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  #1 (permalink)  
Old 12-13-2012, 07:00 PM
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Default DF250 Error Codes

I have a pair of new to me 2005 DF250's. both ran fine for first 50 miles and then i got a steady red check engine light and a single beep every 5 seconds. The engine still ran ok except it didnt like to idle and would die after starting when i shifted into gear.
Any ideas?
Thanks.
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Old 12-15-2012, 10:05 AM
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Probably a low battery voltage alarm.
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Old 12-15-2012, 12:25 PM
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I checked voltage when running during error codes and voltage was over 14 on gages. When not running, i checked with volt meter and they are 12.7 or higher.
Got any other ideas?
Thanks.
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Old 12-15-2012, 01:42 PM
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Do both engines flash the same codes?
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Old 12-15-2012, 01:50 PM
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no. just port engine. Engine sounds same as starboard when running at 4500 rpm. Thanks.
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Old 12-15-2012, 04:01 PM
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I see the port engine check engine light flashing 3-1. What does that mean?
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Old 12-15-2012, 07:35 PM
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3-1 code........IAC valve/bypass air adjustment. Looks like that's your problem.
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Old 12-15-2012, 10:19 PM
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Ok. Thanks for help. Just exactly what do I do? To correct it?
Got any excerpts from a manual that I can refer to?
Thanks. I looked for an online manual to download but my virus scanner said the ones I found, were infected.
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Old 12-16-2012, 12:46 AM
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The IAC is a linear soleniod plunger type located on the intake manifold, the purpose is to control the amount of intake air flowing from the IAC passage. The IAC valve is driven by the duty cycle signal from the ECM.

You might want to check the electrical ceonnections, if found OK, you will need to verify that air passages are not plugged or that the soleniod valve is OK.

There is also a procedure for adjusting the air flow bypass that control tidle speed.

Good lock in finding your problem.
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Old 12-16-2012, 06:01 AM
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Much appreciated. I will check on it next time i run it. is there an exploded view someplace so i can determine what I am looking at?
Thanks again.
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