Engine/Transmission (1998.5 - 2002) 1689 code even after new I.P. install.....

[TSRAM]

I installed a new IP last week and after some hair pulling after a no start, I also found out that my "new" ECM was having a problem and would not let the truck start. I swapped the old ECM back in and the truck fired right up. After letting it run for about 15 mins. , I swapped the "new" ECM back in and again, no start. So, now I'm back to the orig. ECM and all is good for a week. I get in yest. afternoon and crank, the truck revs to about 1500 sets the CE light, and idles back down. The code is 1689. Tomorrow I am already planning on changing the MAP sensor already for an occasional overboost code.

How many different KNOWN causes (or cures) for the 1689 (No comm. between ECM and IP. )

2 weeks time: Bad ECM, Injection pump, Map sensor, now this... ... ... ... ... Tools are close to flying. :{ :{

 

[DieselLady]

I installed a new IP last week and after some hair pulling after a no start, I also found out that my "new" ECM was having a problem and would not let the truck start. I swapped the old ECM back in and the truck fired right up. After letting it run for about 15 mins. , I swapped the "new" ECM back in and again, no start. So, now I'm back to the orig. ECM and all is good for a week. I get in yest. afternoon and crank, the truck revs to about 1500 sets the CE light, and idles back down. The code is 1689. Tomorrow I am already planning on changing the MAP sensor already for an occasional overboost code.

How many different KNOWN causes (or cures) for the 1689 (No comm. between ECM and IP. )

2 weeks time: Bad ECM, Injection pump, Map sensor, now this... ... ... ... ... Tools are close to flying. :{ :{

The 1689 code is a PCM code and just means that the ECM has set a code and it is letting you know that. Before you change out any thing else you need to find out what code has been set in the ECM and address the problem from there. If you don't clear the code in the ECM after the fix has been done you will keep getting the 1689 untill you do clear it. The ECM will tell you exactly what is going on, or get you a lot closer to the problem. Good luck.

 

[DieselLady]

BTW. What was the original problem. I have a 99 also with a comp box and recently installed the FASS system. Almost immeadiatly I got a hard start condition. turns out the Injector pump timing gets messed up if you have too much fuel pressure on the front side of the pump for cranking. I hooked up a toggle switch to the FASS pump to disable it during starting and the truck fires up instantly now. As soon as it fires I hit the switch and have 16+ psi of fuel. Wierd, yes but it works. I figured it out when it was hard to start all the time except immeadiatly after shut down when it doesn't cycle the lift pump. Just a suggestion.

 

[TSRAM]

I had a VP44 take a nosedive about 15 mins. after I changed my ECM. I had gotten the 602 and 1689 codes about a week earlier, but had the ecm already coming so I had to try it. My lift pump curciut is not working right on my ecm. If I bump the starter the LP wil come on and cycle, but will drop back to 0psi after running. My pusher is on a toggle switch now to give me direct control as you have.

 

[DieselLady]

Wow you have a tough one here. The P0602 code says "ECM fueling Clibration Error" on the DRB Display and the Brief Description in the book says "ECM internal Fuel condition detected". Its hard to tell from your post what happened first. Did you install the new ECM before the IP or after or did you do both at the same time. I know this may sound dumb but it's a lot harder to diagnose where the problem is if you do a bunch of changes at once. If you installed the new ECM and the truck ran and then installed the IP and it didn't, chances are it's in the IP. There is a no mechanical timing adjustments to the vp44. All timing is done by the ECM. According to the Book, it says, "However if a Diagnostic Trouble Code has been stored indicating an "engine sync error" or a "static timing error" perform the following. If this DTC appears after installation of a new or rebuilt injection pump, the pump keyway has probably been installed backwards. - Pump timing has been calibrated to pump keyway. Be sure 3-digit number on pump keyway matches 3-digit number on fuel injection pump data plate. Plate is located on side of IP. Twenty one different calibrated keyways/pumps are available. Be sure keyway is installed with arrow pointed to REAR of pump. After repair is compleated erase code using DRB scan tool. "

If the ECM was installed after the IP and you know the truck runs with the old ECM I would be suspicious of the new ECM. Out here is Calif. we can only use Calif. ECMs in our truck due to emission controls. ECMs from other states will not work in a Calif. truck. I don't know if all ECMs are truck specific but it would be worth a phone call to 1-800 diesels to find out. Also have you unpluged the DDUFM to see if that could be part of the problem. Does that box tap the IP wire? If so it could be compounding the issue. Let us all know when you figure it out. I am curious to know what is going on. Thanks. Betty

 

[TSRAM]

I got the codes. I changed the ECM. After I let it idle for about 10 mins. with no codes showing, I test drove the truck. I got maybe a mile before the I. P. died and gave the 602 and 1689 codes. I changed the I. P. . No crank. Put the orig. ECM in fired right up. Re-installed the "new" ECM. No crank. I am now running the orig. ECM, no wire tapped to the I. P. . I do not want to void the warr. on the I. P. for at least awhile. I just changed the MAP sensor this morning, cleaned the IAT sensor, then cleared the only code showing(1689), then test drove the truck with the comp box removed completly. Everything is fine with the exception of only 15-16psi of boost.

I never removed the key from the new pump, I know the keys match each pump. I did triple check the key alignment during and after the install and no crank. The codes would not clear with the "new" ECM after the pump install. No code showed with the orig. ECM.

 

[DieselLady]

Okay at this point anything more from me would just be guessing. It sounds like you know what you are doing with the installs. Do you know if the new ECM is compatable with all the trucks. There has to be something that we don't know and it will probably turn out to something simple. Did you check for boost leaks?? Too bad it is the Holiday weekend. I could make a few calls to some friends but may not be able to get them till Tues. Sorry I couldn't be more help. I'm still learning alot about the vp44 myself. Will post again if I get any ideas.

 

[DieselLady]

Hi TSRAM, Okay I have to admit I screwed up. Had a blond moment, whatever, but something was bothering me about your problem so I went back to the book and discovered I had turned the code around. You said your code was a 1689 and I was thinking 1693. So now that I woke up here is what the book says about the 1689 code.

"NO COMMUNICATION BETWEEN ECM AND INJECTION PUMP MODULE" Brief description of DTC would be "DATA LINK CIRCUIT FAILURE BETWEEN ECM AND FUEL INJECTION PUMP. LOW POWER, ENGINE DERATED, OR ENGINE STOPS. "

This sounds alot more like what is going on in your case. I don't know but it sounds more like a loose wire or bad ground maybe. When I first got my comp box and was installing it they stressed using caution when tapping the pump wire because it is easy to cut through it all the way or even a portion of the way. Maybe it has become intermittant. Anyway. Don't take my word for it as I am having a slow brain day. But at least it finally kicked in at the last moment. Betty

 

[480RUGER]

Good luck. Hope this is not another shot at things to come for you or me. Do you remember where you got the 180 T-stat so I can get another one?

 

[TSRAM]

I got the t-stat at Carolina International in Darlington. I think it was around 20 bucks back then. Did you find out anymore about your coolant loss?

 

[480RUGER]

Still working. Been here 21 days and might get a day Sat. If so I'll look then