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Allison Clutch Test - What is it? #5044414
03/15/19 08:29 PM
03/15/19 08:29 PM
Joined: May 2005
Posts: 2,316
Toronto, Canada
George7941 Offline OP
George7941  Offline OP

Joined: May 2005
Posts: 2,316
Toronto, Canada
I am attaching the two relevant pages from the Allison DOC User Manual about the Clutch Test. I do not understand what the purpose of the test is. I believe it tests the torque converter clutch. How does this test accomplish that?

Allison 1.jpgallison 2.jpg

2006 GMC Sierra 4.3l, NV3500,G80 , Mobil 1 5W30, Dexcool.
1987 BMW R80 - sold
2015 Honda CBR300R

Staying out of the right lane a lot.
Re: Allison Clutch Test - What is it? [Re: George7941] #5044454
03/15/19 09:12 PM
03/15/19 09:12 PM
Joined: Dec 2013
Posts: 3,125
Fort Worth, Texas
clinebarger Offline
clinebarger  Offline

Joined: Dec 2013
Posts: 3,125
Fort Worth, Texas
Allows you to test Clutch Holding ability & Solenoid combination/Shift Valve functionality. Selecting higher than normal commanded ratios allow easier diagnosis of slipping components.

Last edited by clinebarger; 03/15/19 09:13 PM.

2001 Chevy Camaro L92/4L80E
2006 Chevy 2500HD LBZ/Allison 1000
2010 Toyota Corolla 2ZR-FE/U341E
2000 Toyota Avalon 1MZ-FE/A541E
Re: Allison Clutch Test - What is it? [Re: clinebarger] #5044506
03/15/19 10:16 PM
03/15/19 10:16 PM
Joined: Aug 2017
Posts: 858
MN
14Accent Offline
14Accent  Offline

Joined: Aug 2017
Posts: 858
MN
Originally Posted by clinebarger
Allows you to test Clutch Holding ability & Solenoid combination/Shift Valve functionality. Selecting higher than normal commanded ratios allow easier diagnosis of slipping components.


That's about it! Tip-tronic with a little more control, basically.


2013 Chevrolet Volt - Saves enough in fuel to pay for itself!

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Re: Allison Clutch Test - What is it? [Re: George7941] #5044592
03/16/19 12:52 AM
03/16/19 12:52 AM
Joined: May 2005
Posts: 2,316
Toronto, Canada
George7941 Offline OP
George7941  Offline OP

Joined: May 2005
Posts: 2,316
Toronto, Canada
So how would I actually test for a slipping TCC? Drive along at a steady 40mph, select 5th (Drive) in the Clutch Test Mode and then see if the engine flares up if I step on the throttle? The Engine and Turbine speeds are displayed on Allison DOC, so I could watch that to see if the clutch is slipping. Is there another better way?


2006 GMC Sierra 4.3l, NV3500,G80 , Mobil 1 5W30, Dexcool.
1987 BMW R80 - sold
2015 Honda CBR300R

Staying out of the right lane a lot.
Re: Allison Clutch Test - What is it? [Re: George7941] #5045307
03/16/19 08:06 PM
03/16/19 08:06 PM
Joined: Dec 2013
Posts: 3,125
Fort Worth, Texas
clinebarger Offline
clinebarger  Offline

Joined: Dec 2013
Posts: 3,125
Fort Worth, Texas
I'm not familiar with commercial Non-GM Allison applications, In a GM application....There is a TCC Slip RPM data PID that tells you everything you need to know. It basically takes the Turbine speed & Engine speed & displays the differential.

Do you have TCC Slip code/s in the TCM?


2001 Chevy Camaro L92/4L80E
2006 Chevy 2500HD LBZ/Allison 1000
2010 Toyota Corolla 2ZR-FE/U341E
2000 Toyota Avalon 1MZ-FE/A541E
Re: Allison Clutch Test - What is it? [Re: clinebarger] #5046512
03/18/19 08:57 AM
03/18/19 08:57 AM
Joined: May 2005
Posts: 2,316
Toronto, Canada
George7941 Offline OP
George7941  Offline OP

Joined: May 2005
Posts: 2,316
Toronto, Canada
Thanks for your help, clinebarger. I have very little experience with automatic transmissions, so any help is most welcome.

The subject truck is a 2006 Freightliner M2 with an Allison 2100 HS tranny. There is no TCC slip pid in the data stream. There is engine speed, turbine speed and output speed pids. Yesterday I graphed engine speed and turbine speed while driving along a 20mph with the clutch test enabled for 2nd gear and the variation with the two speeds while I stepped on the throttle indicates that the TCC was not applied.

The TCC solenoid passes the solenoid test in Allison DOC.

I don't think there are any codes in the TCM but I will check again.

Truck is not giving any issues but I was just curious as to whether the TCC was working as it should.


2006 GMC Sierra 4.3l, NV3500,G80 , Mobil 1 5W30, Dexcool.
1987 BMW R80 - sold
2015 Honda CBR300R

Staying out of the right lane a lot.
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