5.9 ltr 24 valve starts but dies

[Granger T Elfers]

I just bought a 2000 dodge ram 2500 with a 5.9 ltr 24 valve cummins diesel with 170000 miles

The truck starts up, sounds good and then just dies within about 10 seconds. Restart it and it dies again.

Check engine light on so had codes read and had the following:
P0251. Fuel injection pump mechanical failure fuel valve feedback circuit
P1688 internal fuel injection pump controller failure.
P1689 No communication between ecm and injection pump module
P0230 transfer pump circuit out of range

Checked fuses and fuel pump relay under the hood. All good.

Checked all ground wires and electrical connectors.

Checked for fuel leaks and replaced hose clamp between fuel filter canister and injection pump.

Checked fuel pressure from in-tank pump at the filter. About 8 psi when key is turned on and when engine starts. (Pressure slowly drops after engine shuts down)

Replaced in-tank pump with an exact matching pump. Pressure reads 20 psi when keys is turned on and stays at 20 when engine runs briefly before it dies.

Unplugged connector from injection pump and checked for 12 volts on pin 7 with key on
And ground on pin 6 they checked fine. Pin 5 fuel shut off solenoid is supposed to read 0.0 volts until key is turned off at which time it should read 12 volts for 5 seconds. I got a reading of 1.0 volts while engine was running briefly before shutting off.

I dont know what else to try before condemning the injection pump.

Can this be caused by a failing pressure regulator, or cps if this truck even has either of them.

Should i replace the ecm, and pcm before replacing the ip or replace pump first and then see if the ecm and pcm need replaced?

 

[MAYoung]

Knowing as little as I do, it sounds as if the VP-44 injector pump internal electronics have failed. If you have good fuel pressures to the injector pump, the error codes are leading to your source of trouble. I can't really speak as to trouble shooting the Engine Control Module.

 

[DavidC]

https://www.bluechipdiesel.com/troubleshooting-1

 

[DavidC]

I believe this is the test you want. If it starts and idles doing this it is VP time.

No Fuel At Injectors

HOT WIRE TEST - THE "FOR SURE TEST" TO DETERMINE IF THE VP44 IS WHY THE ENGINE WON'T START
It is very rare, but possible, for a problem with the wiring harness or the CAN Bus wires to prevent the engine from starting, so if you want to be 100% sure it IS the Injection Pump causing the no start, follow the following directions exactly, to be sure of not damaging a possibly good pump. This test POSITIVELY eliminates the possibility of overlooking an electrical problem caused by other components that could affect the start or run function of the VP44, as long as you have verified fuel delivery to the Injection Pump. Remove the electrical plug at the back of the Injection Pump and hot wire the pins on the pump as follows. Get two wires long enough to reach from the battery to the VP44. Install an INSULATED ¼ inch female spade connector onto one end of each wire.Use a set of dykes and cut the flat part and one of the "curls" away from each spade connector to leave one "curl" , which will be about the right size to go over the pin on the pump. Connect one INSULATED connector to pin 7 on the pump, which is the pin on the BOTTOM row of the socket on the Injection Pump, closest to the engine, to preferably fused (10 amp is fine) positive battery power in the PDC (Fuse box under the hood), or directly to the positive battery terminal if you like to take risks!.

Connect the other INSULATED connector to the pin directly above the previous connection, the top row of pins, the one closest to the engine, and attach the other end to battery ground. Now try to start the engine and if it doesn’t start, you absolutely positively 100% need an Injection Pump! If the engine starts this way but NOT with the big plug installed on the pump, you know there is something in the harness or CAN bus wiring to the ECM telling or causing the engine to not start. Call me for help if this is the case.

IF YOU HAVE FUEL, POWER AND GROUND, PROVEN BY THE ABOVE TESTS AND STILL HAVE NO START AFTER TEST 3, YOU ABSOLUTELY POSITIVELY NEED AN INJECTION PUMP!