Moparmike Posted January 6, 2019 Share Posted January 6, 2019 2001 rd just did inframe less then 1000 miles on it..someone replaced the original engine with a 99 e7 427 same engine from factory just different year put new vecm had mack reprogram it to specs truck runs fine then will shut down red x comes on heater blower everything shuts down wait a few minutes starts right back up run 15 min or less shut down no codes what so ever..please help I'm so deep in this truck and not able to run it ..first did it last week ran bout 12hrs no problem then started this Thanks in advance Quote Link to comment https://www.bigmacktrucks.com/topic/55212-2001-rd-688s-shuts-down-starts-right-back-up-no-codes/ Share on other sites More sharing options...
Moparmike Posted January 6, 2019 Author Share Posted January 6, 2019 Also cruise control is not working now was working..I cant idle the truck up once air pressure builds but could before Quote Link to comment https://www.bigmacktrucks.com/topic/55212-2001-rd-688s-shuts-down-starts-right-back-up-no-codes/#findComment-412600 Share on other sites More sharing options...
hatcity Posted January 6, 2019 Share Posted January 6, 2019 Engine position sensor? My former truck did that to new owner. Cruising down the interstate, shut off, pulled over. Started right up and rest of the day and several more days fine. Then one day it happened again. His mechanic changed EPS and all fine,,,over three months now Quote Success is only a stones throw away.................................................................for a Palestinian Link to comment https://www.bigmacktrucks.com/topic/55212-2001-rd-688s-shuts-down-starts-right-back-up-no-codes/#findComment-412602 Share on other sites More sharing options...
Moparmike Posted January 6, 2019 Author Share Posted January 6, 2019 Install a new sensor on front of engine and in ball housing..would that stop the heater and cruiser from working if so I'll replace them again could have got a bad set Quote Link to comment https://www.bigmacktrucks.com/topic/55212-2001-rd-688s-shuts-down-starts-right-back-up-no-codes/#findComment-412606 Share on other sites More sharing options...
fjh Posted January 6, 2019 Share Posted January 6, 2019 The blower motor is shutting ? This is a sign that the Accessory relay Is possibly Fubar! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/55212-2001-rd-688s-shuts-down-starts-right-back-up-no-codes/#findComment-412611 Share on other sites More sharing options...
Mack Technician Posted January 6, 2019 Share Posted January 6, 2019 10-4, look past high tech solution, record what components are being effected during the power/voltage drop-out event and work backwards to what they commonly share in PDM. Quote Link to comment https://www.bigmacktrucks.com/topic/55212-2001-rd-688s-shuts-down-starts-right-back-up-no-codes/#findComment-412614 Share on other sites More sharing options...
TimberJack Posted January 6, 2019 Share Posted January 6, 2019 I had one do the same thing. Mine ended up being one of the power relays in dash. Quote Link to comment https://www.bigmacktrucks.com/topic/55212-2001-rd-688s-shuts-down-starts-right-back-up-no-codes/#findComment-412615 Share on other sites More sharing options...
Moparmike Posted January 7, 2019 Author Share Posted January 7, 2019 Yes blower motor stops when it shuts down..where can I find this relay at 2001 rd 688s E7 Thank you guys for your response Quote Link to comment https://www.bigmacktrucks.com/topic/55212-2001-rd-688s-shuts-down-starts-right-back-up-no-codes/#findComment-412617 Share on other sites More sharing options...
Moparmike Posted January 7, 2019 Author Share Posted January 7, 2019 The 4 power relays are they the relays in need to be looking at Quote Link to comment https://www.bigmacktrucks.com/topic/55212-2001-rd-688s-shuts-down-starts-right-back-up-no-codes/#findComment-412618 Share on other sites More sharing options...
JoeH Posted January 7, 2019 Share Posted January 7, 2019 The 2001 rd688st I owned for a year had relays in the glove box and a relay/fuse box under the hood, top center on the firewall. It had an etech 400 engine. FJH and co. might be talking about the accessory relay in the dash under the ash tray. On our mechanical Macks, when you bump your key on it actuates an accessory solenoid in the dash under the ash tray. It powers your gauges, radio, blower, etc. Not sure if the electronic engines use this solenoid too, I expect they do. The last couple I got from Mack are junk, they get hot on our stock truck and stop making contact reliably. Smack it with a screw driver handle usually gets it to engage. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/55212-2001-rd-688s-shuts-down-starts-right-back-up-no-codes/#findComment-412626 Share on other sites More sharing options...
Mack Technician Posted January 7, 2019 Share Posted January 7, 2019 (edited) This should get you home...……. Attn: Relay 2 distribution flow. Edited January 14, 2019 by Mack Technician Quote Link to comment https://www.bigmacktrucks.com/topic/55212-2001-rd-688s-shuts-down-starts-right-back-up-no-codes/#findComment-412659 Share on other sites More sharing options...
fjh Posted January 7, 2019 Share Posted January 7, 2019 14 hours ago, Moparmike said: The 4 power relays are they the relays in need to be looking at yup Quote Link to comment https://www.bigmacktrucks.com/topic/55212-2001-rd-688s-shuts-down-starts-right-back-up-no-codes/#findComment-412664 Share on other sites More sharing options...
Moparmike Posted January 7, 2019 Author Share Posted January 7, 2019 Took passengers side dash off looked everywhere cant find this relay mack said chrome like a ford cant find it ..1 on driver side firewall but they said that's not it..anybody have a picture just for reference that may help me thanks Quote Link to comment https://www.bigmacktrucks.com/topic/55212-2001-rd-688s-shuts-down-starts-right-back-up-no-codes/#findComment-412684 Share on other sites More sharing options...
fjh Posted January 8, 2019 Share Posted January 8, 2019 accessory relay in the dash under the ash tray Quote Link to comment https://www.bigmacktrucks.com/topic/55212-2001-rd-688s-shuts-down-starts-right-back-up-no-codes/#findComment-412735 Share on other sites More sharing options...
fjh Posted January 8, 2019 Share Posted January 8, 2019 Just now, fjh said: accessory relay in the dash under the ash tray not sure if they changed this in later years how ever check under that PLASTIC panel Three screws and your there! They may have changed to 4 relays as pictured above but the location will likely be similar! Quote Link to comment https://www.bigmacktrucks.com/topic/55212-2001-rd-688s-shuts-down-starts-right-back-up-no-codes/#findComment-412736 Share on other sites More sharing options...
Moparmike Posted January 8, 2019 Author Share Posted January 8, 2019 The 4 relays are the only thing I've found in here with big hot wires that run back out the truck Quote Link to comment https://www.bigmacktrucks.com/topic/55212-2001-rd-688s-shuts-down-starts-right-back-up-no-codes/#findComment-412739 Share on other sites More sharing options...
fjh Posted January 8, 2019 Share Posted January 8, 2019 K then if the relays got big wires running in and out those are what you need to focus on! power relay #2 look At The chart it traces back to the blower motor! Quote Link to comment https://www.bigmacktrucks.com/topic/55212-2001-rd-688s-shuts-down-starts-right-back-up-no-codes/#findComment-412744 Share on other sites More sharing options...
fjh Posted January 9, 2019 Share Posted January 9, 2019 Mike did you get anywhere with this issue? Quote Link to comment https://www.bigmacktrucks.com/topic/55212-2001-rd-688s-shuts-down-starts-right-back-up-no-codes/#findComment-412798 Share on other sites More sharing options...
Moparmike Posted January 10, 2019 Author Share Posted January 10, 2019 I hope so I changed the 3rd relay it had a black burn spot on it..put electric grease on all them .ran 11hrs yesterday no problem so far working it today so far its good.. Thanks for all you guys help 2 Quote Link to comment https://www.bigmacktrucks.com/topic/55212-2001-rd-688s-shuts-down-starts-right-back-up-no-codes/#findComment-412883 Share on other sites More sharing options...
fjh Posted January 10, 2019 Share Posted January 10, 2019 Good job! 😎 Quote Link to comment https://www.bigmacktrucks.com/topic/55212-2001-rd-688s-shuts-down-starts-right-back-up-no-codes/#findComment-412889 Share on other sites More sharing options...
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