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Engine & Transmission communication issues

Yahoo Message Number: 103137
All,

2005 Allure - Cat C9 engine / Allison MH3000 transmission

The coach now resides in the UK (across the pond!) and is therefore a very long way from dealers / shops in the US - we have an acute lack of RV familiar shops over here

Have recently had Allison UK (their agent in the south-west) and Finning (the CAT dealers on this side of the pond) attempt to communicate with their respective components

Allison attempted to communicate via the fly lead / Deutz plug / rectangular plug found beneath the dash and the plugs in the battery bay - without success

Finning attempted to communicate via the two Deutz plugs located in the battery bay - without success

Whilst there appear at present to be no major issues with either component - I am keen to establish communication in advance of the 'need' for diagnosis in the event of breakdown with either

Before I commit further time and money to these investigations - can anyone  please advise on their experiences / resolutions / experiences

?? Is there something I am missing - is there a procedure for connection / communication that the technicians over here may not be aware of

Thanks in anticipation

Ian S.
Exeter, UK

2005 Allure # 31321 - Cat C9 #9DG02935 - Allison MH 3000 transmission

Re: Engine & Transmission communication issues

Reply #1 –
Yahoo Message Number: 103138
Maybe they could call Caterpillar in the US and find out if an adaptor is needed?

We have a Cummins ISL and we lost the ECM  - have no idea why.  It may have gotten corrupted.  Anyway Cummins "reflashed" it and it now communicates.

Here's a link to the Caterpillar forum if you haven't posted there yet: CAT RV CLUB

In addition we found that we have a key in the driver's area on the panel that if you turn it in the 'on' position you can communicate with the engine via the engine warning light flashes.  You of course would need the list of flash codes and what they mean to do so.  That is handy if you are on the hwy and need to communicate with a technician.

Lonny & Diane Livingston
'04 Allure #31065

Re: Engine & Transmission communication issues

Reply #2 –
Yahoo Message Number: 103140
If it is your j-1939 wires. I had this problem and it took me a Cat dealer & two Allison dealers & finally getting it repaired at Country Coach. The problem is in the engine bay above the muffler. The wiring is a 70c deg. wire. The heat from the muffler causes the wiring to melt internally. This is a problem for all Inspires & other models. Remove the shielding and check for melting of the wiring right above the muffler. If you need any additional help please email me at mlgunn1@... and I will give you my phone num. Hope this helps Mike

Re: Engine & Transmission communication issues

Reply #3 –
Yahoo Message Number: 103144
Mike, others,

Great reply - gives me somewhere to start looking

CC have advised overnight that they have the plug drawings and other information on this for our coach (for nominal cost, no problem) - which I am having emailed across the pond to help

Others, please keep the solutions / resolutions coming

Great forum, thanks all

Ian S.

2005 Allure # 31321

Cat C9 / Allison MH3000 transmission

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Re: Engine & Transmission communication issues

Reply #4 –
Yahoo Message Number: 103194
Ian,  one other thing. If I remember correctly the ohm's between the front and rear resistors is 135 ohm's,therefore you should be able to tell if there is an open circuit or not.
Mike

Re: UPDATE - Engine & Transmission communication issues

Reply #5 –
Yahoo Message Number: 103270
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Update on recent transmission issues
 The trouble was traced to a badly fitted terminal crimp on the end of a data cable (wires E793 and E794) behind the dash - this terminal metal crimp, obviously fitted at the factory, was causing E793 and E394 to 'short' across
 The data cable appears to exist for an 'option / use' that our coach does not have in the dash area
 Once the crimp was removed and the CAN wires separated - full communication across both components from both the front and rear reader ports - one very happy owner, one very chuffed technician
 The transmission tech who came out established identical voltages on the 2 CAN wires on the Allison reader port indicating a direct 'short' somewhere on the data systems - because both data protocols are piggy backed at the rear reader ports both protocols were being affected - it was then a question of disconnecting each data plug in turn to 'remove' the shorting component / cable from the data communication
 Once the 'offending' cable was unplugged and communication restored - it was then a question of 'tracing' the offending data cable from the plug to locate / solve the problem

Hope this of help to someone in the future

Thanks to those that replied

Ian S.
Exeter, UK

2005 Allure # 31321 - Cat C9  - Allison MH 3000 transmission
 

Re: UPDATE - Engine & Transmission communication issues

Reply #6 –
Yahoo Message Number: 103297
Ian, The connector under the dash is used for monitoring hardware for the engine and transmission such as Silverleaf and I believe ScanGauge also.

I have the Silverleaf VMSpc and it is well worth the money. Barney07 Inspire 52059