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.
Secondary Air Injection System Monitor (Belt Driven Air Pump System)
The Secondary Air Injection (AIR) system monitor is an on-board strategy designed to monitor the proper function of the secondary air system. The AIR monitor for the belt driven air pump system consists of two Output State Monitor configurations in the Powertrain Control Module (PCM); one circuit monitors the electrical circuit of the Secondary Air Injection Bypass (AIRS) solenoid, the second circuit monitors the electrical circuit of the Secondary Air Injection Diverter (AIRD) solenoid. A functional check is also performed that tests the ability of the AIR system to inject air into the exhaust. The functional check relies upon H02S sensor feedback to determine the presence of air flow. The monitor is enabled during AIR system operation and only after certain base engine conditions are first satisfied. Input is required from the ECT, IAT, and CKP sensor, and the H02S monitor must also have passed without a fault detection to enable the AIR monitor. The AIR monitor is also activated during on demand self-test. The following examples are probable conditions:
- The AIRB solenoid circuit is monitored for open and shorted conditions by the AIRB output state monitor. See Fig 1. The DTCs associated with this test are DTCs P0413 and P0414.
- The AIRD solenoid circuit is monitored for open and shorted conditions by the AIRD Output State Monitor. The DTCs associated with this test are DTCs P0416 and P0417.
- An upstream and downstream functional air flow test is performed during idle, once per engine start-up, and only after all H02S monitor tests have been successfully performed. The flow test relies upon the upstream and downstream H02S to detect the presence of additional air in the exhaust when introduced by the Secondary Air Injection system. The DTCs associated with this test are DTCs P0411 and P1411.
- The Malfunction Indicator Light (MIL) is illuminated after one of the above tests fail on 2 consecutive drive cycles.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.