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.
Circuit Description
A fused ignition voltage is supplied to AIR relay. VCM controls AIR pump by grounding AIR relay control circuit which energizes relay and supplies voltage to AIR pump clutch. When fuel system goes to closed loop, VCM opens ground to AIR control circuit.
DTC will set when the following conditions are present:
AIR Passive Test Enable
- No ECT, EVAP, HO2S, IAT, MAF, MAP or TP sensor DTCs set.
- No misfire DTCs are set.
- No fuel trim DTCs are set.
- System voltage greater than 10 volts for greater than 3 seconds.
- IAT greater than 32°F (0°C).
- Engine run time greater than 3 seconds.
AIR Active Test Enable
- AIR passive test failed.
- No EVAP, HO2S IAC, IAT, MAF, MAP or TP DTCs are set.
- No misfire DTCs are set.
- No fuel trim DTCs are set.
- Power enrichment not active.
- Decel fuel cut-off not active.
- Air/Fuel ratio at 14.7:1.
- Engine speed is greater than or equal to 550 RPM.
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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.