Secondary Air Injection (Air) Pump Motor V101, Checking

Secondary Air Injection (AIR) Pump Motor V101 , checking

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

Test requirements
- The Secondary Air Injection (AIR) Pump Relay J299 fuses OK.
- The Power Supply Relay (terminal 30, B+) J317 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.

Start diagnosis

- Disconnect the secondary air injection hose -arrow-.






- Disconnect the Secondary Air Injection (AIR) Pump Motor V101 electrical harness connector - 1 -.

Checking voltage

- Start engine momentarily.






- 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 2 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, loose 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, loose or broken terminals.

- If necessary, repair the faulty wiring connection.

If no malfunction is found in the wiring and voltage supply was OK:

- Replace Secondary Air Injection (AIR) Pump Motor V101.

- Assembly is performed in the reverse of the removal.

Final procedures

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

1. Check the DTC memory.
2. If necessary, erase the DTC memory.
3. If the DTC memory was erased, generate readiness code.

End of diagnosis.