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 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.

Procedure







- Disconnect the secondary air injection hose - arrow -.







- Remove the sound insulator quick-release fasteners - 1 - , and screws - 2 -.







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

Checking voltage
- Switch the ignition on.







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







- Install the sound insulator quick-release fasteners - 1 - , and screws - 2 -.







- Connect the secondary air injection hose - arrow -.

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.

- End of diagnosis.