p1689 no comm from ecm to inj pump.
08-22-2008, 10:48 AM
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p1689 no comm from ecm to inj pump.
hey guys anyone come across po1689? this truck is intermittently cuting out, new transfer pump and filter, wiggled harness, truck running fine now, seems to happen mostly when passing on the highway. i think its the pump module, any info out there
08-22-2008, 07:04 PM
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i got the 1689 when my pump died.
the guy that fixed my truck said the wire that controlled the vp from the ecm was brunt and he had to piggyback it. he new wiring hardness was $800
08-22-2008, 11:51 PM
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A failing Edge EZ or Comp can also cause this code. I found out the hard way (changed VP44). Try to unplug the Edge data port connector, clear the codes and drive for a bit. If that cures it, call Edge....they are very good about fixing the boxes even if out of warrenty.
When my crank sensor was dieing, my tach would drop to zero momentarily, engine would stumble, AC compressor would disengage, and alternator would stop charging. But, mine is a 2000 model and has only crank sensor....I think your truck also uses cam sensor for the engine running signal to the ECM. So, your symptoms may vary a bit.
When my crank sensor was dieing, my tach would drop to zero momentarily, engine would stumble, AC compressor would disengage, and alternator would stop charging. But, mine is a 2000 model and has only crank sensor....I think your truck also uses cam sensor for the engine running signal to the ECM. So, your symptoms may vary a bit.
08-23-2008, 04:55 PM
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I swore Leeboy had a dying IP. Fortunatelly he tried sensor due to cost and he saved a bundle. Good for him. He also had the crank sensor code in addition.Hope you can be so lucky, cause it is normal classic case for early VP44 failure. Look carefully at wiring for damage also. Good luck.
Last edited by dozer12216; 08-23-2008 at 07:39 PM. Reason: add & correct spelling
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08-24-2008, 12:38 PM
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Without you guys and this forum, i would have spent alot of money i didnt have.....Still waiting on my pressure gauge....Just to be sure its up to snuff....You guys Rock! 
10-02-2008, 02:57 PM
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hey i just had this problem.. well i still do as the truck in the shop... i just had the injection pump and lift pump done with the cam senser 2months ago... and i got the p1689 a few weeks ago and it was my injection pump.. so im waiting on warrenty.. it had to do with the electrical in the injection pump... also im in kamloops too
10-02-2008, 07:31 PM
#10
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Hey Bud, take a look at my thread https://www.dieseltruckresource.com/...d.php?t=213458
I changed my Crank case sensor and everything went away.....
I changed my Crank case sensor and everything went away.....
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