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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2006 - 2009 TrailBlazer SS Tech > 06-09 SS Engine and Drivetrain > Engine Tunes/Mods

Engine Tunes/Mods Engine tuning and/or modifications

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Old 04-10-2007, 11:49 PM
[email protected] alvin@pcmofnc is offline
PCMForLess.com - Sponsor
2007 Chevy TrailBlazer SS (3SS)
Summit White 6.0L LS2 V8 2WD
Join Date: Aug 2006
Location: Mooresvill NC
Posts: 877
Originally Posted by matts View Post
my tune is locked...so no go on that. BUT i wouldn't rule out buying your harness and providing my own fans and then sending my computer back to where i bought the tune and having them fix it.

i'm ready for some e-fans

contact me one on one.. I offer some incentives for people to switch over to our tuning

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Tuning, Battery Cable Upgrades, intakes, e-fan kits, transmission cooler kits and more!
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Old 04-11-2007, 12:00 AM
GMtb42's Avatar
GMtb42 GMtb42 is offline
2006 Chevy TrailBlazer LS
Light Pewter Metallic 4.2L I6 2WD
Join Date: Mar 2007
Location: Texas , Google Map pixel
Posts: 106
Originally Posted by GMtb42 View Post
I have not got around playing with the TB PCM yet but in a truck the PCM commands the fans from two pins , pin33 and pin42 , both are ground so you use them to trigger a relay to activate the fans . I think from what I read the TB uses something similar in that the PCM triggers the fan clutch in different stages .
But not getting the 5v pulse to the fan clutch sensor is what trips the MIL for DTC , so I would think at least two wires are for speed control (-12v) and one for 5v (+5v) pulse and (-5v) ground , and the other maybe system hot (+12v) .
Kind of like a MAF , they use a 5v pulse for the readings .
Maybe someone more knowledgeable than me can comment .
A little something I designed for a truck and the 05 truck fans .
Going to check out the TB this weekend a see what the fan clutch wires do .

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