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Hello and welcome back,
I will try to assist you here. Actually this sounds like it could be a fuel issue here. Given the past history on all of these vehicles, It is VERY common for the fuel pump to be the fault. We have replaced literally hundreds of these with the exact same symptoms that you have described. It has an electric pump in the gas tank and it spins real fast to make the required pressure. After they get old they start spinning slower sometimes and then not at other times, then it starts acting up just like this. Do you know if and when the pump has ever been replaced?
How many miles are on it?
Thanks, XXXXX XXXXX with the delay.
If you can get a can of carb cleaner spray and spray a shot into the air intake hose to the engine when it won't start or when it dies, if it runs on that, then by all means replace the pump. I can't even begin to count how many fuel pumps we have replaced on this type vehicle that have the same exact symptoms you are having...as far as the codes, yes it will not set a code for the fuel pump and the code you are seeing now has to do with when you did the relearn. My money is on the fuel pump being the trouble causer here.
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Was it in a no-start condition when tested?
Will it start and run for a couple seconds if you spray an alternative fuel (like carb cleaner spray) into the air intake to the engine?
Get a noid light from a parts store and unplug one of the injectors and plug the light into the connector and see if it flashes when trying to start it. This will tell you if the injectors are being triggered to open and close.
Good spark at the spark plugs at the time of a no-start?
I would have to agree. Below is the trouble tree for that code. Keep in mind when it says "does engine crank" it refers to does the starter engage. NOT "does the engine start".
I commend you for your determination!