Air Injection (AIR) Pump Relay -J299- (position A4) 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.
- Ground (GND) connections between engine and chassis must be OK.
- Ignition switched off.

Test sequence







- Disconnect 2-pin connector (arrow) from Secondary Air Injection (AIR) Pump Motor - V101-.
- Remove pressure hose between Secondary Air Injection (AIR) Pump Motor and pressure line at Secondary Air Injection (AIR) Pump Motor.

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







- Connect Secondary Air Injection (AIR) Pump Motor to the B+ and battery Ground (GND) terminals 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), Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 04 - Erase DTC Memory
- Generate readiness code. Readiness Code

If motor starts, and air escapes:
- Disconnect connection between Secondary Air Injection (AIR) Pump Motor and battery.







- Remove Secondary Air Injection (AIR) Pump Relay -J299- from relay carrier, position A4.

NOTE: Do not use metallic tools to pry off relays from relay carrier. The terminals could conduct electricity.







- Check wire between terminal 4b 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 ohm

- Check wire for short circuit to B+ and Ground (GND).
Specified value: infinity ohm
- Check wire between 2-pin connector terminal 1 and Ground (GND) for open circuit according to wiring diagram.

Wire resistance: max. 1.5 ohm

- Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 04 - Erase DTC Memory
- Generate readiness code. Readiness Code

If no malfunctions are found in wires:
- Replace Motronic Engine Control Module (ECM) -J220-.