Secondary Air Injection Pump Motor, Checking

Special tools and workshop equipment required 

• Multimeter.
• Wiring diagram.

Test requirements 

• The Secondary Air Injection (AIR) Pump Relay --J299-- OK.
• The Motronic Engine Control Module (ECM) Power Supply Relay -J271- 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 

-- Raise the vehicle..

-- Loosen the quick release fasteners -1- and -2- and remove the noise insulation panel.

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

Checking voltage

-- Crank the engine.

-- Using a Multimeter, check theSecondary 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 Ω 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--. Refer to Secondary Air Injection Pump .

Assembly is performed in the reverse order of removal.

Final procedures 

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

1. Check the DTC memory. Refer to DIAGNOSTIC MODE 03 - READ DTC MEMORY .
2. If necessary, erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .
3. If the DTC memory was erased, generate readiness code. Refer to READINESS CODE .

-- End of diagnosis.