Vacuum pump issue?

[Mopar]

I recently did a new bumper and had to relocate the vacuum pump. Relocated it to near the PCM.

I cut the electric lines at the pump and extended them. All connections are good and I ran 12v directly to the pump and it runs and I verified it pulls full vacuum. So the pump and check valves are all in place and working.

I turned the key to run but didn't start it and then pumped the brake pedal a few times. It ran out of vacuum assist but the pump never came on.

I tried disconnecting the sensor at the brake booster to force it to “see” low vacuum and it still never came on.

Otherwise, in normal driving the brakes work fine and no check engine lights. Any thoughts?

I am not the original owner (3 prior) so I don’t know exactly what mods have been done. I haven’t started using JScan yet but is it possible someone turned off the vacuum pump using JScan?

 

[Mopar]

Hello anyone on this forum??

 

[JeepJeezy]

Did you have vacuum assistance the whole time with just key on before the move? Honestly, now I'll have to check if I do without the motor running and just the key on.

 

[Mopar]

Did you have vacuum assistance the whole time with just key on before the move? Honestly, now I'll have to check if I do without the motor running and just the key on.

I don’t know. I assumed everything worked before I relocated it. Everything was working fine before I relocated it and it’s all working fine now in normal operation. But, I can’t seem to get the pump to turn on unless I connect power directly to the pump plug. Then, it works fine. So, I am confident my connections are good.

My brakes work fine for normal driving. Been working through some lift issues from the previous owner so haven’t been able to really off road it at all. But, that’s coming. Been ordering parts as I find issues.