Secondary Air Injection Pump Motor, Checking

Diagnostic Procedures

Secondary Air Injection Pump Motor, Checking

Special tools, testers and auxiliary items required

• Multimeter (VAG1526) or Multimeter (VAG1715)

• Connector test kit (VAG1594)

• Wiring diagram

Test requirements

• Fuses in E-box (plenum chamber, left) must be OK:





• 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.

• 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).

• 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.

- Generate 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).





• 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

- Check 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

- Erase DTC memory of Engine Control Module (ECM) , Diagnostic mode 4: Reset/erase diagnostic data.

- Generate readiness code.

If no malfunctions are found in wires:

- Replace Motronic Engine Control Module (ECM) (J220) --> [ Engine Control Module, Replacing ] Engine Control Module, Replacing.

Final Procedures

After the repair work, the following work steps must be performed in the following sequence:

1. Check the DTC memory. Refer to --> [ Diagnostic Mode 03 - Read DTC Memory ] Diagnostic Modes 01 - 09.

2. If necessary, erase the DTC memory. Refer to --> [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Modes 01 - 09.

3. If the DTC memory was erased, generate readiness code. Refer to --> [ Readiness Code ] Monitors, Trips, Drive Cycles and Readiness Codes.