Air Injection Pump Relay: Testing and Inspection

Secondary Air Injection Pump Relay, Checking

Special tools, testers and auxiliary items required

• Multimeter.

• Wiring diagram.

Test requirements

• Secondary Air Injection (SAI) Pump Relay (-J299-)fuses OK.

• 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.

• 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.

Checking voltage

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

- Using a multimeter, check the Secondary Air Injection (SAI) Pump Relay (J299) socket 1 (relay terminal 30) to Ground.

Specified value: Battery voltage.

If the specified value was Not obtained:

- Check the wiring connection from the Secondary Air Injection (SAI) Pump Relay (J299) socket 1 (relay terminal 30) to the Battery positive cable for an open circuit or high resistance. Refer to Wiring Diagrams for pin locations.

- Check the wiring connections for damage, corrosion, loose or broken terminals.

- If necessary, repair the faulty wiring connection.

If the specified value was obtained:

- Using a multimeter, check the resistance of the Secondary Air Injection (SAI) Pump Relay (J299) socket 2 (relay terminal 87) to Secondary Air Injection (SAI) Pump Motor (V101) harness connector, terminal 2.

Specified value: 1.5 ohms Max.

- Switch the ignition OFF.

If the specified value was Not obtained:

- Check the circuit from the Secondary Air Injection (SAI) Pump Relay (J299) socket 2 (relay terminal 87) through fuse in Fuse Box B, out to the Secondary Air Injection (SAI) Pump Motor (V101) connector, terminal 2 for an open circuit or a short circuit to Ground. Refer to Wiring Diagrams for pin locations and fuse ID.

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

- Check the electrical connections for damage, corrosion, loose or broken terminals.

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

If the specified value was obtained:

Checking wiring

- Remove the Engine Control Module (ECM) (J623). Refer to the Repair Information.

- Using a multimeter, check the Secondary Air Injection (SAI) Pump Relay (J299) socket 4 (relay terminal 85) to the Engine Control Module (ECM) (J623) electrical harness connector T94 for resistance. Refer to Wiring Diagrams for pin locations.






Specified value: 1.5 ohms Max.

If the specified value was Not obtained:

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

- 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 the relay voltage supply was OK:

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

- Erase the DTC memory.

- Perform a road test to verify repair.

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 ] 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.