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12-18-2017, 02:28 PM
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#1
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Senior Member
Join Date: Aug 2017
Posts: 249
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Message at Startup - Mandalay Coach
2008 Mandalay Coach Presidio 400
When I start my coach up the following message is displayed:
! AUTO IDLE
SYS VOLTAGE 11.5 VOLTS
THRESHOLD 13.4 VOLTS
on some start-up the "Sys Voltage line says "13.1 VOLTS
Anybody know what this is trying to tell me and what do I do about it.
__________________
Ted and Debbie
2008 Mandalay Coach Presidio 400
USMC VET
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12-18-2017, 02:41 PM
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#2
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Senior Member
Join Date: May 2015
Location: San Jacinto, CA
Posts: 411
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Message at Startup - Mandalay Coach
.....Just going by what it says, it’s telling you that you have your coach set at automatic idle as opposed you manually controlling with as an example high idle. Your system voltage on your chassis batteries at start up is 11.5 volts and the 13.4 threshold is the normal voltage your batteries should sit at and and anything above that or below I believe is when your charger it’s doing what is necessary to maintain your batteries, welcoming any clarification if my explanation is not correct anywhere. There is nothing you have to do about it unless you see changes.
WDK
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12-18-2017, 02:44 PM
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#3
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Member
Join Date: Aug 2017
Posts: 86
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I think, not sure, your batteries maybe going south. Couldn't hurt to have them checked.
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12-18-2017, 03:00 PM
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#4
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Senior Member
Join Date: Aug 2017
Posts: 249
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Quote:
Originally Posted by mhshaffer
I think, not sure, your batteries maybe going south. Couldn't hurt to have them checked.
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The chassis batteries were recently replaced(Interstate flooded cell) so I'm guessing you are talking about GEN and Engine batteries (1 each AGM type)
__________________
Ted and Debbie
2008 Mandalay Coach Presidio 400
USMC VET
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12-18-2017, 03:10 PM
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#5
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Member
Join Date: Aug 2017
Posts: 86
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Yes
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12-18-2017, 03:12 PM
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#6
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Senior Member
Join Date: May 2015
Location: San Jacinto, CA
Posts: 411
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Message at Startup - Mandalay Coach
Quote:
Originally Posted by krudawg
The chassis batteries were recently replaced(Interstate flooded cell) so I'm guessing you are talking about GEN and Engine batteries (1 each AGM type)
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.....it seems you will have to determine exactly which batteries that message is talking about. Should be in your manual. To me it’s your chassis batteries and at start up may be suffering from the load but should quickly come back up with the engine running. Get a meter and check them if there is no display telling you what they might be when they are just sitting and running.
WDK
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12-18-2017, 03:46 PM
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#7
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Member
Fleetwood Owners Club Freightliner Owners Club
Join Date: Sep 2015
Posts: 72
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Does the voltage return to normal after a couple of minutes? If it does it is probably the engine grid heater cycling.
__________________
Droski
2021 F250 PowerStroke
2022 Arctic Fox 27-5L
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12-18-2017, 05:35 PM
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#8
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Senior Member
Join Date: Aug 2017
Posts: 249
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Quote:
Originally Posted by Droski
Does the voltage return to normal after a couple of minutes? If it does it is probably the engine grid heater cycling.
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Huh? whats that?
__________________
Ted and Debbie
2008 Mandalay Coach Presidio 400
USMC VET
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12-18-2017, 06:38 PM
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#9
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Senior Member
Join Date: Jul 2014
Posts: 35,317
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Cummins engines use grid heaters ( like a toaster ) in the intake manifold to pre-heat the incoming air, so it doesn't smoke at startup. It helps with cold starting too.
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12-18-2017, 11:09 PM
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#10
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"Formerly Diplomat Don"
Newmar Owners Club
Join Date: Apr 2005
Location: Moorpark, Ca.
Posts: 23,912
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Ted, does your coach do this all the time? As stated, your engine has a heater grid. It usually operates in colder weather. IT draws a LOT of amperage when it turns on. Sometimes it will turn on and off a couple of times during initial startup. If yo watch your dash volt meter, you'll often see it swing back and forth as the heater turns on and off.
Side Note:.....In the old days when a coach wouldn't start, they would spray starting fluid into the engine (ether). If you do that with a modern diesel engine, you could have an explosion (ether hitting the heater grid). That's why they tell you to never spray ether into a newer diesel.
__________________
Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor
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12-22-2017, 07:46 PM
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#11
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Senior Member
Winnebago Owners Club Fleetwood Owners Club Holiday Rambler Owners Club
Join Date: Dec 2011
Location: North East Florida
Posts: 1,994
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Auto idle simply means that. You aren't going to (manual) fast idle.
The reason you see 11.5 volts is because the battery pulled down from the grid heater and probably the air compressor is filling the tanks.
All this is normal and the 13.1 is pretty normal voltage as the batteries recharge to the target of 13.4.
__________________
2019 Horizon 42Q
Cummins L-9 450 HP
Maxum Chassis / IFS with Tag
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