Diagnostic Code 48 - Defender Source
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  #1  
Old September 29th, 2013, 04:30 PM
dsh12
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Daniel Hayes
1994 Defender 90 Soft Top
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Join Date: Aug 2005
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Diagnostic Code 48

My truck is displaying a 48 which, as I understand it, indicates a faulty idle speed stepper motor. Now it only does this when it is cold. Mine touches 2000 rpms before hesitating for about 5 seconds at 1500 then about 1250. It settles in at 1100 and gradually drops to normal idle speed as it warms.

What is the behavior of your D90 on cool, let say 60 degrees, start up?
Could a faulty temp sender cause this?

It has, on occasion, hung out at 2000 and 1500.

Thanks,
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94D90 NAS 3.9 LT77 LT230T Soft Top

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  #2  
Old September 29th, 2013, 04:41 PM
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leastonce
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Jason England
D-90 White 95 SW #65
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sticky stepper ... when it's warm it can move more easily. Give it a clean.
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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  #3  
Old September 29th, 2013, 04:41 PM
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Jymmiejamz
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Jimmy
1995 D90 SW #365
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I would start with a stepper motor since its cheap and easy.
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  #4  
Old September 29th, 2013, 04:43 PM
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leastonce
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Jason England
D-90 White 95 SW #65
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clean it and if that doesn't work the 1986 chevy astro v6 version is the same ... about $40 from your local parts store.
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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