No start, 24v code 1689
05-18-2006, 06:20 PM
#1
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No start, 24v code 1689
Im new to this, this has been happing to me many times, i have a 1999 24v diesel which seems to be getting no fuel. I have a fuel gage when i got it and i always had 10 psi. Once i get it going it runs fine, there is no power loss, pulling a trailer. i was wondering can a inj pump go bad ever with always good psi. I get a code 1689, i know what it means, i cleaned all the connections, is it a senor, i have no rpm drop, just when i try and start it, its not getting fuel. I checked for air in the lines and no drips of fuel. This is my question, can a truck run perfect once i get it started, with a shot inj pump. Just like last night would not start, it sat all night, and in the morning for some reason it started. thank you
Brian Govednik
Brian Govednik
Last edited by bgovednik; 05-18-2006 at 06:22 PM. Reason: spelling
05-18-2006, 08:25 PM
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What is your fuel pressure at wide open thortel?
When cleaning the connections. Did you clean all the ground connections including the batterys?
Try replacing the rubber fuel line between the injector pump and fuel filter with clear tubing. When the truck is running look for air bubbles running though the clear tubing.
The next time it sits over night and don't want to start try bleeding the injectors.
Rodney
When cleaning the connections. Did you clean all the ground connections including the batterys?
Try replacing the rubber fuel line between the injector pump and fuel filter with clear tubing. When the truck is running look for air bubbles running though the clear tubing.
The next time it sits over night and don't want to start try bleeding the injectors.
Rodney
05-18-2006, 09:16 PM
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thanks
open up, its drop down to 7 psi, i will try that suggestion with the clear line, i been reading alot of other threads, i think is mostly air is getting into the lines. Any other suggestion or tests about checking all the fuel lines and the tank. Due the metal fuel lines ever get pin holes in them or mostly the rubber lines do.
thanks
Brian
thanks
Brian
05-18-2006, 09:51 PM
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The rubber lines will git small holes that want leak fuel, but will let air in. Also the fitting at the tank will start letting air into the line.
I have heard of the return line letting air into the injector pump when parked overnight. The push fitting at the rear of the engine not sealing.
If the clear tubing shows no air bubbles. When it want start, try cracking the injector lines on 1,3 and 4 on the head. Then turn the on key and bump the starter to cycle the lift pump 3 or 4 times then try starting. A second person is needed doing this. When fuel starts shouting out around the line tighten that line, it should start. If this works look for a air leak in the return line.
You can also flow test the lift pump. While you have the rubber lone off between the IP and filter, run a hose into a empty container. Bump the starter it should pump 1 1/4 quarts.
7 psi sounds low for a stock engine.
I have heard of the return line letting air into the injector pump when parked overnight. The push fitting at the rear of the engine not sealing.
If the clear tubing shows no air bubbles. When it want start, try cracking the injector lines on 1,3 and 4 on the head. Then turn the on key and bump the starter to cycle the lift pump 3 or 4 times then try starting. A second person is needed doing this. When fuel starts shouting out around the line tighten that line, it should start. If this works look for a air leak in the return line.
You can also flow test the lift pump. While you have the rubber lone off between the IP and filter, run a hose into a empty container. Bump the starter it should pump 1 1/4 quarts.
7 psi sounds low for a stock engine.
05-19-2006, 01:25 AM
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..yes, an IP can go south with reasonable pressures; How many miles are on your rig? If your LP has gone intermittent, that can put the hurt on the IP...temp is another killer of the OEM IP's; AND....10 psi does seem a bit low for the pressure, what are the presssures you see while under various driving conditions?
I think the code you quote is the companion code, indicating only that there are other codes present - where did you have your codes read at?
I think the code you quote is the companion code, indicating only that there are other codes present - where did you have your codes read at?
05-19-2006, 09:12 AM
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The code P1689 is loss of communication between ECM and injection pump. There can be several causes for this code.
Air in the VP44
Bad lift pump
Bad ECM
Bad electronics on the VP44
Bad wiring
Loosing connection in the ECM or VP44 connectors
Air in the VP44
Bad lift pump
Bad ECM
Bad electronics on the VP44
Bad wiring
Loosing connection in the ECM or VP44 connectors
05-19-2006, 11:53 AM
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thanks guys, I will try all those suggestions today, the truck has 175,000 on the od. My two manuals say for 1999 24 v 10 psi is stock, then under load drops down to about 7 to 8 which it does. The pump has always worked fine, i am the only person who drives the truck, good psi.
thanks
Brian
thanks
Brian
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