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  #1  
Old 01-19-2013, 06:17 AM
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control module testing

Working on an 03 f250 4x4 on the fly. When turning switch nothing happens. Shift motor is good, I can control it from the relays by grounding. I replaced the 4x4 control module with a used one with same numbers but didn't work. I'm thinking that module is also bad. Is there and way to test the module to be sure. any ideas ?
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Old 01-21-2013, 05:12 AM
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Is there anybody out there?
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Old 01-21-2013, 05:17 AM
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Re: control module testing

Are your vents blowing through defrost when you switch to 4x4? There is a ton of info about this in the drivetrain section.

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Old 01-21-2013, 05:39 AM
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Haven't checked.
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Old 01-21-2013, 05:44 AM
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Re: control module testing

Quote:
Originally Posted by midnite View Post
Haven't checked.
If so, it is likely related to a vacuum leak, with esof. Could be bad hoses, or hub seals.

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Old 01-21-2013, 05:51 AM
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Has manual hubs
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Old 01-21-2013, 06:03 AM
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Re: control module testing

Quote:
Originally Posted by midnite View Post
Has manual hubs
Your first post says 4x4 on the fly, are they after market hubs? Has it worked in the past?

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Old 01-21-2013, 02:18 PM
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Yes hubs were switched. Has worked in the past.
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Old 01-21-2013, 02:39 PM
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Re: control module testing

Sorry, i'm not familiar with the module test. I've seen quite a few threads on the drivetrain section.

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  #10  
Old 01-21-2013, 04:21 PM
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does the 4x4 light up on the instrument cluster when you put it into 4 high?
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