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.
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HOMESERVICE MANUALSHONDA2004S2000 L4-2.2LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTEMISSION CONTROL SYSTEMSAIR INJECTIONAIR INJECTION PUMP RELAYTESTING AND INSPECTION
2004 Honda S2000 L4-2.2L
Air Injection Pump Relay: Testing and Inspection
2004 Honda S2000 L4-2.2LSECTION Testing and Inspection
Air Pump Relay Test
Check for continuity between the terminals according to the table.
- There should be continuity between the A1 and A2 terminals of the air pump relay 2P large connector when power and ground are connected to the B1 and B2 terminals of the air pump relay 2P small connector.
- There should be no continuity between the A1 and A2 terminals when power is disconnect from the air pump 2P small connector.
Check for continuity between the terminals according to the table.
- There should be continuity between the A1 and A2 terminals of the air pump relay 2P large connector when power and ground are connected to the B1 and B2 terminals of the air pump relay 2P small connector.
- There should be no continuity between the A1 and A2 terminals when power is disconnect from the air pump 2P small connector.
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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.