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Old 09-22-2014, 02:32 PM   #1
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check engine light but no fault code !!!

Ok, so as the title says, check engine light but no fault code.
mainly going up hill, engine temp around 200 cannot see where problem can be... would the tranny trigger the engine check light but not show codes because the codes are linked to the engine.....Any Ideas
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Old 09-22-2014, 02:42 PM   #2
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Ok, so as the title says, check engine light but no fault code.
mainly going up hill, engine temp around 200 cannot see where problem can be... would the tranny trigger the engine check light but not show codes because the codes are linked to the engine.....Any Ideas
How are you checking codes?
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Old 09-22-2014, 02:47 PM   #3
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the Freightliner service center checked for them, and i after i found i could look on the dash readout, ( not sure how reliable that is though) and none there either..
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Old 09-22-2014, 02:49 PM   #4
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Was not aware that you could check them on dash ... I had to get Cummins to pull mine
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Old 09-22-2014, 02:51 PM   #5
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Are you really loaded up. Have you gone over scale lately.
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Old 09-22-2014, 02:55 PM   #6
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Was not aware that you could check them on dash ... I had to get Cummins to pull mine
yep i was hitting bunch of buttons and it came up...
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Old 09-22-2014, 02:56 PM   #7
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yep i was hitting bunch of buttons and it came up...
and not loaded at all empty on fresh water and black and grey and 1/2 tank of gas..
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Old 09-22-2014, 03:40 PM   #8
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On most new encoder systems after a fault code is detected it is storied in temporary file then moved to the fault file and storied until repaired and reset. If fault clears its self before moving to fault file it will be deleted from temporary file. The temp may be going up and causing the fault light to come on then cooling back down before it leaves the temporary file there by not storing fault. In looking at the fault file on my Ford F350 it does a reset of temporary file every 32 bit of line code.
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Old 09-22-2014, 04:36 PM   #9
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When my tranny computer went out the check engine light came on. A message also showed "trans comm fail". So yes, I can believe the check engine light can come on when it's a tranny problem.
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Old 09-22-2014, 04:59 PM   #10
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When my tranny computer went out the check engine light came on. A message also showed "trans comm fail". So yes, I can believe the check engine light can come on when it's a tranny problem.
This could possible be a connection between the tranny computer and the encoder system. I would check the connections between them, the only reason I could see a comm link fail is do to open link, not to say that the encoder could have a problem reading the tranny computer but not likely if it has every work before, odds are you have lost connection somewhere.
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