Fass Installed P0230 issue

[Buddman83002]

Had shop install a new FASS pump connected direct to battery for power, they disconnected and removed the block mounted lift pump and left connector dangling. Running great and after 4500 miles the engine light comes on. ECM code P0230 (Transfer Pump (Lift Pump) Circuit Out of Range). Mmmm, truck runs better than ever so-called Fass, the guy I spoke with really had not much help as he insisted nothing to do with the FASS pump so finally got out of him that since the ECM was looking for the original lift pump I guess in the form of resistance it most likely caused the engine light to come on and trigger the code. Then said I may have to put a resistor to complete the circuit on the old connector. Question is does anybody else had the same experience and if so, what value on the resister and Why the ECM picked up on it after 4500 miles??
Any help is appreciated. 2002/2500/4x4/5.9L/110k miles

 

[BoeingDiesel]

I'm guessing that they wired it with key on to activate a relay and pull power off the battery to run the pump? If so, they could have used the factory LP connector to do the same which should eliminate the ECM looking to complete the circuit.

 

[Joe Mc]

Yes, connect to the factory LP connector.

 

[Ozymandias]

But just the switch power for the relay, not the main power to the pump.

What aside is the common way to fit an aftermarket pump, don't know why your shop decided to do a whole new wiring and get ignition hot from somewhere.

 

[mweiman]

I need to check I suppose but the last fass pump I installed on a 2000 did not have the lift pump connector like they used to. Had you wire into the cab fuse box for ignition source to activate relay. I think this may be a recent change.

 

[Buddman83002]

I'm guessing that they wired it with key on to activate a relay and pull power off the battery to run the pump? If so, they could have used the factory LP connector to do the same which should eliminate the ECM looking to complete the circuit.

Yup, this is exactly what they did. This is an authorized Fass Dealer and installer, they pulled off the old block mount lift pump as well as the gas filter and mounted the Fass TS D08 095G Titanium Signature Series Diesel Fuel Lift Pump 95GPH on the driver's side of the tank below the gas door.
The thing that is confusing is why the ECM took 4500 miles before sending an error code. Thanks for the input...

 

[DavidC]

The proper way is to use the factory wiring to energize the coil of a relay, connect a fused wire to the battery to the relay common pole and from the N.O. contact run a wire to the pump.
The relay diode is to prevent spikes going back to the ECM.

 

[BoeingDiesel]

Interesting David, re: the diode relay. I wired mine quite sometime ago with a similar drawing that I think was from you. Is the resistor diode necessary? I didn't include that into mine and no codes. Where would one get such a relay?

 

[petersonj]

IN @DavidC 's schematic there is the element of safety that is included should the truck be involved in an accident that disables the engine. If the engine is forced to stop running with the ignition switch left on, the ECM will shut off the lift pump and reduce the risk of fuel spillage or a fire.

- John

 

[DavidC]

Interesting David, re: the diode relay. I wired mine quite sometime ago with a similar drawing that I think was from you. Is the resistor diode necessary? I didn't include that into mine and no codes. Where would one get such a relay?

The diode limits the flux when the coil is de-energizing which of course can back feed to the ECM electronics and cause havoc if not taking the electronics out. I have not done mine yet (shame on me) but it is also recommended for the factory pump which really should be taken off of the ECM. You do not really need a relay with the built in, you can do as I did and bought a diode assortment from Amazon and add it to the relay, just follow the diagram on polarity. I will use the 4001 or 4007.
https://smile.amazon.com/Switching-...ndustrial&sprefix=diode,industrial,370&sr=1-3

 

[BoeingDiesel]

Thank you David. Am I reading this correctly that you would jump the resistor and diode across pins 85 and 86? If so, even a (electric) numbskull like me can do that.

 

[BoeingDiesel]

Buddman83002, didn't mean to hijack your thread but this is one of the great things about the TDR and affords the reader to learn.

 

[DavidC]

Boeing
Curious , where did you put the relay ?. Yes you are correct on the pins, put another way across the relay coil, just make sure the silver band on the diode is under the wire from the ECM. If installed with the band facing the ground it will be a direct short (known as not good).

 

[BoeingDiesel]

Boeing
Curious , where did you put the relay ?. Yes you are correct on the pins, put another way across the relay coil, just make sure the silver band on the diode is under the wire from the ECM. If installed with the band facing the ground it will be a direct short (known as not good).

The physical location is on the drivers side upper firewall and easily accessible.
thanks gregg

 

[DavidC]

Thanks Gregg