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 (SAI) Pump Relay (-J299-) fuse is OK.

• The Engine Control Module (ECM) Power Supply Relay (J271) and the Fuel Pump Relay (J17) 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 ] Preliminary Check.

Start diagnosis

- Disconnect the secondary air injection hose.

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

Checking voltage

• The engine MUST be at ambient temperature and have at least 8 hours off time for the ECM to operate the Secondary Air Injection (SAI) system. The SAI system may operate for as little as 10 seconds, up to 55 seconds depending on ambient temperature.

- Ignition switch Off.

- Using a multimeter, check the Secondary Air Injection (SAI) Pump Motor (-V101-) electrical harness connector terminal 2 to ground for voltage. When ready, start the engine while monitoring the reading.

- Start the engine.

Specified value: Battery voltage.

- Switch the ignition OFF.

If the specified value was Not obtained:

- Check the wiring connection from the Secondary Air Injection (SAI) Pump Relay (-J299-) socket 2 (relay terminal 87) to the Secondary Air Injection (SAI) 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 or an open fuse. Refer to the wiring diagram.

- If necessary, repair the faulty wiring connection, replace fuse if needed.

If the wiring has no fault, the fuse is not open and voltage is Not present at the pump:

- Perform the Secondary Air Injection (SAI) Pump Relay (-J299-) test.

If the specified value was obtained:

Checking Ground

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

Specified value: 1.5 ohms Max.

If the specified value was Not obtained:

- Check the wiring for an open or high resistance.

- 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 (SAI) Pump Motor (-V101-).

- Erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Modes 01 - 09.

- Perform a road test to verify repair.

Final procedures

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

1. Check the DTC memory. Refer to => [ Diagnostic Mode 03 - Read DTC Memory ] Diagnostic Modes 01 - 09.

2. If necessary, erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Modes 01 - 09.

3. If the DTC memory was erased, generate readiness code. Refer to => [ Readiness Code ] Monitors, Trips, Drive Cycles and Readiness Codes.