Jump to content
  • Welcome To Mopar1973Man.Com

    We can see that your guest and been lurking about. When you register on the Mopar1973Man.Com site you'll be able to interact with all the other members. This is the most friendliest Cummins forum you'll ever join. Take the time right now and  REGISTER  on the Mopar1973Man.Com this will open up many more options and functions on the website. Everyone is very friendly and helpful just ask questions and everyone will help you out the best they can. 

Sign in to follow this  
dave110

Another 1689 dtc question

Recommended Posts

Hello. I was wondering if anybody can answer me this one just to satisfy my curiosity. Theres a guy over on CF who's Raptor 100 quit due to dirt in the gears. He got a P0230 which makes sense and also a p1689 code. How can lift pump trouble cause a 1689? The last time I got one the VP was done. What really baffles me is he said once the lift pump was fixed it cleared all the codes. What am I missing?

Share this post


Link to post
Share on other sites

Here is the diagnostics for the P1689 code... http://articles.mopar1973man.com/2nd-generation-24v-dodge-cummins/59-obdii-error-codes/228-p1689-no-communication-between-ecm-and-vp44 But typically the fuel flow stops or slows to point he the pressure falls below 14 PSI the overflow valve starts closing and the cooling fuel disappears so now the computer on the VP44 (FPCM Fuel Pump Control Module) start losing its cooling fuel and the electronics starting getting hot. Yes. I know there is a P0168 code for over temp but in all these years I've never seen 1 report of it. http://articles.mopar1973man.com/2nd-generation-24v-dodge-cummins/59-obdii-error-codes/155-p0168-decreased-engine-performance-due-to-high-injection-pump-fuel-temperature I consider the P0168 code worthless because you'll never see it. :rolleyes:

Share this post


Link to post
Share on other sites

Thanks,I knew I could get an answer here!. So bad LP/no fuel flow could overheat the IP, stop it from working until it cools down, and set the code, and then be OK again after fuel flow is restored?

Share this post


Link to post
Share on other sites

Maybe or maybe not... Depends on how hot the electronics might of gotten. It might be other things too.

[h=2]Possible Causes[/h]

[*] Wiring & Connectors

[*] Fuel Injection Pump Relay Output Circuit Open

[*] Ground Circuit Open Or High Resistance

[*] Datalink (+) Circuit Open

[*] Datalink (+) Circuit Shorted To Ground

[*] Datalink (-) Open

[*] Datalink (-) Shorted To Ground

[*] ECM

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

  • Donation Goals

    Mopar1973Man Medical Bills

    If you want to donate to Michael Nelson medical bills. Any fund donated here will be directed toward the medical bills and getting them paid. 


    30%
    $150.00 of $500.00 Donate Now


×
×
  • Create New...