p0628

[mulutchoker]

my truck seems to run fine,mabey a little ruff at idle but it throws a p-0628 code. cant seem to find anything on line to help,just want to address it before the truck shows me what to do.THANKS,AJ

 

[p-Bar]

Code is for low voltage at lift pump. Can you tell us what year truck?

 

[DavidC]

Is that a true 440 six pack ?.

 

[mulutchoker]

Code is for low voltage at lift pump. Can you tell us what year truck?

early 2004

 

[p-Bar]

Ok if the lift pump has never been updated to intank then it should be mounted on the back of the filter housing.. It's probably bad. How many miles on the truck?

 

[mulutchoker]

Is that a true 440 six pack ?.

NO its a 520 ci RB with a 1050 dommy runs mid 10,s at 4,129 lbs (with my big carcass in the seat) its a street car.

Ok if the lift pump has never been updated to intank then it should be mounted on the back of the filter housing.. It's probably bad. How many miles on the truck?

129,000 i just put a brand new lift pump on it.mabey i should start back tracing wires,i assume it should have full charge vlts to the pump?

 

[mulutchoker]

NO its a 520 ci RB with a 1050 dommy runs mid 10,s at 4,129 lbs (with my big carcass in the seat) its a street car.

129,000 i just put a brand new lift pump on it.mabey i should start back tracing wires,i assume it should have full charge vlts to the pump?

also i cant seem to find a fuel pump specific fuse in the box.

 

[DavidC]

If it is like the 2nd gen there is no factory fuse. The pump runs through the ECM.

 

[mulutchoker]

If it is like the 2nd gen there is no factory fuse. The pump runs through the ECM.

could this mean there is a prob with the ECM.If i can trace the fuel pump wires back to the ECM mabey there is a bad wire?

 

[DavidC]

could this mean there is a prob with the ECM.If i can trace the fuel pump wires back to the ECM mabey there is a bad wire?

It is possible. Some 2nd gen guys installed a relay that the coil wired with the pump wires to energize then installed a seperate fused 12vdc from the battery to the contacts on the relay then to the pump. This took the load off of the ECM.