grunthmc

99 3500 6speed
I was out of town and I pulled onto road and the truck stalled. The day before it was loaking but drove fine.
Got Error code 1689 (ECM Comm failure)
Noticed no Fuel pres. Installed new Lift pump and new fuel filter... No fix
Friends shop looked at it and run 12v to Inf Pump pin#7 and Grnd to #6(?). Truck ran for 30min. ECM failure!? ECM replaced but needed programmed.

Dealership tried to program but continous failures (not enough power to ECM).

1 week later no one could figure it out so I had it towed home.
Won't start, no fuel pressure and lift pump does not turn on.
No power to VP44 pin#7, constant 12V on Blue with red tracer (Lift Pump feed). There is 12V to the (2) red/white wires to ECM.
Replaced the fuel system relay but only see 8V at the one side of the relay (coil side). Relay does not switch.

Found that ground from ECM/VP44 wire harness was showing 20 ohms. I repaired a the ground connection to the passenger side battery. Now showing 9 ohms at ECM plug and VP44 plug.

I read "bluechip diesel's" diagnostic page. Made good sense but I could not make heads or tails of my lack of power.


Is there anyone who can make sense of this mess? Truck is dead and life sucks riding the motorcycle in the rain.
Feel free to email me as well grunthmc@gmail.com

j-fox

Here you go.
The dealer can't figure it out!!! Pump is bad.
http://www.bluechipdiesel.com/vp44diagnostichelp.html

grunthmc

J-Fox, Thanks for the reply. That is what I am figuring. Any ideas about the power issues?

j-fox

Call Blue Chip he will help you. I bet the Vp-44 is shot.

RAM2940

I would not condem the injection pump until you get the fuel pump running properly. I think you still have to much resistance(9 ohms) on the ground circuit. Plus you need to get the ecm running properly. I think you have a bad ECM. If you bump the starter the lift pump should run for 25 seconds, if not see if you have power at the lift pump.

grunthmc

The VP44 was not pumping fuel to 1 or 3 but it was pumping to 5 (when I hotwired the #6 and #7 pins on the VP.
I think that the problem is two fold (VP and ECM). The ECM needs to be flashed since it is new out of the box. Once I have a new VP installed I will have the dealer program the ECM and hope that the ECM is bad so that it can be replaced.

I agree with the ECM. I wonder if the dealership can re-program the ECM with the VP out of the truck?!

grunthmc

J-fox,
Thanks! I called Bluechip and they are EVERYTHING that they are cracked up to be!
I ran some tests and the VP was not functioning. I called Chip and placed an (expensive) order for another VP. I hope that it is worth it. Besides, I purchased a $1000 VP 2.5 years ago and look where I am today.
If anyone has VP issues I recommend calling Blue Chip Diesel.