UnderDawg Posted December 15, 2016 Share Posted December 15, 2016 I am working on a 2000 CH 613 with Etech 460. Jake is coming on at idle and stalling engine. So far I have checked dash switch and clutch pedal switch and they both are operating as they should. What could be the trouble? Appreciate any help as I've limited knowledge in this area. Thanks! Quote Link to comment https://www.bigmacktrucks.com/topic/48048-jake-brake-issues/ Share on other sites More sharing options...
Mackpro Posted December 15, 2016 Share Posted December 15, 2016 Unplug the wire at each valve cover and retest. If its still coming on then you got a solinoid stuck open on top of the jake housing or other internal issue. 2 Quote Link to comment https://www.bigmacktrucks.com/topic/48048-jake-brake-issues/#findComment-355180 Share on other sites More sharing options...
UnderDawg Posted December 15, 2016 Author Share Posted December 15, 2016 Thanks for quick reply. There is a little more to the story, former owner of truck was having stated issue and instead of finding problem he wired jakes directly to dash switch. He had to manually turn jakes off when he wanted to power on again but that didn't happen always when it should have and he damaged pin actuator on number one cylinder. Truck came here with rattle in engine. Trying now to get jake working as it's supposed to. Both cut wires are visible in harness but have no power coming through either with system on( key on and or engine running). There is power at disable relay, dash switch and at clutch switch. Again thanks for any and all help. Quote Link to comment https://www.bigmacktrucks.com/topic/48048-jake-brake-issues/#findComment-355185 Share on other sites More sharing options...
theakerstwo Posted December 16, 2016 Share Posted December 16, 2016 I could be a bad solinold or bad o/rings under them letting oil thru at all times. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/48048-jake-brake-issues/#findComment-355199 Share on other sites More sharing options...
gearhead204 Posted December 16, 2016 Share Posted December 16, 2016 is there a relay in the original system? thinking you may have a bad or intermittent relay issue Quote Link to comment https://www.bigmacktrucks.com/topic/48048-jake-brake-issues/#findComment-355205 Share on other sites More sharing options...
UnderDawg Posted December 20, 2016 Author Share Posted December 20, 2016 Both solenoids click when power run direct to them. Applied power to solenoids at idle but got no brake response. Engine has 29 psi at idle and 57 psi at 1200 rpm at operating temp. Any way to test o-rings at solenoids? Still trying to diagnose. Thanks for help. Quote Link to comment https://www.bigmacktrucks.com/topic/48048-jake-brake-issues/#findComment-355656 Share on other sites More sharing options...
wilbur Posted December 24, 2016 Share Posted December 24, 2016 Underdog When testing at idle you need to hold the hot wire on there a few seconds before it will come on. If they dont I would start with the solenoid first. With the truck not running they should at least click. Quote Link to comment https://www.bigmacktrucks.com/topic/48048-jake-brake-issues/#findComment-355919 Share on other sites More sharing options...
UnderDawg Posted December 30, 2016 Author Share Posted December 30, 2016 Thanks Wilbur! Solenoids do click when power applied but I'll try waiting next time with it running. Thanks to all for replies. Quote Link to comment https://www.bigmacktrucks.com/topic/48048-jake-brake-issues/#findComment-356519 Share on other sites More sharing options...
Swishy Posted December 30, 2016 Share Posted December 30, 2016 Some older macks require the solenoid wire to run to earth also @ idle revs there B a cut out set up have had problems B 4 then we fit new relay = OK cya §wishy Quote Link to comment https://www.bigmacktrucks.com/topic/48048-jake-brake-issues/#findComment-356522 Share on other sites More sharing options...
UnderDawg Posted December 30, 2016 Author Share Posted December 30, 2016 Thanks for reply Swishy! I'll check out your suggestion. Quote Link to comment https://www.bigmacktrucks.com/topic/48048-jake-brake-issues/#findComment-356525 Share on other sites More sharing options...
UnderDawg Posted January 3, 2017 Author Share Posted January 3, 2017 Another question about same 2000 CH 613! Where do I find ABS module? Thanks for help! Quote Link to comment https://www.bigmacktrucks.com/topic/48048-jake-brake-issues/#findComment-357013 Share on other sites More sharing options...
Challenger Posted January 4, 2017 Share Posted January 4, 2017 4 hours ago, UnderDawg said: Another question about same 2000 CH 613! Where do I find ABS module? Thanks for help! Behind the passenger side kick panel. The black metal panel at the passenger's feet. Quote Link to comment https://www.bigmacktrucks.com/topic/48048-jake-brake-issues/#findComment-357053 Share on other sites More sharing options...
UnderDawg Posted January 5, 2017 Author Share Posted January 5, 2017 Thanks Challenger. Quote Link to comment https://www.bigmacktrucks.com/topic/48048-jake-brake-issues/#findComment-357230 Share on other sites More sharing options...
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