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.
Air Injection: Description
This vehicle is equipped with an air pump that injects air into the exhaust to reduce the emissions during engine warm up. The air injected into the exhaust will cause the catalytic converters to heat up more quickly. This will improve the emission levels during a cold start. The air pump switchover system incorporates an air pump (4) with two air pump switchover valves (1 and 6), an air pump switchover solenoid (3), an air-pump relay, a vacuum check valve (5) and the PCM.
The air pump relay is located in the relay control module and can be easily identified by referring to the relay control module label. The air pump is mounted to the top center of the engine timing cover. The air pump switchover valves (1 and 6) are located at the front, top of the engine, mounted just in front of the left and right cylinder covers. The air pump switchover solenoid (3) is mounted on the right front of the engine, just below the air pump switchover valve RH (6).
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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.
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