Secondary Air Injection Pump Motor, Checking

Secondary Air Injection Pump Motor, Checking

Special tools, testers and auxiliary items required
- Multimeter.
- Wiring diagram.

Test requirements
- The Secondary Air Injection (AIR) Pump Relay -J299- fuses OK.
- The Motronic Engine Control Module (ECM) Power Supply Relay J271 fuse OK.
- Battery voltage at least 12.5 V.
- All electrical consumers switched off (radiator fan must NOT run during test).
- A/C switched off.
- The ignition switched off.

Test procedure
- Perform a preliminary check to verify the customers complaint. General Diagnosis

Start diagnosis
- Raise the vehicle.
- Loosen the quick release fasteners - 1 -.







- Remove the screws - 2 - and the noise insulation panel.







- Disconnect the Secondary Air Injection (AIR) Pump Motor -V101- electrical harness connector - 5 -.

Checking voltage
- Crank the engine.







- Using a Multimeter , check the Secondary Air Injection (AIR) Pump Motor -V101- electrical harness connector terminals 1 to 2 for voltage.
- Switch the ignition off.

Specified value: battery voltage.

If the specified value was not obtained:







- Using a Multimeter , check the Secondary Air Injection (AIR) Pump Motor -V101- electrical harness connector terminal 2 to Ground (GND).

Specified value: battery voltage.

If the specified value was not obtained:
- Check the wiring connection from the Secondary Air Injection (AIR) Pump Relay -J299- socket 8/87 to the Secondary Air Injection (AIR) Pump Motor -V101- electrical harness connector terminal 2 for an open circuit or a short circuit.
- Check the wiring connections for damage, corrosion, lose or broken terminals.
- If necessary, repair the faulty wiring connection.

If the specified value was obtained:

Checking Ground (GND)







- Using a Multimeter , check the Secondary Air Injection (AIR) Pump Motor -V101- electrical harness connector terminal 1 to Ground (GND) for resistance.

Specified value: 1.5 Ohms Max.

If the specification was not obtained:
- Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).
- Check the electrical harness connector for damage, corrosion, lose or broken terminals.
- If necessary, repair the faulty wiring connection.

If no malfunction is found in the wiring and voltage supply was OK:
- Replace the Secondary Air Injection (AIR) Pump Motor -V101-.

Final procedures
After repair work, the following work steps must be performed in the following sequence:
1. Check the DTC memory. Diagnostic Mode 03 - Read DTC Memory
2. If necessary, erase the DTC memory. Diagnostic Mode 04 - Erase DTC Memory
3. If the DTC memory was erased, generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes

- End of diagnosis.