Cruise Control Cuts Out

you'd better turn to cummins for help

Cruise control is performmed by the ECU of cummins

 

Cruise kick out like that are usually cause by conflicting inputs to the engine ECM. It is seeing things that don't make sense like "Set/accel" and "resume/coast" at the same time. You will have to get the code from the engine, but all the wiring related to cruise control, engine brake controls, (speedo may be involved too), is all Volvo. Your problem could be anywhere. A Volvo dealer would be where I would start with. If you can get a Cummins fault code, I can help better, the Volvo ECU code means nothing to me.

 

Yah, I know how you feel. You pretty much have to use service manual and wire diagrams these days. You will waste a lot time just searching blind. I work at an International dealer, and one of the worst things a customer can do is bring a non-International make of truck to us to diagnose an electrical problem that is specific to that make. Trucks are all wired differently, the wires are number/colored differently, pinned different, rounted different, and so on! I can trace any wire in a Prostar, but a Volvo, I wouldn't know where to start! We will spend some time at it, but mostly we will stop and just a call the dealer of the truck and get the wire diagram. With an electical problem that is specific to your make of truck it is very advisable to always go to the proper dealer.

 

According to the code you have in VECU, its not on the engine side where the problem is taking place.....whats the last six in your VIN to give you specific troubleshooting.

 

Just a quick question, does your speedometer ever cut out when your cruise won't work?

 

Ok, I was just wondering. Had a truck that the cruise would cut out. But, not only would it stop working, the speedometer, and tripmeter wouldn't work either. It turned out to be a magnetic speed sensor in the tranny.
One thing about that, since the speedometer didn't work, the truck wasn't governed to just 65. I don't know how fast I got up to , but when I started passing people that had flew past me miles back, I decided to just get behind one of them and tag along.