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I have a 2003 motorhome with ISB Cummins with a check engine…

Customer Question
I have a 2003...

I have a 2003 motorhome with ISB Cummins with a check engine light . Scan tool shows FMI=0 and SID 94 engine cylinder #5 knock sensor . what does that mean?

Mechanic's Assistant: What is the complete model and serial number of your machine?

Unknown I beleive it is a 300 5.9

Mechanic's Assistant: Are you fixing this yourself? What have you tried so far?

Just bought scan tool so have not done anything yet

Mechanic's Assistant: Anything else you want the equipment mechanic to know before I connect you?

Not that i am aware of

Submitted: 9 months ago.Category: RV
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Answered in 16 hours by:
9/15/2017
RV Mechanic: Daniel Wilson,
 replied 9 months ago
Daniel Wilson
Category: RV
Satisfied Customers: 6,769
Experience: Owner at DJ Wilson
Verified

Hi my name is***** give me some time to look up some info on this fault code and follow up

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RV Mechanic: Daniel Wilson,
 replied 9 months ago

what scan tool are you using as 94 for Cummins is fuel pressure. 94-0 is fuel pressure too high. Some scan tools will not match the same code definitions as Cummins.

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RV Mechanic: Daniel Wilson,
 replied 9 months ago

What symptoms are you having?

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Customer reply replied 9 months ago
I have 2 lights a check engine light and an ABS light , the ABS came back as rt side #2 axel and that is not a problem but the Check engine light I was trying to find out what is wrong prior to having it inspected
Customer reply replied 9 months ago
i am not having any symptoms but it will not pass inspection with a check engine light
Customer reply replied 9 months ago
i just purchased the scan tool and dont have the name with me . The motorhome has been sitting for 3 years with only occasionally running engine
RV Mechanic: Daniel Wilson,
 replied 9 months ago

thanks for the update. What scan tool are you using? Just to confirm I would try to use the flash code procedure and get the 3 digit flash code using the cruise or diagnostic switch to flash the engine light and count the flashes for the code digits

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Customer reply replied 9 months ago
i can try that but I am at work now so it will have to be later I tried it before but couldnt find a diagnostic switch and it didnt work but you replied cruise switch can you explaine
RV Mechanic: Daniel Wilson,
 replied 9 months ago

We can follow up and post as needed. Key on cruise on, hold set resume until the check engine light flashes. Count the flashes for the 3 digit code. *** pause**pause * then a longer pause between codes. It will repeat until the switch is turned to the off position. So in this example it would be a 321 flash code.... Let me know what you get or if successful.

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Customer reply replied 9 months ago
I will try it and also get the name of the scan tool
RV Mechanic: Daniel Wilson,
 replied 9 months ago

Sounds good

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Customer reply replied 9 months ago
I tried the cruise but it didn't work there are 2 9 pin connections so i used the rear one which is actually the front of the engine(diesel pusher)and got these results SPN0094 OCCURRENCE COUNT =1 FMI=16 data valid but above normal operating range-moderately severe level SPN 94 ENGINE FUEL DELIVERY PRESSURE page2 SAME INFO page 3FM= 13 OUT OF CALIBRATION SPN 641 ENGINE VARIABLE GEOMETRY TUBOCHARGER ACTUATOR #1
So am I looking at a turbo problem and a high pressure pump problem
the scan tool is a iCarsoft HD1
RV Mechanic: Daniel Wilson,
 replied 9 months ago

Thanks for the update. The VGT turbo calibration can only be done with Cummins Insite software. Check the turbo for problems and damage and verify it spins freely without drag and the vanes for the VGT move freely and are not excessively built up with carbon causing them to stick and the actuator moves fully in both directions. Check the fuel system for leaks and restrictions and possibly for a faulty pump

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Customer reply replied 9 months ago
which pump lift or high pressure
RV Mechanic: Daniel Wilson,
 replied 9 months ago

That will depend on if you have confirmed a supply pressure problem or not

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Customer reply replied 9 months ago
not sure how or where to place pressure gauge nor what the pressures should be
i dont mind taking it somewhere but i dont need to be overcharged or ripped off . if a cummins shop does this what should charge range be
RV Mechanic: Daniel Wilson,
 replied 9 months ago

Click on this link.

Troubleshooting

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RV Mechanic: Daniel Wilson,
 replied 9 months ago

 Fuel inlet restrictions
 Fuel filter plugging
 Excessive air in the fuel
 Loss of prime during cranking
 Low fuel lift pump pressure (automotive/marine engines)
 Stuck or restricted electronic fuel control actuator
 System return (excessive return flow from the injectors, high-pressure pump, or rail
pressure relief valve)
 Tampering.

This should only be an hour or two diagnostic time for an experienced technician if that depending how far he has to go into the testing to isolate the problem. Could run a bit more if there are other complications or problems found. then whatever the repair time is.

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Customer reply replied 9 months ago
the engine seems to start and run fine but i cant road test till i replace tires(dry rot) from what i described do you feel engine is basically sound as it only has 31000 miles on it but has been sitting a long time
RV Mechanic: Daniel Wilson,
 replied 9 months ago

Thanks for the update. If the actual pressures are in spec it is possible for there to be a sensor or wiring issue giving false readings. Or possible an ECM software issue needing updates. Check for that.

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