CRT

Hello I am John Cope and I was referred here from a MoparStyle.com member.I have a 1998 Diesel-24 valve with a no start condition. I have 15 psi befor and after the fuel filter but no fuel at the injectors.<br>I ran codes and found:<br>P0234 Turbo boost limit exceded<br>P0251 Vp44 Fuel Valve feedback<br>P1689 no com between ECM &amp; inj. pump<br>P0230 Transfer pump ckt out of range<br>P0113 intake air temp sensor volts high<br>P0237 Map sensor volts too low <br><br>Then I cleared the codes and have :<br><br>P1689 No com between ECM &amp; Inj pump<br>P1693 DTC detected in ECM<br><br>All realys and fuses are good.I need diagnostics flow chart so i can pin point the no communication from the ECM to the INJ. Pump.Lift pump is new.<br><br>

Shovelhead

Are you running a &quot;Performance Enhancing&quot; box that pierces the pump wire?<br>If so how long since it was installed?<br><br>Ed

CRT

NO Performance Enhancing&quot; box my truck is bone stock

DF5152

maybe the ECM went bad?

Shovelhead

The early 24 Valve VP injection pumps have earned a reputation for croaking at an early age.
It sounds like yours could be one of them.
How many miles on your truck?
The VP is covered under Cummins 100,000 mile warranty.

There is a test procedure for checking to see if the VP has croaked.
I'll try to locate it and post.
It involves providing power and ground to two of the pins on the pump, to see if it will run at idle.


Ed.

CRT

Ya , that could be. But I need a diagnostics flow chart so I know that the ECM is good or bad. I was a Dodge tech for 12 years . I dont have any Powertrain Diagnostic book anymore. :'(

Shovelhead

Injection Pump Testing Thread

If it starts, the pump is good.
Then the ECM must be the problem.
I assume (geeze I hate that word) that you have already double checked all wiring connections.


Ed

CRT

Yepper ED , I checked all wiring and pins. Thanks for the link. I am doing the test today. ;D

MCummings

CRT,

What did you find out.

I had all the same codes you have.

Plus I have P1475, Aux. 5 Volt sensor voltage too high.

I've cleared the codes,, now I have no codes, but the truck still behaves exactly like it has a P1689 (no comm.)

I'm beginning to think it's my wiring harness....

Merrick

J BODY

What would come in handy for you guys is the Cummins "jump box" that the dealers have. You unplug the VP 44 connector and attach the test box. If you have a no start with the test box you need to diag the pump. If it starts with the box the wiring and ECM need investigating.

dieselgeek

You have a LOT of codes that seem random... the only correlation I can gather, and a COMMON problem, is that you have a grounding problem with the ECM. My truck being as old as it is, I'm starting to see flaky electronics issues... I'm told by a resident expert that many of these problems are from contacts going bad in various wiring locations. Grounds are especialyl susceptible - I'd find the ground pin on the ECM harness and see if it's actually getting to ground...

chouchins

The 5 volt power source is the ECM. The communications bus from inj. pump to ECM is just a pair of twisted wires which is probably not a problem unless corrosion or connector problem at pump or ECM. I checked the drawing for 2001 pin 1&2 at inj. pump go to 23 &13 of ECM. But you really need to do as others have stated and put +12 volt pwr. on pin 7 and grd. on pin 8 of injection pump and see if the truck will start and idle. Hope this helps