With Generic Scan Tool

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 set
- Wiring diagram

Test requirements





- The respective fuses of Secondary Air Injection (AIR) Pump Motor -V101- 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 like, for example, lights and rear window heating must be switched off.
- Ignition switched off.

Test sequence
- Remove front noise insulation.






- Disconnect 2-pin connector -1- from Secondary Air Injection (AIR) Pump Motor -V101- -2-.
- Disconnect pressure hose (arrow) between Secondary Air Injection (AIR) Pump Motor -V101- and connecting line.

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- Service and Repair
- Erase DTC memory of Engine Control Module (ECM), 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 securing screws at cover of protective housing for control modules -arrows-and remove cover.






- Remove Secondary Air Injection (AIR) pump relay (arrow) from relay carrier in protective housing for control modules.

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.






- Check wire between terminal 2 of relay carrier (arrow) 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+ or 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

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