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Old 06-20-2014, 03:11 PM   #1
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Fault Code and help

I have a 2005 Coachmen Cross Country with a Freightliner Chassis and Cummins engine. I started getting an intermittent check engine light on our way back from Florida and noticed some black smoke exiting the exhaust when the light would come on. The light would then go off and everything would be normal.

When driving through towns, this was more prevalent and the black smoke was most noticeable. I did notice some slight hesitation at times, but not every time the check engine would come on.

My coach has a trip computer which also has the ability to give me diagnostic info and fault codes.

I accessed the fault codes and researched them on-line with no luck. I called Cummins and Freightliner, and they were unable to help with the codes.

Here is the engine information:

MODEL NUMBER: ISB-300
SERIAL NUMBER: 57274714
BUILD DATE: OCT 14 2004
ENG. CONFIG. #: D403061BV04
CPL #: CPL8123


Here is exactly how the codes are displayed on my screen:

FAULT 1
SPN - 20433 CM 1
OUT OF CALIBRATION
FMI 12 OC 1

FAULT 2
SPN - 20433 CM 1
CURRENT OPEN OR BELOW NORMAL RNG
FMI 5 OC 22

FAULT 3
SPN - 2001 CM 1
OUT OF CALIBRATION
FMI 13 OC 4

FAULT 4
CAB INTERIOR TMP
SPN - 2001 CM 1
CURRENT OPEN OR BELOW NORMAL RNG
FMI 5 OC 127

I do understand the following:

SPN - Suspect Parameter Number
FMI Failure Mode Identifier
OC Occurrence Count

I am suspecting the Turbo Speed Sensor or the Turbo Actuator Position Sensor.

Any help would be greatly appreciated.

Thanks !!
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Old 06-21-2014, 09:51 PM   #2
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SPN - 20433 CM 1
20433 doesn't seem to be a valid SPN for J1939 data.
I think the problem with understanding the codes is that CM(Conversion Method) is set to "1" instead of "0". This is the method that your trip computer uses to convert all the 1's and 0's on the J1939 data bus to a SPN.

What make\model is your trip computer?

Does it have the option to change the CM from 0 to 1?
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Old 06-25-2014, 09:24 AM   #3
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I believe it to be the older Medallion Information Center that Freightliner liner installed on the XC chassis (mine is a 2004 chassis).

I will check to see if I can change the conversion method.

Thanks for the information.
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Old 06-25-2014, 10:50 AM   #4
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when pulling all the wiring out of my same RV as yours i did find it had have 2 data bus systems

your motor and trans and ABS all run off the new system but i forgot what the older bus was and where it was going

i just remember some where there was 2 systems


i could be thinking the small round plug under your dash at the brake pedal
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Old 07-01-2014, 03:06 PM   #5
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HELP!

Okay, here is what I have after several days of checking and rechecking.

After getting the SPN codes that did not exist, I started looking at the symptoms that I was getting.

During checking what was going on, I noticed that when I would start the engine, I would get a check engine light (CEL) and I would notice about 5 thumping sound coming from the exhaust and this would repeat about every 5 seconds. I then turned the key on, but did not crank the engine over, at this point, I could here a mechanical clacking sound instead of the thumping sound that occurred at the same frequency. I went back to the engine and noticed that the VGT actuator was cycling about 5 times every 5 seconds or so.

I checked the SPN and FMI codes at this time and they seemed to be a valid code.

SPN 641 FMI 5 (Fault code 2383)
VGT Actuator Driver Circuit - Current Below Normal or Open Circuit


(Note: I did not find any way to change the conversion method as suggested in an earlier post.

I took the motorhome out for a drive and each time the thumping sound in the exhaust would occur, I would see black smoke. No thumping, no smoke.

I let the coach cool down and then turned the key to the on position and I got the following code.

SPN 2795 FMI 13 (Fault code 2388)
VGT Position Sensor Circuit - Out of Calibration

I let the coach set a while and then turned the key to the on position again and I got the follow codes. I could not find any existence for either of these on the Cummins Quickserve site.

SPN 4143 FMI 5

SPN 4143 FMI 13

Do I have an ECM problem?
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Old 07-01-2014, 04:41 PM   #6
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I had the same problem,first changed electric lift pump(check pressure they are known to give problems )and then changed the Turbo, the controller on turbo was shot,had engine coolant in it,turbo is cooled by engine coolant,cheaper in usa than here in Canada After all that no more codes.
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Old 07-01-2014, 05:22 PM   #7
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Freightliner or Cummins (or both) should be able to give you an explanation of what the fault codes mean.
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Old 07-01-2014, 08:51 PM   #8
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I checked with both Cummins and Freightliner and neither one new what the codes were. They both said that the codes did not exist.
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Old 07-01-2014, 11:35 PM   #9
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Quote:
Originally Posted by countryheart View Post
I had the same problem,first changed electric lift pump(check pressure they are known to give problems )and then changed the Turbo, the controller on turbo was shot,had engine coolant in it,turbo is cooled by engine coolant,cheaper in usa than here in Canada After all that no more codes.
I own a
2005 coachmen crosscountry 5.9 engine when you turn the key on the ECM runs a check on all the systems including the VRT (turbo).If its not sounding righ maybe its your problem
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