|
04-02-2017, 08:58 PM
|
#1
|
Senior Member
Monaco Owners Club Coastal Campers
Join Date: Mar 2012
Posts: 2,163
|
Allison 3000 speedometer sensor
My speedometer varies from accurate to 15% high. It's usually 10% high. Is there a connector that might be dirty n the Allison?
Jeff
2001 Dynasty Regent tag axle
Cummins 350 8.3 ISC
2012 Jeep Grand Cherokee Overland
FMCA ENERGIZED Task Force Chairman
__________________
Jeff
2001 Monaco Dynasty tag axle
2018 Jeep Grand Cherokee
|
|
|
|
Join the #1 RV Forum Today - It's Totally Free!
iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!
You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!
|
04-02-2017, 11:53 PM
|
#2
|
Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,311
|
Sensor for the speedo info is located on the tailshaft of the transmission on the driver side . If your speed read out fluctuates and you don't get a transmission fault code , chances are the problem is in the speedo head.
If the read out was constant 10 % high you could check that a previous owner hadn't changed tire sizes.
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
|
|
|
04-03-2017, 05:42 AM
|
#3
|
Senior Member
Monaco Owners Club
Join Date: Sep 2010
Location: Golden, Colorado
Posts: 838
|
My speedo acted up just after I bought the coach. I removed the access panel on top of the dash and could see all gauges. I took a nut driver and tightened all the nuts in the cluster. White wire is the ground and it is daisy- chained thru all gauges. I tightened all I could reach and followed the white wire to a ground block and tightened all of then also. Now it is steady all the time. There are dip switches on the speedo to change the settings for different tires. My speedo is a Beede, I would call them if yours is the same.
Faria Beede Instruments, Inc.
Good Luck
Dave
__________________
2004 Monaco Signature with a Detroit 60, Vorad Radar, Samsung Fridge, Induction cook top, 2020 GMC Denali
|
|
|
04-06-2017, 07:32 PM
|
#4
|
Senior Member
Join Date: Apr 2009
Posts: 522
|
The speed sensor in the transmission sends its signal to the transmission controller. The controller provides a separate signal out to the speedo head. If the speed sensor in the transmission was sending incorrect signals it would mess up the shift points also. The issue is likely in the speedo head itself or its wiring.
|
|
|
07-03-2017, 11:58 AM
|
#5
|
Senior Member
Monaco Owners Club Coastal Campers
Join Date: Mar 2012
Posts: 2,163
|
Quote:
Originally Posted by dbarton291
The speed sensor in the transmission sends its signal to the transmission controller. The controller provides a separate signal out to the speedo head. If the speed sensor in the transmission was sending incorrect signals it would mess up the shift points also. The issue is likely in the speedo head itself or its wiring.
|
So the Allison ecm sends the signal to the speedo head? Is the head the gauge itself?
Where is the Allison ecm anyway? Under the keypad?
|
|
|
07-03-2017, 07:14 PM
|
#6
|
Senior Member
Join Date: Apr 2009
Posts: 522
|
Quote:
Originally Posted by Jeff753
So the Allison ecm sends the signal to the speedo head? Is the head the gauge itself?
Where is the Allison ecm anyway? Under the keypad?
|
Yes. If you follow the wires, the two speed sensor wires go into the TCM and one of the outputs from the TCM goes to the speedo. Yes, the speedo head is the gauge.
The TCM may be separate from the selector and mounted in the vehicle or it may be attached to the selector. Both configurations are available. I really don't know where in each and every vehicle the manufacturer mounts them if the TCM is separate.
|
|
|
07-04-2017, 08:28 AM
|
#7
|
Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,311
|
Here's a picture of your WTEC III controller and shift pad. As dbarton , said they are located in different places in every coach , sometimes location can vary with floor plan.
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
|
|
|
08-29-2017, 07:55 PM
|
#8
|
Senior Member
Monaco Owners Club Coastal Campers
Join Date: Mar 2012
Posts: 2,163
|
Quote:
Originally Posted by Skip426
Sensor for the speedo info is located on the tailshaft of the transmission on the driver side . If your speed read out fluctuates and you don't get a transmission fault code , chances are the problem is in the speedo head.
If the read out was constant 10 % high you could check that a previous owner hadn't changed tire sizes.
|
Now my tach is 1000 Rpms too high. Does the tach from the alternator (I think it goes to an 87a relay first) go to the Allison MD3000MH ECM before it goes to the tach gauge? My ECM is under the shifter. I may take it out and clean the connections.
__________________
Jeff
2001 Monaco Dynasty tag axle
2018 Jeep Grand Cherokee
|
|
|
08-29-2017, 08:16 PM
|
#9
|
Senior Member
Join Date: Apr 2009
Posts: 522
|
No. The Allison controller does not drive or interface with the engine tachometer at all.
|
|
|
08-30-2017, 09:29 AM
|
#10
|
Senior Member
Monaco Owners Club Coastal Campers
Join Date: Mar 2012
Posts: 2,163
|
Thank you.
__________________
Jeff
2001 Monaco Dynasty tag axle
2018 Jeep Grand Cherokee
|
|
|
09-01-2017, 07:58 PM
|
#11
|
Senior Member
Monaco Owners Club Coastal Campers
Join Date: Mar 2012
Posts: 2,163
|
Problem with my tach was dirty connections on the back of the gauge. While I was in there I loosened the speedometer connectors and sprayed them well with deoxit. Speedometer is now right on after years of being 10-15% high!!!
__________________
Jeff
2001 Monaco Dynasty tag axle
2018 Jeep Grand Cherokee
|
|
|
|
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
|
|
Thread Tools |
Search this Thread |
|
|
Display Modes |
Linear Mode
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
|
» Recent Discussions |
|
|
|
|
|
|
|
|
|
|
|
|
|