If your truck has been throwing a p1345 and or p0014 code these simple steps can help determine if you need to replace the actual CPAS. With my experience in this procedure I had also done an engine flush using Mobile 1 full synthetic 5w30 motor oil, cheap fram oil filter.
My truck had decided to throw the p1345 and p0014 codes after my wonderful husband added engine restorer found in wal-mart. Following my engine flush, these were the steps I took in completely eliminating both codes therefor turning off my SES light without the need to reset it.
Step 1- Disconnect your battery, I should't need pictures or instructions for this step.
Step 2- Remove your Serpentine belt
Step 3- Locate your CPAS(It is directly behind/beside your power steering pump)
Step 4- Disconnect the wiring harness that is connected to your CPAS(You can replace the harness if you would like, I didn't bother doing so as mine was in pretty decent condition)
Step 5- Remove the 3 bolts holding the power steering pump, this will allow you to push the power steering pump down and back without having to remove it entirely. Using a 13mm socket and a ratchet go through the center of the pulley to reach the 3 bolts. There is no need to remove the pulley.
Step 6- Using a 10mm socket, remove the single bolt holding the CPAS in place
Step 7- Twist the CPAS towards you and pull until it comes out. Ease of removal depends on how nasty it is around the seem. Mine took a bit of finesse, Let the oil drain from it before cleaning.
My dirty CPAS
Step 8- Remove the rubber O ring, that way the cleaner won't eat away at it.
Step 9- Using Throttle body/Carb cleaner spray and gently clean the CPAS. I used a toothbrush but BE GENTLE when cleaning the screen, you really don't want to ruin that screen or you will be looking at replacing the entire CPAS. Clean from the area where the O ring is down to the bottom of the CPAS. Again be VERY careful with that screen, I can't stress it enough. You can use a lint/fuzz free towel as well. I used an old shirt. I do not have pictures of me actually cleaning the CPAS...I only have 2 arms You will want to pay close attention to the circles within the screen...that is where the buildup is usually located. Take your time as always and make sure you clean it evenly all the way around.
My Clean CPAS
Reverse the steps to install your newly cleaned CPAS...and DO NOT forget the O ring you took off before cleaning.
*This procedure was done on my 2003 GMC Envoy EXT SLT*
Special Thanks to my Wonderful Husband Mat for doing most of the grunt work, his muscles are much larger than mine and of course to my lovely Phantom for throwing out these codes and teaching both my husband and I that certain products made for vehicles are not made for THIS vehicle. And to everyone here at the NATION! You all have been a huge help, I couldn't be happier being apart of such an amazing community.
And remember with all normal/abnormal vehicle maintenance take your time and be patient. And most of all don't be scared to ask questions, no matter how stupid you may think it is.