Williamsauls

So my truck finally ran the secondary air injection test and passed smog! It's funny because I had just scheduled an appointment with a Californian Smog referee to see if they could help diagnosis the issue with the 2A injection. On the way to the appointment the 2A test ran. I've been trying different GM drive cycles for 2 months with no luck. I've drove my truck to work each day, 20 miles, and completed a the standard GM drive cycle with no luck. I guess what the truck needed was a longer drive. The drive to the Smog Referee was approx. 35mile. I guess what I'm trying to say is don't trust the standard GM drive Cycle. Sometime you just need to put some miles on the truck. I read somewhere that if the 2A injection fails it initial test or the test is marginal, then a more elaborate test is conducted. This elaborate test can require a longer drive to finish. This is why sometime the 2A monitor will set as soon as the car starts and other times a drive cycle is required. Matt, In California a The Smog laws have recently changed. You will not be able to pass Smog without completing the secondary air readiness. I would suggest taking the truck for a full drive cycle then putting on some highway miles. What's you normal driving routine? How may miles do you drive each day? If the truck has no codes, you should eventually pass the 2A monitor. I know driving more is not the answer that you want but after trying every option imaginable, driving more ultimately fix my issue.

I have heard that a tech 2 tool can set the monitor to ready. I would like figure this one out without manually setting the monitor. I can't go to the dealer every time I disconnect they battery. I would think there is some underlining cause for the monitor not run its tests. I'm going to try these items tonight 1) Disconnect the battery and ground out the positive cable. 2) Clean the mass air flow sensor. Fingers crossed...

No. My scanner shows secondary air not monitor not ready. I even paid to have the truck emissions tested with the hope they would pass it with one monitor not ready. It did not pass. I now know California requires all monitors to be ready. I recently tried resetting all monitors hopping this would fix the issue. No change, all monitors except secondary ran and passed on the first drive cycle. I'm still having the same issue.

Guys, I need some help with my 2001 5.3l Silverado. I need to smog test my truck but in Caliornia all monitors must be ready to pass. The only monitor that has not completed is the secondary air injection. The truck is not throwing any codes and there are no drivability issues. I've complete every drive cycle I can find numerous times, including the generic GM drive cycle, none have enabled the secondary air injection monitor. I've driven the truck for at least 2 months and put on 1000+ miles since changing the battery which caused my monitors to reset. Each morning I complete a cold start idle for 2.5 minutes hoping the secondary air will run. Below is a list of items I've inspected or changed in an effort to fix my problem. Secondary air pump-I tested its operation at startup. The pump enables at startup and pumps air at an acceptable volume. There are no signs of wear or issues with the pump. Secondary air valve- I tested operation at startup The valve opens and allows air to flow from the pump to the exhaust. There are no signs of wear and all vacuum line were inspected for leaks. Secondary air check valves- Both valves were inspected and replaced due to carbon buildup. Neither were clogged but I still replaced. O2 sensors- I replaced both pre cat O2 sensors because both had 100,000+ miles. The O2 sensors have been monitored using a scan tool and no signs of issue have been noted. I've monitored both pre cat O2 sensors during startup and I can see when the secondary air pump is enabled. Both sensors go lean until the pump is deactivated and closed loop is achieved. I've monitored engine coolant temp, intake air temp and ambient air temp with my scan tool to ensure all sensors are allowing for a cold start. Again the truck runs great and has no pending or stored codes. It just will not run the secondary air injection test. I'm no slouch when it comes to wrenching on cars but this one has me stumped! What would be my next option? Does anyone know what sensors are monitored to enable the secondary air injection monitor? Thanks for the Help.