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P0481 help please...

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Old 10-26-2010, 01:37 PM
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Question P0481 help please...

I've ran into a wall here. The relays are both good, and i've borrowed a good pcm. My haynes manual doesn't have a diagram for the cooling fan system. All I can see is that a dark blue wire runs from the pcm to the 2/3 relay. Is there one wire for each relay, 2 and 3, that runs to the pcm, or just one for both relays?
Old 10-27-2010, 12:01 PM
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bad fan clutch (internal short)?have you checked for voltage and ground after the fan?
Old 10-27-2010, 03:29 PM
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Not yet. The low speed still works fine, check anyway?? It probably doesn't matter, but when I try to manually command them on with hptuners I dont hear a click at the relays like I do for the low speeds..obviously. If I had a diagram and could see where all the damn wires run from the 2/3 relays it would help, versus having to pull **** apart and trace wires.
Old 10-28-2010, 12:53 AM
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is this for your truck? or the z??

if one of the speeds works thenground should be good, because i believe they have a common ground.
Old 10-28-2010, 08:36 AM
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Originally Posted by THErobertH
is this for your truck? or the z??

if one of the speeds works thenground should be good, because i believe they have a common ground.
Its for my car. Im running the 2001 harness and fuse box under the hood also..
Old 10-30-2010, 07:55 PM
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I checked continuity on the blue 2/3 relay wire from the plug by the pcm to both on the fuse block, nothing. Guess I have a break somewhere in the signal wire. Simple enough fix..
Old 10-30-2010, 08:57 PM
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Originally Posted by Kevin01Z28
Its for my car. Im running the 2001 harness and fuse box under the hood also..
I have this diagran for the LS1 F-Body. It is for the dual Fan low/high speed.
Hope it helps:
Attached Thumbnails P0481 help please...-cooling-fans.gif  
Old 10-31-2010, 11:23 PM
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Originally Posted by MontecarloDrag
I have this diagran for the LS1 F-Body. It is for the dual Fan low/high speed.
Hope it helps:
The dark blue wire was broke right after they splice together from the relays. Thanks anyway



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