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Old 05-31-2019, 09:53 PM   #1
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Packed & ready to pull out and then.....

after 20 minutes or so of engine idling, solid check engine light comes on. Engine temp appears normal.

Half an hour later the Onan dies. One A/C unit was the only draw and I let it rest for awhile and when restarted it ran for 5 minutes and died again. The dash switch repeated 3 blinks. Does the dash switch offer other codes or do I have to use the switch that's on the gen itself?

Both were serviced at Oasis 3 weeks & 40 miles ago - fuel / oil filters etc.
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Old 05-31-2019, 10:12 PM   #2
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Fault codes and how to read them for the Onan start on page 41.

https://www.norwall.com/product_pdfs...015.pdf#page33
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Old 05-31-2019, 10:16 PM   #3
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Packed & ready to pull out and then.....

The switch for the Onan will display fault codes:

6.2 Fault Codes
The generator set control contains extensive diagnostics to detect shutdown faults. Following a fault shutdown, the control indicates the fault code by flashing the numeric code on the status indicator in the control switch.
Determine the fault code as follows:
• 1 flash indicates a high engine coolant temperature.
• 2 flashes indicates a low oil pressure fault (Code 2 fault).
• 3 flashes indicates a service fault (Code 3 fault).

Press STOP/PRIME on the control switch once to have the 2-digit service fault code flash.
The 2-digit code consists of two sets of flashes. The first set is of flashes represents the 10s digit of the code. After a brief pause, the second digit of the code flashes representing the unit digit of the code. This is followed by a long pause before repeating the flashing of the fault code.

For example, Fault Code 36 appears as: blink-blink-blink—pause—blink-blink-blink- blink-blink-blink—long pause—repeat
Press STOP/PRIME to stop flashing the fault code.
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Old 05-31-2019, 10:47 PM   #4
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I couldn't get a code using the dash switch but did get code 36 using the one on the gen. Can't be fuel level, there's 75 gal there. Air filter should be good, only about 50 hours on it but I'll check in the AM. Thanks.
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Old 05-31-2019, 10:57 PM   #5
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You can check some engine codes via the LBCU on the dash

BTW, I have read that it may display an error code for idling the engine too long. I believe freightliner recommends no more than 10 minutes idling.
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Old 05-31-2019, 11:31 PM   #6
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I've looked at the LBCU instructions a dozen times & get the parts except for how to get to the diagnostics section but I'm going to look again at my print out chart. Maybe it is the idle time although I drove about 1/2 mile before parking it (more stuff to load) and during that time the light did not go out. Can't say I got up enough speed. Test drive in the AM. Thanks.
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Old 06-01-2019, 12:04 AM   #7
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Also read that 3 cycles of the engine will turn off the excessive idle display. Don't know if it's all true.
I'll see if I can help get you started on the diagnostics in the next post. It'll be from memory,
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Old 06-01-2019, 12:11 AM   #8
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1. Turn on key, engine off.
2. Toggle joystick left to turn off Checklist display.
3. Hold joystick right for more than 5 seconds.
4. Scroll down to diagnostics.
5. Toggle right to enter diagnostics.

That's about all I remember so I hope it gets you started.
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Old 06-01-2019, 12:13 AM   #9
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Thanks for your help Dan. I'll give it a try in the morning.
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Old 06-01-2019, 06:49 AM   #10
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Engine Fault 1 of 1
SPN 3031 FMI 2 OC 1

Now I have to find out what that means.
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