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-) and fuse SB-32 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. Once activated, it will need a complete shutdown cycle again before it will initiate. 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) through fuse SB-32 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.