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
The AIR pump is used to lower tailpipe emissions on start-up. VCM supplies ground to AIR pump relay to energize the AIR solenoid and pump. VCM will run a test using HO2S voltages to diagnose the AIR system. During this test, VCM will activate the AIR pump during "closed-loop" operation. When system is activated, VCM will monitor the HO2S voltages and short term fuel trim values for both engine banks. If AIR system is operating properly, HO2S voltages should go low and short term fuel trim should go high.
VCM checks the HO2S voltages return to above a rich threshold when AIR pump is disabled. If VCM determines that the HO2S voltages for both banks did not respond as expected during tests, DTC P0410 will set. If only one sensor responded, VCM will set either DTC P1415 or P1416 to indicate which bank the AIR system is inoperative.
DTC will set when HO2S voltage is not less than 222 mV for greater than 1.3 seconds or the short term fuel trim value changes to greater than 20 percent when secondary air injection pump is turned on and system is in "closed-loop".
NO RELATED
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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.