57oldgoat Posted February 16, 2014 Share Posted February 16, 2014 Maybe someone can help. I have a '09 Pinnacle CXU 613 that derates everytime I go through slush or a puddle of water. The pto light comes on the dash, I tried to reboot the ecm by shutting the ignition off and restarting the engine but it won't restart as long as the pto light is on. I'm thinking it might be a loose or corroded wire in the harness somewhere. And I thought cats were afraid of water,my mud puppy can't stand it either.Any help on where to look or what wire to rip out would be greatly appreciated. Thanks. Quote Link to comment https://www.bigmacktrucks.com/topic/34700-pto-light-comes-on-and-disables-throttle-pedal/ Share on other sites More sharing options...
smorse54 Posted February 16, 2014 Share Posted February 16, 2014 Sounds like the grounding switch on the PTO is shorting out with the water. Check the wires and put dielectrical grease on the connector at PTO. Quote Link to comment https://www.bigmacktrucks.com/topic/34700-pto-light-comes-on-and-disables-throttle-pedal/#findComment-232889 Share on other sites More sharing options...
57oldgoat Posted February 16, 2014 Author Share Posted February 16, 2014 That's what I thought also, but upon further investigation I noticed that when my blower pto is engaged it does not light up the "pto" light on the dash. Is there a factory wire in the harness that powers the pto? Quote Link to comment https://www.bigmacktrucks.com/topic/34700-pto-light-comes-on-and-disables-throttle-pedal/#findComment-232919 Share on other sites More sharing options...
Newfie Posted February 16, 2014 Share Posted February 16, 2014 there should be no factory wiring for PTO as it is a aftermarket add on.. I would look at how the pto is hooked up it may be wired backwards for the light or cut into a sensor wire for your fuel peddle.. check the ground wires for the PTO also as it has happened to me in a fr---------r.. we found that the shop installed it had the light hooked to the lighter for the light Quote Link to comment https://www.bigmacktrucks.com/topic/34700-pto-light-comes-on-and-disables-throttle-pedal/#findComment-232922 Share on other sites More sharing options...
Macktech689 Posted February 16, 2014 Share Posted February 16, 2014 If your PTO is activated using a dash rocker switch the cab and chassis wiring harness's are used and a signal is sent to the vehicle control module. Quote Link to comment https://www.bigmacktrucks.com/topic/34700-pto-light-comes-on-and-disables-throttle-pedal/#findComment-232929 Share on other sites More sharing options...
57oldgoat Posted February 16, 2014 Author Share Posted February 16, 2014 when i go through a puddle of water, a live wire shorts out somewhere underneath the truck making the ecm believe that the pto is engaged. the icon on the dash "PTO" lights up and derates the engine. I do have a pto installed but it is aftermarket and not wired through the ecm, and while engaged it has never turned on the PTO icon on the dash. Is there a factory PTO wire in the dash or in the wiring harness that that I can disarm as I don't need it to operate my aftermarket blower pto? Quote Link to comment https://www.bigmacktrucks.com/topic/34700-pto-light-comes-on-and-disables-throttle-pedal/#findComment-232941 Share on other sites More sharing options...
Solution Macktech689 Posted February 16, 2014 Solution Share Posted February 16, 2014 Yes the PTO wiring goes through the Transmission, chassis and cab harness. If its not being used the PTO connector is tied up on top of the transmission on the left side. If you cant find the problem a dealer can disable the PTO option since you dont need it. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/34700-pto-light-comes-on-and-disables-throttle-pedal/#findComment-232943 Share on other sites More sharing options...
57oldgoat Posted February 16, 2014 Author Share Posted February 16, 2014 Thanks Gear Jammer. I'll have a good look at that harness. In the mean time, looks like my puppy dog'll be going around the puddles. Quote Link to comment https://www.bigmacktrucks.com/topic/34700-pto-light-comes-on-and-disables-throttle-pedal/#findComment-232944 Share on other sites More sharing options...
Macktech689 Posted February 16, 2014 Share Posted February 16, 2014 Make sure the connector hasn't fallen down under the trans. where it can get wet. Quote Link to comment https://www.bigmacktrucks.com/topic/34700-pto-light-comes-on-and-disables-throttle-pedal/#findComment-232946 Share on other sites More sharing options...
57oldgoat Posted February 16, 2014 Author Share Posted February 16, 2014 I'll have a good look. If I can find that wire in the dash or fuse box, I'd be able to disarm it completely. Quote Link to comment https://www.bigmacktrucks.com/topic/34700-pto-light-comes-on-and-disables-throttle-pedal/#findComment-232948 Share on other sites More sharing options...
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