NPR fuel pump relearn with SO prolink issue

Matt Technical Support Specialist Dallas, Texas Posted   Latest  
Resolved
Heavy Duty
Tooling
2006 Isuzu NPR 5.2L (6 4HK1)

Hello Yall, 

I have an issue with this NPR. Replaced the high pressure pump for fuel in the crank case. Truck now runs with nearly zero throttle response. Following the fuel pump supply learn procedure per the service manual and a brand new Snap-On Prolink.

The pump status PID never changes off NOT LEARNED. Tried several times.

diag​.​net/file/f5pkuj3d1…

Snappy rep came out with the diag guy and another prolink, same issue. When attempting relearn it comes up with an error for "unknown error, recycle ignition and restart test". Of course, it's not the tool, it's the truck. I'm not buying that answer.

By chance does anyone recall using this tool to relearn an NPR pump? I think it may be a wheel chock.

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Michael Diagnostician
Irving, Texas
Michael Default
 

Have you tried a different tool? I am wondering if it is a timing issue with the communication between the vehicle and and the scan tool.

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Matt Technical Support Specialist
Dallas, Texas
Matt Default
 

Don't have a different tool at the moment. Truck was serviced on site. It's a $900 tow away from civilization. This guy appears to have a 20K wheel chock on hand and his tool rep simply says it's not an issue because another wheel chock of the same model creates the same result. When you say timing issue, are you thinking the pump is not timed correctly so much that it can't even change the…

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Michael Diagnostician
Irving, Texas
Michael Default
 

Timing, as the Scan tool is not getting the response it expect from the vehicle. Say Scan tool A wait 3 seconds for a response and fails the test because a response was not received, where Scan Tool B's software waits 30 seconds for a response and completes the test. In your case, it may never get the Temperature Data it's waiting for.

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Helpful
Matt Technical Support Specialist
Dallas, Texas
Matt Default
 

Makes sense. We did make sure ECT was over 149⁰ before attempting again. Same message, close to instant. Thank you, will let you know what happens

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Henry Owner/Technician
Southampton, Pennsylvania
Henry Default
 

We've done a number of these Matt, the SO tool has worked every time. Pump is installed and timed correctly? Idle up knob on dash is not turned out?

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Helpful
Matt Technical Support Specialist
Dallas, Texas
Matt Default
 

After discussion with the tech that installed the pump, I don’t feel that it was timed properly. Will probably be pulling it back apart. Good to know someone else has done this scan tool function with success. I greatly appreciate yall’s input, have a blessed day!

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Helpful
Matthew Mobile Technician
Bartlett, Illinois
Matthew Default
 

If the Snap-on does not work after pump timing is verified the shop may want to call Diesel Laptops. They have a remote injector programming kit: diesellaptops​.​com/collections/re… I am assuming they may be able to do this reset for the shop as well. May be a better option that towing it away. And yes, Texa is the way to go, especially compared to the overpriced Snap-on. I have…

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Mike Owner/Technician
West Palm Beach, Florida
Mike Default
 

I think the programming they do is entering the flow rate of new fuel injectors. That doesn't appear to be his issue and Diesel Laptops terribly over charges for that service. Their scan tool is also junk. I own one and consider it the worst tool investment I have ever made, by far.

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Matthew Mobile Technician
Bartlett, Illinois
Matthew Default
 

My point was if you asked them before getting the tool they might offer to do this reset as well, the shop would have to call first. How is it overpriced if just towing it to another shop would be a minimum of $700, before additional labor? Mobile techs around here would charge the same amount anyways. Which scan tool of theirs do you have that is junk? I have been pretty impressed with Texa…

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Helpful
Mike Owner/Technician
West Palm Beach, Florida
Mike Default
 

I have the Diesel Laptop. I dislike it greatly. I find the set up to be counter intuitive and the capabilities to be lacking for the price of the tool. I could see it passing as maybe a $2000-$3000 tool. Not a $7000 tool. I have made more use of the laptop the VCM came with using it with my MDI2 than I have with the intended VCM. By now, it is a last resort tool in the shop if none of our other…

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Mike Owner/Technician
West Palm Beach, Florida
Mike Default
 

I mentioned it in another reply, but it deserves to be repeated. I would strongly recommend against Texa and a Diesel Laptop. It is one of the most useless scan tools I own. I've never tried it on an Isuzu since I own an IDSS, but it has failed to help us on almost every vehicle we have tried to use it on. The little bit I've tried Snap On or Autel on medium duty trucks, they have been more…

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Interesting
Matthew Mobile Technician
Bartlett, Illinois
Matthew Default
 

I haven't used it much on Isuzu, good to know. I have used it on many others and even let some OEM subscriptions expire because of Texa.

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Michael Mechanic
Montgomery, Texas
Michael Default
   

I see a lot of answers to your question about the Snap-on scan tool Etc I'm wondering what was the original diagnosis 4 fuel in the oil how did they determine the high pressure pump was the culprit? There are a lot of fuel connections, washers etc under the valve cover... and several times I have had the return fuel line cracked next to one of the banjo bolts on the injectors.

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Oscar Diagnostician
Lorton , Virginia
Oscar Default
 

Hope you have resolve your issue, but if you haven’t, I use the Autel 908p to relearn the injectors in the past for this type of trucks, I’m not sure if you can get your hands on one of those tools, maybe that would do your relearn on the pump for you. Good luck!!

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Michael Diagnostician
Irving, Texas
Michael Default
 

Autel has worked for me on other vehicle's for different stuff, but the number one question I always have is did someone do it with the same process on the tool before. Having a record that someone did it before, confirms it could be another issue. Only question I have is, why didn't the status change. Wouldn't it start and then fail?

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Michael Mobile Technician
Clinton, Utah
Michael Default
 

Hi Matt, I would recommend looking for someone in your area with a TEXA tool. TEXA has very good coverage of Medium Duty. I worked on a UD yesterday an International School Bus last weekend. One of my customers has a Hino and Isuzu trucks in their fleet. It has done a good job with all of them. The Iscan III and CanDo have decent Medium Duty coverage as well.

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Matt Technical Support Specialist
Dallas, Texas
Matt Resolution
   

Well the consensus was the snappy should have no issue learning this pump or the pump was installed out of time. The pump timing was confirmed. For the sake of time, the shop owner towed it to the dealer where the quickly learned the pump and were out on road test. I have never used the prolink, have owned verus for some time, very capable light duty tool with a decent scope. Sounds like the…

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Matthew Mobile Technician
Bartlett, Illinois
Matthew Default
 

Thanks for the update. I use a Snap-on every day for light-duty and it is by far my favorite aftermarket tool. I say that, because I am not a hate everything Snap-on bashing person. One thing I will say is the Prolink is EXTREMELY overpriced for what you get. The HD aftermarket scan tool has always been lacking. Texa and Cojali have picked up the pace. Someone on this thread was not very…

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Agree
Matt Technical Support Specialist
Dallas, Texas
Matt Default
 

I had the last shop purchase a Autel CV. We needed something for NPR's. They didn't like the IDSS for a smaller fleet and wouldn't bite on the Texa. I had very mixed reactions with the Autel. It was a complete wheel chock for Wabco or Catapiller. It had about 80% coverage on the NPR's. For the price I feel like it's worth it if you know it's capabilities and Swiss cheese coverage.

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