Engine/transmission programming dilemma for GM truck

[Steve Bryant]

I'm not sure, but I'd be glad to help you figure it out.

All my best,

Steve

[GMPX]

Dang, you guys are just full of information! This PWM fan control has my interest. If I come up with the proper solid state switching circuitry to modulate the fan power, will my 2002 truck PCM support this feature? What pin numbers on the PCM would I use for this feature or the series/parallel fan wiring setup?

Sorry, PWM fans were on 2003+, which is a different PCM to the 2002.

Cheers,
Ross

[wait4me]

ive looked thru every computer wiring output for every 2002 and down truck and it must be a software switch that has to be turned on to make a numbered wire turn into a fan turn on output switch. it would be a negative signal from the pcm, so maybe, if it is in the system and just not printed anywhere, you could set the fans to come on at 50 degrees, so you would know it should be on, and then probe all the unused pins on the pcm to see if they are a switched ground output and then verify it with scanner and turn the fans on and off and it should show that on the test light...?? unless it would be the same output as a camaro or corvette pcm? i guess ill look more... jes

[SinisterSS]

2005 trucks have electric fans, my 2003 still has the 'old-fashioned' off the water pump.

Would be nice to find a 2005 truck and "suck its brains" to get the factory fan settings.

Can we rename the "Read calibration button" to that Paul?

[SinisterSS]

For an electric fan retrofit, I think you'll find this thread interesting...

Fans on Silverado SS Forum

[Blacky]

2005 trucks have electric fans, my 2003 still has the 'old-fashioned' off the water pump.

Would be nice to find a 2005 truck and "suck its brains" to get the factory fan settings.

Can we rename the "Read calibration button" to that Paul?

Can you imagine the panicky support calls we would get if the button was called "Suck its brains"?

Paul

[GMPX]

Would be nice to find a 2005 truck and "suck its brains" to get the factory fan settings.

You'd be dissapointed Rick (well for a short while), it's the same O.S as your CTS-V!!.

Cheers,
Ross