Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Secondary Air Injection Pump Motor And Relay, Checking: Notes
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
- Secondary Air Injection (AIR) Pump Relay - J299 - fuses OK.
- Motronic Engine Control Module (ECM) Power Supply Relay - J271- 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 .
The engine MUST be cold (room temperature) in order for the ECM to command the air pump relay ON. The pump runs for approximately 20 seconds. Once the engine has been started, the ECM will not command the pump to run again for approx. 6-8 hrs.
Due to potential damage to the catalyst, the generic scan tool has no provision for SAI relay control
Start diagnosis
-- Remove the Secondary Air Injection (AIR) Pump Relay - J299-. Refer to the appropriate service information.
-- Using a jumper wire, connect Secondary Air Injection (SAI) Pump Relay --J299- - socket 30 to socket 87.
Specified value: The AIR pump should be running.
-- Continue test according to the following table:
-- Remove the Jumper wire.
| Indicated | Test |
|---|---|
| If the pump does Not operate when using a jumper wire at the relay: | IF THE PUMP DOES NOT OPERATE WHEN USING A JUMPER AT THE RELAY |
| If the pump does operate when using a jumper wire at the relay: | IF THE PUMP DOES OPERATE WHEN USING A JUMPER AT THE RELAY |
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.