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Secondary Air System not Ready or Incomplete: Why However, a wrong voltage signal from the upstream O2 sensor means that the PCM will only have a pending code. The PCM can achieve this because it receives a proper voltage signal from the O2 sensor. The thing is that the PCM will force the check engine light to go off to enforce the monitor’s successful run under normal idling conditions. However, when the engine starts its normal idling, the PCM may compel the monitor to run. However, the PCM may notice that the monitor doesn’t run as it should on a cold start. The secondary air system monitors normally runs as the engine begins its cold start. The PCM often detects that extra air is present in the exhaust system via the signal it receives from the upstream O2 sensor. This way, the engine will respond to the cold start and idle.

Now, as you switch on your car’s cold engine, the extra air from the exhaust manifold helps heat the catalytic converter monitor. It features a combination valve, change-over valve, control relay, engine control unit, secondary air pump, and air filter. The secondary air system is a system that the engine control unit (ECU) controls. However, the module carries this function out under the watchful eye of the secondary air system monitor. The powertrain control module is responsible for sensing that the needed excess air gets to the exhaust manifold. As your car operates under cold engine conditions, it needs extra air in the exhaust system. Secondary Air System not ready: What it Meansįirst off, what does the secondary air system do? It helps reduce the values of hydrocarbon (HC) and carbon monoxide (CO) present in the air injection during cold starts. I also highlight what causes it and the right fixes to apply. Read this article to learn what the secondary air system, not ready means. Yet, there’s no clear indication of what’s wrong. Meanwhile, the cluster panel keeps shows the secondary air system is not ready. The check engine light isn’t illuminating, either. When you scanned, the result still showed no pending code. Even after replacing the air pump, your vehicle may still fail to respond normally.