VATS security relearn?

I put a rebuilt 5.3 engine into my truck listed above 1500. The PCM in the truck would start truck but ran poorly had codes for mass air flow sensor and MAP sensor. In addition, the voltmeter in truck was reading 9 volts. Had alternator and battery tested they were both good. It was like PCM wasn’t sending signals to alternator and maybe something wrong with signals for mass air flow sensor and map sensor.

I had another PCM for truck so I start relearn process.

Step 1 Turn the key but don’t start security light comes on for 11 minutes and turns off. I turn key off for 5 seconds.


Step 2 turn key and don’t start this is where problem starts security light comes on for a one second and then goes immediately off


Step 3 do procedure final time still same security light comes on for one second and immediately goes of try to start and turns over once and then engine goes off.

I tried the procedure several times and got exactly same results

Could this PCM I put in be bad?


Truck sat awhile while I was rebuilding engine.

What course of action should I take to resolve this?

Thanks for any help.