Secondary Air Injection Pump Motor, Checking

Observe all safety precautions: SAFETY PRECAUTIONS 

View clean working conditions: CLEAN WORKING CONDITIONS 

Use only gold-plated terminals when servicing any component with gold-plated electrical harness connector terminals.

For wiring diagrams, component locations, and connector views, refer to the applicable wiring diagram.

Special tools and workshop equipment 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. Refer to PRELIMINARY CHECK .

Start diagnosis 

-- Disconnect the secondary air injection hose.

-- Disconnect the Secondary Air Injection (AIR) Pump Motor --V101-- electrical harness connector -3-.

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.

Specified value: battery voltage.

-- Switch the ignition off.

If the specified value was not obtained:

-- Switch the ignition on

-- 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 2/87 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, 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 Ω Max.

If the specification was not obtained:

-- Check the wiring for a short circuit to Battery (+), or an open circuit.

-- 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--. Refer to the appropriate service information.

-- Erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .

-- Perform a road test to verify repair.

If the DTC does not return:

Generate readiness code. Refer to READINESS CODE .

If the DTC does return and no malfunction is detected in the wiring and the voltage supply was OK:

-- Replace the Motronic Engine Control Module (ECM) -J623-. Refer to the appropriate service information.

Final procedures 

After the 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 .