The PCM will command the check engine light to illuminate and store a DTC if the fault occurs during 2 drive cycles. Common mistakes when diagnosing the P0411 code. If an incorrect oxygen sensor signal is detected the PCM will set a pending code. Finally, an advanced scan tool will be used to monitor air pump operation. The PCM will successfully complete the secondary AIR system monitor if the proper voltage signal is detected from the upstream oxygen sensor. In order for the PCM to enable the secondary AIR system monitor the check engine light has to be commanded off, continuous monitors and the oxygen sensor monitor must have been successfully completed. As with most other monitored OBD II systems all AIR electrical components are checked for electrical and rationality faults during continuous monitoring. If the monitor does not successfully execute on cold start up, the PCM can force the monitor to run during normal idling conditions. all the readiness monitors complete except the secondary air system causing the truck to fail smog in california. my truck is a 2001 Chevy Silverado LS 1500 with a 5.3L v8 and it’s 4×2. any information on this issue would be greatly appreciated. Chevrolet: 2002: Silverado C/K 2500HD (diesel) Failure to set EGR monitor. Possible air injection problem (check valve(s), vacuum line, pump, air passages).
I read the online procedure for a 2001 model. hello gm truck club commuinty i’m having issues with a smog readiness monitor not completing. 2001: Silverado / Tahoe C/K 1500: Failure to set secondary air system monitor. I put another 400 miles on it, and still the same thing. I went in for smog test but it had not completed the emission monitors in the computer. To start with I'm not certain where the location of air pump relay is. (RESOLVED - Click To View) I have a 1999 Chevy Silverado 1500 5.3L. The air pump is not running and it appears there is no power to the pump. The monitor usually runs on the start up of a cold engine, conditions permitting. I have a 2001 chevy Silverado 1500 2wd 4.8 engine that shows a secondary air monitor incomplete.
Keep in mind if the SAP does not clear after a few starts, you should 'CLEAR' the codes again even if there is no SES/CEL/MIL. The PCM uses the signal from the upstream oxygen sensor to detect the presence of extra air in the exhaust manifold supplied by the AIR system. A good car will Clear/Ready/Pass all the monitors after 2 cold start cycles and 15-20 miles of steady highway driving. In order to be classified as a cold start the engine coolant temperature must be below 50☌ (122☏) and within 6☌ (11☏) of the ambient air temperature at startup. This extra air helps heat the catalytic converter quickly when the engine is first started. First you can have it reset with a scan tool.
When vehicles are equipped, the secondary AIR system monitor allows the PCM to ensure that extra air is being delivered to the exhaust system during cold engine operating conditions. OBD II Readiness Monitors OBD Drive Cycles Secondary AIR System Monitor When vehicles are equipped, the secondary AIR system monitor allows the PCM to ensure that extra air is being delivered to the exhaust system during cold engine.
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