Secondary Air Injection (AIR) Pump Motor, Checking

Secondary Air Injection (AIR) Pump Motor, Checking

Recommended special tools and equipment
- VAG1526 multimeter or VAG1715 multimeter
- VAG1594 connector test kit
- Wiring diagram


Test requirements







- Fuses in E-box (in plenum chamber, left) must be OK:
- Motronic Engine Control Module (ECM) Power Supply Relay -J271- -position A3- must be OK, check:
- 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, for example, 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 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). Diagnostic Mode 04 - Erase DTC Memory
- 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 -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 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

- Erase DTC memory of Engine Control Module (ECM). Diagnostic Mode 04 - Erase DTC Memory
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes

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