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Topic: Detroit 6v92 died (Read 2662 times) previous topic - next topic

Re: Detroit 6v92 died

Reply #20 –
ECM Blower? What is that? I've never heard of an ECM blower. All of our U300 6V-92TAs have a DDEC II (2) ECM. Our ECM are in one enclosure on top of the engine. It has a fuel line that runs through it to cool it.

DDEC I (1) did have two boxes, one on the engine and one in the cab. There may have been a fan for the one in the cab but it was my understanding that all Foretravel 6V-92TAs have DDEC II fitted.

Attached is the schematic for the DDEC II. As you can see, there is no ECM fan motor. All the connections are listed in the box in the top left corner of the schematic.

Am I missing something?

Pierce

Re: Detroit 6v92 died

Reply #21 –
Need to check spelling meant ecm fuse blew.

Re: Detroit 6v92 died

Reply #22 –
OK, thought they were selling you on the easy 8 cylinder modification.

The ECM fuse in the second row is supposed to be a 10 amp, not 5 amp. Thought you said it was OK in reply #6. I don't see a second fuse on the under dash fuse map.

Disregard my #4 and #6 relays as they are for the Allison computer.

Pierce

Re: Detroit 6v92 died

Reply #23 –
I just checked Foretravel's B2035 Schematic and our 1993 U300 has different locations for the fuses than their schematic does. You might check the label on the flip up dash top to make sure yours are the same as ours. I don't see a DDEC fuse label on the B-2035 schematic. And ours only has one fuse for the ECM.

Pierce

Re: Detroit 6v92 died

Reply #24 –
So what I am understanding is that the ECM fuse blew because it was undersized, it had a 5 amp fuse where it should have been a 10 amp fuse.  You had my undivided attention when you posted it just died driving down the road.  That crosses my mind a lot when you 7 or 8 hundred miles from home. Dennis

Re: Detroit 6v92 died

Reply #25 –
Here is the fuse location chart for the U300. Taking a test drive with a 5 amp fuse installed sound like a good way to sell a new ECU. I've worked for dealers as a kid, a big reason I never take a vehicle into a shop. Sure looks as if it calls for a 10 amp to me, especially since there is a 10 amp installed. They agree 100%

So, we have the same 6V-92TA Detroit with the same DDEC II ECU. Does the coach in question have the same location placard with the same fuse rating? If so, why was a 5 amp fuse installed for a test drive. I may not be Perry Mason but...

Pierce

Re: Detroit 6v92 died

Reply #26 –
Pierce
Our fuse panels are the same it has a 10 amp for the ddec. I believe the 5 amp fuse in question is lead 439 in ddec wiring which by chart says ignition.

Ken

Re: Detroit 6v92 died

Reply #27 –
Ken,

I see the fuse in the schematic on reply #20. Looks like it goes to the ignition as you said and has to do with the low coolant level module and the cruise control. I take it that the low coolant module is in the ECM itself? Is it located in the fuse location map in reply #25?

Looks like I may have to eat some crow pie as far as S&S goes. :D

Here is the complete DDEC II troubleshooting manual in PDF format: https://ia803107.us.archive.org/4/items/detroitdieselddeciidiagnostictroubleshootingguide6se4891986ocr442pages/Detroit%20Diesel%20-%20DDEC%20II%20Diagnostic%20Troubleshooting%20Guide%20-%206SE489%20-%201986%20-%20OCR%20-%20442%20pages.pdf

This PDF might be good to download for 6V-92TA owners.

Pierce

Re: Detroit 6v92 died

Reply #28 –
442 pages! Hope I never need it!  :o

Thanks for posting...I think...

see ya
ken

Re: Detroit 6v92 died

Reply #30 –
All is fixed and good to go. Stewart Stevenson found that the ecm was bad. Replaced with rebuilt.
 

Re: Detroit 6v92 died

Reply #32 –
Quote from: kpbowser –
All is fixed and good to go. Stewart Stevenson found that the ecm was bad. Replaced with rebuilt.
$? Part and labor? I see the DDEC II available for rebuilding for $500 with used outright for $1000. Detroit DDEC2 ECM ECU Repair Service LIFETIME Warranty!! | eBay

Another company advertising 6V-92 DDEC II exchanges for $1295: Detroit Diesel DDEC 2 ECM – Re-manufactured - Detroit Diesel ECM

Pierce