Air Injection Pump: Testing and Inspection

Secondary Air Injection (AIR) Pump Motor, Checking

Recommended special tools and equipment
- VA.G 1526 multimeter or V.A.G 1715 multimeter
- V.A.G 1594 connector test kit
- 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 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
- Remove engine cover.







- Disconnect 2-pin connector -1- from Secondary Air Injection (AIR) Pump Motor -V101-
- Disconnect pressure hose 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 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 -J299- (arrow) from relay carrier.

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







- 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

- 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-.