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
Secondary Air Injection (AIR) system is used to lower tailpipe emissions during start up. PCM supplies ground to AIR pump relay, energizing pump.
PCM runs 2 tests using HO2S voltages to diagnose AIR system. Tests consist of:
- Test I
PCM monitors HO2S voltages when AIR pump is enabled. If HO2S voltage drops to a predetermined range, PCM assumes that AIR pump is operational. If HO2S voltage increases to a predetermined range, PCM assumes that AIR pump is disabled. If HO2S voltages are out of range or inconclusive, diagnostic will proceed to next test. - Test II
During this test, PCM will activate AIR pump during "closed loop" operation. When AIR is activated, PCM will monitor HO2S voltages and short term trim values for both banks of engine. If PCM determines that HO2S voltages for both banks does not respond as expected during tests, DTC P0410 will set. If only one sensor responded, PCM will set either a DTC P1415 or P1416 to indicate which bank AIR system is inoperative.
DTC will set when the following conditions are present:
TEST I
- DTCs P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0171, P0172, P0174, P0175, P0300, P0401, P0404, P0405, P0412, P0418, P0441, P0443, P0506, P0507, P1120, P1220, P1221, P1404, P1441 or any HO2S DTCs not set.
- Engine operating greater than 2 seconds.
- TP sensor angle not moving greater than one percent.
- Engine load less than 25 percent.
- Engine airflow less than 30 gm/s.
- Ignition voltage greater than 11.7 volts.
- Air fuel ratio greater than 13:1.
- ECT less than 228°F (109°C).
- HO2S voltage drops to less than 400 mV.
TEST II
- DTCs P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0171, P0172, P0174, P0175, P0300, P0401, P0404, P0405, P0412, P0418, P0441, P0443, P0506, P0507, P1120, P1220, P1221, P1404, P1441 or any HO2S DTCs not set.
- Engine operating greater than 200 seconds.
- Engine speed greater than 600 RPM.
- Engine airflow less than 22 gm/s.
- Ignition voltage greater than 11.7 volts.
- ECT greater than 158°F (70°C).
- IAT greater than 50°F (10°C).
- Engine load less than 25 percent.
- HO2S voltage does not drop to less than 222 mV within 1.5 seconds.
- Short term fuel trim does not go above a predetermined amount.
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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.