yes i can rise rpm up down no codes i do have dealer tech tool with laptop so i did road test and no problems shown .
my friend has a volvo with volvo D12 and was explaining it to me since I have exactly the same problem but I never got it to work really.. so what he said was : before moving the truck and after releasing both brakes he presses the brake pedal all the way down, up to some pressure point on the gauges.. only after that hes able to engage cruise control while on the road It never worked for me though :/ hope it helps good luck!!
do not look for cruise problem in engine ECU. After 1998 Volvo use VECU to controll engine (not with N14 and early Series 60). So no difference what engine you have, all switches in cab are connected to VECU
Before we sold it our VNL (2006 EGR only D16) was "hunting". It would jump and drop about 50 RPM everytime we used the cruise, rapidly over and over. It was the engine computer. To completely fix this we needed a new ECM.
Hello, i am facing same problem with 2 of my FM12 truck , i think i will try to replace a good working condition VECU tomorrow and see....
It is working now I was testing every wire and sensor took the truck for test drive and it is working now So Check switch on brake and clutch pedal there is also air switch connected to the cruise it is on the left side off the clutch pedal pull the plastic panel off you will se it on the right top, check speed sensor
i had that thing too, i solved this by replaced the V shape spring which holds clutch pedal in top position, you need to remove plastic panel on the left side to the steering column, spring costed me 8.67$ ,plus mechanic adjust a bit little bolt in service brake valve ( under hood on firewall ) ,thats it !! problem solved, try this it might help
