P1689 ERROR CODE - Cause of code Found!

***Mopar1973Man*** · 01-28-2009, 04:14 PM

Well gang...

Mopar1973Man is back out in his shop and found the cause of P1689 error codes.

Quote:

P1689 - No Communication Between ECM and Injection Pump Module Data link circuit failure between ECM and fuel injection pump. Low power, engine derated, or engine stops.

A lot of us assume its the injection pump that causes this which in most cases could be. But I was doing a fuel pressure test (cranking). This requires to pull the fuel system relay out of the PDC box under the hood...

Lower left side labeled fuel pump...

When this relay is missing the VP44 doesn't energize nor pump fuel. It allows you to do the cranking test. But it also sets a P1689 and CEL light. So for all of you that have a P1689 error code present check your fuel pump relay first by trading with another relay!

__________________

Michael Nelson - 2002 Dodge Cummins

For Technical Assistance With Your 24V 2nd Generation Cummins - Click Here! Or Search CF.Com for an Answer

Remember to smack the THANKS! button for those that helped you or you think that post is helpful to others!

rbmchief · 01-28-2009, 04:59 PM

Thanks Mike, that would be awesome if that fixed my issue.

__________________
02 2500 slt 4x4,auto,icebox cai,silencer ring mia, Quad xzt+,jhook, Pinnacle 4" turbo back exhaust,westach elec fuel guage, isspro transtemp,boost,egt guages in pillar, line x in bed, runnin stanadyne. [url]

http://www.cumminsforum.com/forum/wyoming/

rbmchief · 01-28-2009, 05:02 PM

also moved this to the tech forums.

__________________
02 2500 slt 4x4,auto,icebox cai,silencer ring mia, Quad xzt+,jhook, Pinnacle 4" turbo back exhaust,westach elec fuel guage, isspro transtemp,boost,egt guages in pillar, line x in bed, runnin stanadyne. [url]

http://www.cumminsforum.com/forum/wyoming/

***Mopar1973Man*** · 01-31-2009, 12:11 AM

Here is a quick video of the relay and the cranking test for your lift pump that does produce the P1689 error code...

YouTube - P1689 Error code found & Testing Cranking pressure

__________________

Michael Nelson - 2002 Dodge Cummins

For Technical Assistance With Your 24V 2nd Generation Cummins - Click Here! Or Search CF.Com for an Answer

Remember to smack the THANKS! button for those that helped you or you think that post is helpful to others!

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01-28-2009, 04:59 PM	#2 (permalink)
rbmchief Super Moderator Join Date: Jan 2007 Location: casper wy Posts: 3,747 Thanks: 17 Thanked 80 Times in 32 Posts rbmchief's Truck Pics	Thanks Mike, that would be awesome if that fixed my issue. __________________ 02 2500 slt 4x4,auto,icebox cai,silencer ring mia, Quad xzt+,jhook, Pinnacle 4" turbo back exhaust,westach elec fuel guage, isspro transtemp,boost,egt guages in pillar, line x in bed, runnin stanadyne. [url] http://www.cumminsforum.com/forum/wyoming/

01-28-2009, 05:02 PM	#3 (permalink)
rbmchief Super Moderator Join Date: Jan 2007 Location: casper wy Posts: 3,747 Thanks: 17 Thanked 80 Times in 32 Posts rbmchief's Truck Pics	also moved this to the tech forums. __________________ 02 2500 slt 4x4,auto,icebox cai,silencer ring mia, Quad xzt+,jhook, Pinnacle 4" turbo back exhaust,westach elec fuel guage, isspro transtemp,boost,egt guages in pillar, line x in bed, runnin stanadyne. [url] http://www.cumminsforum.com/forum/wyoming/

01-31-2009, 12:11 AM	#4 (permalink)
*Mopar1973Man* www.Mopar1973Man.com Join Date: Feb 2006 Location: New Meadows, Idaho Posts: 10,920 Thanks: 201 Thanked 559 Times in 440 Posts Mopar1973Man's Truck Pics	Here is a quick video of the relay and the cranking test for your lift pump that does produce the P1689 error code... YouTube - P1689 Error code found & Testing Cranking pressure __________________ Michael Nelson - 2002 Dodge Cummins For Technical Assistance With Your 24V 2nd Generation Cummins - Click Here! Or Search CF.Com for an Answer Remember to smack the *THANKS!* button for those that helped you or you think that post is helpful to others!