Jump to content
  • Welcome To Mopar1973Man.Com

    We can see you lurking about Mopar1973Man.Com reading articles and reading other member's posts. Are you trying to solve a problem with your Dodge / Ram Turbo Diesel Cummins? We have lots of helpful members and staff on the Mopar1973Man.Com and are willing to give guidance on how to fix or improve your truck. You know when you see good valued information here on Mopar1973Man.Com. We are not corporate owned like many of the other websites out there. Like Cummins Forum (VerticalScope Inc.). Mopar1973Man.Com is entirely privately owned and operated since 2004. Your subscription funds goes towards server maintenance and software maintenance. We happen to be one of the most friendliest and helpful websites for Cummins Owners in the world. Come join us and register and then pick a subscription plan

     

Recommended Posts

I have a 2000 3500 5 speed. New built engine. Currently getting about 9 volts to fuel relay. Truck started and ran upon engine install but oil change place arced alternator on oil filter. Injector pump was fried, so I replaced. Traced back to computer. Sent off twice and got same result. Installed computer on another truck, same result, have to jump pins for relay to start engine. Sent off to Auto computer specialist this time, same result. Fass comes on and works fine but injector pump won't create pressure while this relay is getting low voltage. Please help. I have used this site for testing wires and can only come up with computer failure but after repairing 3 times now with two companies, I'm at a loss.

Link to post
Share on other sites

I wish I could help with this! Hopefully someone will come along with a short list of items to check.

 

My guess out of left field is that there's a bad wire splice, corrosion, etc. somewhere upstream of the relay.

 

Or, the proverbial bad ground.

  • Thanks 1
Link to post
Share on other sites
  • Administrator

image.png

 

If you look there is only a fuse in between the fuel relay and the VP44. Which is the same fuse that powers the ECM, PCM and VP44 all share the same power source. (Red/white) Then the (brown/white) is the trigger to the relay. So my suggesting is change the #3 fuse in the PDC and then change the relay. 

  • Like 1
Link to post
Share on other sites

Camocoaltrain,

 

Please show the method and the device of "how you are measuring" this DC voltage. 

Allow us to see your analytical procedure...photos of your connections to your DC multi meter and the display. Let us see how you connect your probes.

 

 

  • Like 1
  • Thanks 1
Link to post
Share on other sites

Where did you measure the 9 volts at the relay?  Was that the red wire (connection #30), at the red/lt green wire (#87), or somewhere else?  What did you use for a ground when measure the voltage?

 

Did you measure the voltage of the brown/white wire (#86)?  If you aren't getting 12V at #86, it may not be enough juice to consistently operate the relay.  If your G102 ground was bad, I would imagine you'd be having other problems, too.  That's the ground for (#85) the relay.

If (#86) doesn't have 12V or more, does (#36) coming out of the ECM?  I imagine it does if you've sent off the computer that many times!  But, that wire may have a corroded connector, or bad spot in the wire.

Link to post
Share on other sites

 

 

On 5/10/2021 at 1:57 PM, W-T said:

 

I too was wondering where @Camocoaltrain was in the fray of this topic.

 

Also, @Dieselfuture thank you for the acknowledgement...my dismal record of activity due to circumstances will improve slightly and my recent absence from the site was a technical error that has just been corrected with the assistance of @Mopar1973Man...hence, I will be here to annoy the participants with zealous intent in the pursuit of technical excellence regarding the CTD platforms.

 

Cheers   

Good to have you back. With your help I made the gremlins leave me alone for a good while now.

  • Thanks 1
Link to post
Share on other sites

Hey @dripley...thanks, it's gratifying to know efforts are awarded in simple ways...I feel successful when others have achieved results from helpful hints.

 

Now if @Camocoaltrainwould chime back in with his findings perhaps an answer could be discovered and assist him in this task. 

  • Like 1
Link to post
Share on other sites
×
×
  • Create New...