redcrzr Posted June 24, 2015 Report Share Posted June 24, 2015 I have searched the forum for answers to no avail. My 99 Volvo w/Volvo D12 has a non functioning cruise control and therefore the high idle is also non existent. I have inspected wires, looked for a fuse (which I did not locate). Any ideas as to where I should look? Is this a problem for a "real" mechanic. I should add that the cruise has worked in the past although at times it hasn't. I don't remember the high idle not working. Thanks, Todd E. “…nothing so liberalizes a man and expands the kindly instincts that nature put in him as travel and contact with many kinds of people.” – Mark Twain Link to comment Share on other sites More sharing options...
lappir Posted June 24, 2015 Report Share Posted June 24, 2015 My cruise control will not engage at times unless i hit the brake. There are times when I leave somewhere and never really have to stop before getting up to cruise speed. Try pushing firmly on the brake. My truck is a 2001 with a D12 also. Rod White 2000/2010Volvo VNL 770 with 7' Drom box with opposing doors, JOST slider hitch. 600 HP Cummins Signature 18 Speed three pedal auto shift. 1999 Isuzu VehiCross retired to a sticks and bricks garage. Brought out of storage the summer of 2022 2022 Jeep Wrangler Sport S Two door hard top. 2007 Honda GL 1800 2013 Space Craft Mfg S420 Custom built Toyhauler The Gold Volvo is still running and being emptied in July. Link to comment Share on other sites More sharing options...
MrSeas Posted June 24, 2015 Report Share Posted June 24, 2015 Brake and/or clutch disengage switch might be inop or out of adjustment. Remove trim panel from under driver dash area including the panel under the steering wheel to access the switches. On a gen 2 truck the switch is a small micro switch with a "spring" arm that "touches" the brake or clutch pedal to activate the switch when you apply the brake or clutch pedal. Some times the "clip" that holds the switch to its bracket will break and allow the switch to move out of position. They have since changed the "clip" to little mounting screws. As I said this a gen 2 style truck so gen 1 might be different but the concept may be similar. Link to comment Share on other sites More sharing options...
Nuke-E Posted June 24, 2015 Report Share Posted June 24, 2015 Scott may be on the right track. I had the same problem with mine. Before pulling anything apart, try lifting/pushing the brake pedal (truck not running) and listen for the switch to click. If the click happens above where the pedal normally rests, that's your problem. Unlike a lot of cars, the brake lights and cruise control use 2 separate switches--the brake lights have an air pressure switch, and the cruise control is connected to the pedal. 45' 2004 Showhauler -- VNL300, ISX, FreedomLine -- RVnerds.com -- where I've started to write about what I'm up to Headlight and Fog Light Upgrades http://deepspacelighting.com Link to comment Share on other sites More sharing options...
redcrzr Posted June 24, 2015 Author Report Share Posted June 24, 2015 Thanks for the 3 replies. I will get to it on Thursday, it's getting pretty close to "happy hour" here. I will repost when I can. I was messing under the dash a couple of weeks ago with water leak issues, I may very well have knocked up against such a switch. Todd E. “…nothing so liberalizes a man and expands the kindly instincts that nature put in him as travel and contact with many kinds of people.” – Mark Twain Link to comment Share on other sites More sharing options...
jkennell Posted June 24, 2015 Report Share Posted June 24, 2015 Todd: DOn't forget to use DMBruss's site with all the electronic diagrams. http://www.dmbruss.com/Schematics.htm It really helps if you can find the schematic for what you are trying to fix! No camper at present. Way too many farm machines to maintain. Link to comment Share on other sites More sharing options...
Alie&Jim's Carrilite Posted June 25, 2015 Report Share Posted June 25, 2015 Depending on your transmission, your clutch will have a switch as well. If my foot even brushes the clutch pedal sideways it will disengage the cruise. The high idle might have to be dealer activated. Alie & Jim + 8 paws 2017 DRV Memphis BART- 1998 Volvo 610 Lil'ole 6cyl Cummins Link to comment Share on other sites More sharing options...
SnaykeByte Posted June 25, 2015 Report Share Posted June 25, 2015 My cruise control will not engage at times unless i hit the brake. There are times when I leave somewhere and never really have to stop before getting up to cruise speed. Try pushing firmly on the brake. My truck is a 2001 with a D12 also. Rod On my truck as the manual states, the system has to see a "brake functional safety test" each key cycle. It means the brakes have to be applied for 4 seconds after the truck is started or the cruise will not engage. On mine there is a switch on the clutch but not one on the brake pedal, it reads the brake signal from the air switch brake light circuit. "JOE DIRT"--1994 Volvo WIA64TES VED12, 425HP, SUPER 10, SINGLED, 370 REARS, DOMETIC AUXILLARY A/C, ONAN QD10000 GENNY2006 Fleetwood Wilderness Advantage AX6 40ft"I'm not in right now.......I'm out finding myself. If I get back before I return, leave me a message and one of us will get back to you..??" I'm right 97% of the time.........and nobody cares about the other 4% Link to comment Share on other sites More sharing options...
budeneighe Posted June 25, 2015 Report Share Posted June 25, 2015 I would first look for any error codes. That could be a bigger clue to what's going on. Even intermittent errors can break the cruise control lock. For instance, an intermittent problem with the throttle position sensor can cause this. It might be intermittent enough to not be noticeable in operation but all it takes it one glitch of it to lock out the cruise control and the Jake brake. If that is the original TPS then it could easily be getting noisy (like an old time volume control on a radio or TV). I struggled with mine, opened and cleaned it and it improved for awhile but ultimately had to replace it. Once I did, no more cruise control or Jake drop outs. Just a thought. RVBuddys Journal Our progress into full-timing.Budd & Merrily ===-> SKP# 088936 Other Websites:---> Hub of all my blogsClifford - 2000 VNL64T770 :: DakotR - 1999 C40KS King of the Road :: $PRITE - 2013 Smart Passion w/cruise Link to comment Share on other sites More sharing options...
redcrzr Posted June 25, 2015 Author Report Share Posted June 25, 2015 All your suggestions & comments are appreciated and extremely helpful. I have a fair amount of play in the brake pedal & I could hear the switch operating as suggested above within that range of play. I was able to adjust the switch enough to have the high idle engage again & I suspect that will also clear up the issue with the non-functioning cruise control. My '99 has a bolt adjustment. The comment about Mark's schematics-I did take a look there & couldn't see anything that made sense to a guy with my abilities. Now that it appears to be fixed, I may take another look & see if I can make some sense out of the diagrams. YOU GUYS ROCK Thanks for saving me some money. Safe travels, Todd E. “…nothing so liberalizes a man and expands the kindly instincts that nature put in him as travel and contact with many kinds of people.” – Mark Twain Link to comment Share on other sites More sharing options...
jkennell Posted June 25, 2015 Report Share Posted June 25, 2015 Depending on you truck build date, check out these two links: D12 Engine build 2.99 http://www.dmbruss.com/images/Schematics/V4_PV776_370_98184_1_EngineBrakeCC_VolvoD12B_VN_B2_98.pdf D12 engine build 5.99 http://www.dmbruss.com/images/Schematics/V5_PV776_370_98184_2_EngineBrakeCC_Volvo_D12_VN_B5_99.pdf SHow you the Engine brake and CC wiring--at leat you can see how the switches are connected and stuff! No camper at present. Way too many farm machines to maintain. Link to comment Share on other sites More sharing options...
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