P0481 help please...

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Oct 26, 2010 | 01:37 PM

Kevin01Z28

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From: Plain Dealing, LA

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?

Oct 27, 2010 | 12:01 PM

THErobertH

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From: fresno

bad fan clutch (internal short)?have you checked for voltage and ground after the fan?

Oct 27, 2010 | 03:29 PM

Kevin01Z28

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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.

Oct 28, 2010 | 12:53 AM

THErobertH

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From: fresno

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.

Oct 28, 2010 | 08:36 AM

Kevin01Z28

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From: Plain Dealing, LA

Quote:

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..

Oct 30, 2010 | 07:55 PM

Kevin01Z28

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From: Plain Dealing, LA

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..