Not sure that 2hz (what the pump wants) is achievable with the fixed prescalar, I have not tried it. EDIT:your values appear to be under 16bit so it should work.
using TIM3 and modifying anything there adjust ALL pwm output frequencies. There are only two frequencies possible, one for all PWM outputs and one for the Oil pump pwm
I recommend we move the conversation to viewtopic.php?p=82853