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99LsSilverado
June 30th, 2011, 01:57 PM
I have a 1999 Chevy Silverado w/5.3 and recently installed efans using Pin42 red and Pin33 Blue. Now knowing that Pin 33 is used already for auto rec. I turned G0106 to Fan #2control. But my issue is with Pin42 is always grounded from the time the truck is running till I turn it off. Now I can turn them off while using the scan tool's DVT. The OS is 09373372. Any help would be appriciated
99LsSilverado
July 1st, 2011, 08:34 AM
Any thoughts on what could be the issue? Do I need to upgrade to a newer O/S like a 2002?
If any more info is needed please let me know.
lq9nissan
July 8th, 2011, 04:34 AM
try system, fans,parameter, G1203 to auxillary if your using pin 42 as an earth to enable a relay, check your turn on/off settings are correct as well.
99LsSilverado
July 8th, 2011, 05:13 AM
I have the fans set up as a series using pin 42 to turn on fan 1 and pin 33 to turn on fan 2 (changed pin33 to fan2 in G0106). Which pin33 works fine when it hits the correct temp. And I followed the same settings as BlackGMC and made sure that the settings are in psi not kpa.
lq9nissan
July 8th, 2011, 05:25 AM
G1203 in system/fans, just check the turn on temperatures are not set 0
Taz
July 8th, 2011, 05:42 AM
Not completely sure how you have the fans wired. OEM used a 3 relay system on 1999-2002 Camaro, and 2005-2007 Gen III trucks. In this system both fans operate on both Fan 1 and Fan 2 - just at different speeds.

Take a look at the thread below ...

http://forum.efilive.com/showthread.php?16557-looking-for-help-with-99-02-series-parallel-fan-control

A 1999-2002 truck OS can be configured to control Fan 1 and Fan 2 based on ECT - but NOT when used with A/C. The A/C pressure settings / pressure switch was not used in trucks until 2003. In a custom / Hot Rod application, swapping in a 1999-2002 Camaro system file (and using an A/C switch from a Camaro) will get the fans working with A/C. In an OEM application, swapping in a Camaro system file will cause compatibility issues with components - the IPC and Park /Neutral switch immediately come to mind.


Regards,
Taz
99LsSilverado
July 8th, 2011, 06:23 AM
I have the fans wired with a 3-relay setup very similar to the 2005 trucks are and fan settings are correct to what they should be.