<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by SteveG:
You did not mention what instrument provides this message. On my 2004 Journey (Freightliner) they provided a Drivers Information Center manufactured by Medallion. It sounds like we have the same instrument. If so,
The alarm screens indicate:
1st The item in alarm state
2nd Current value
3rd The threshold that needs to be met to eliminate the alarm.
The following is taken from a file titled "RV Friendly Interactive Customer Info Center.ppt. I can not recall where I found this file or who sent it to me. If you would like ac opy let me know by private message how to contact you via e-mail and I can forward you a copy.
"The Auto Idle Feature will automatically increase the engine RPM when a low system voltage is sensed under the following conditions: (Gear = Neutral ,Park Brake is set, the engine is at idle > 500 rpm, the system voltage drops below 12.2V, and the service brake is not on). The MMDC will increase the idle speed using the cruise control feature until the battery voltage at the engine ECM (broadcast over J1939) reaches 13.4V. This is done by broadcasting cruise on and cruise accelerate switch status messages until a 40-rpm increase occurs, with an increase in RPM every 5 seconds with a max increase to 1800 rpm. At 13.4V the engine rpm will be held constant until the service brake is depressed or the transmission is shifted out of neutral. At that time the auto idle feature will be disabled and the engine will return to normal operation. The auto idle feature will not be re-enabled unless the engine rpm < 500 or the gear is shifted out of neutral."
The Drivers Information Center is connected to a module called a MMDC. The following is from the Medallion website Here
"Multiple Module Data Concentrator (MMDC)
The Multiple Module Data Concentrator (MMDC) is Medallion's instrument system controller for vehicles equipped with electronically controlled engines supporting the SAE J1939 Data Link Standard. At the heart of the Instrument Systems is the MMDC, but it is more than just a controller:
"¢ The MMDC gathers information from the SAE J1939 data link, various sensors scattered throughout the vehicle, and its own internal Pressure Sensors and conditions this information for display.
"¢ The MMDC acts as a Gateway between the mission critical SAE J1939 data link and other data links installed in the vehicle.
"¢The MMDC supports a distributed multiplexed communication and control architecture.
The MMDC was designed to perform in harsh environments and complex applications. We used surface mount construction and encased the MMDC in a rugged potted enclosure to meet SAE J1455 environmental standards."
Hope this helps. SteveG </div></BLOCKQUOTE>
So on my new Damon Astoria, if the unit has been sitting unplugged for more than a few hours, when I start, I get the low voltage warning, high idle, etc. The dash volt meter fluctuates between 13ish and 9ish. The information center shows the ABS LED voltage of 8.4 and the system output at 15.
Does this sound like a bad chassis battery? The rig starts fine - and the ABS LED voltage comes up to 13.1 after less than a minute. I can't find any definition of what the ABS LED (LED ABS?) voltage is. Any help much appreciated.