old66tiger

All,

Over the past several weeks, I have been conversing with Scott from TTI to obtain the part numbers for the GM PWM Fan Module connector. Scott at TTI was very helpful and was able to track down most of the part numbers with very little trouble. The small PWM signal terminal was hard to find and luckily for me, Andrew B used his local GM resource to track down this terminal. We are still in the process of prototyping a few of the small terminals to find the best one of the bunch. So...I have not fully tested all of these part numbers, but will share my experience when I get everything together. Most, if not all, of these parts are available in single piece quantities through Mouser. I believe that information like this should be free to the public.

Body (Qty 1)
478-9440101
$8.58

Large Terminal (Qty 4)
478-23124472620060
$3.45

Large Terminal Seal (Qty 4)
478-10800472742091
$0.77

Small Terminal Seal (Qty 1)
478-10800444522091
$0.10

Small terminal plug (Qty 1)
478-10800472631091
$0.12

Small Terminal (Qty 1)
We are Prototyping these Options - Stay tuned:
478-22124492060050
478-22140492060050
478-22140472970050
571-925595-2
571-2-964286-1

Project GatTagO

iTrader: (7)

Thanks for doing this Bob. I don't think most people understand how hard this was to find.

Andrew

old66tiger

I forgot to mention awhile back, the preferred small terminal part is Mouser part # 571-2-964286-1. I just looked and Mouser only sells large quantities at this time. It is a TE part so you can either try to get a sample or just go to Digikey and they sell individuals. The TE part number is 2-964286-1. Gold contacts, double lock

The alternate is Mouser # 571-925595-2. No gold contacts and a single lock.

Either will work.

JacobJ

This is very helpful, thank you! I gave up on this months ago and installed a dumbed down radiator probe fan controller because I couldn't figure out the parts.

JayinMI

So this fits a PWM fan control module? From any particular gen motor, or is it stand alone, or ???

Jay

old66tiger

C6 Corvette fan controller. Search out my build for my 66 GTO. You must have a factory production ECM (E38 for sure and I believe E67 will work) as the GM crate ECM will not put out a PWM signal.

JayinMI

Thanks for the refresher. Now I remember about that.

Pop N Wood

iTrader: (1)

Why not just use the cheaper controller?

https://ls1tech.com/forums/conversio...connector.html

old66tiger

Besides the connector cost, I've bought C6 controllers off ebay for $40 new. Sounds pretty cheap to me for PWM fan control. Maybe I just got lucky. Besides, I don't trust much of anything that Chrysler makes to go the distance.

Pop N Wood

iTrader: (1)

Interesting. From what I've read the C6 controller has a bit of a rep for melting.

I just bought one of the Dorman Chrysler units with the pigtail from Walmart for $41 delivered. From what I can tell it does the same thing as the vette unit.

https://www.walmart.com/ip/Dorman-90...y-Kit/42917469

Going to use it to make a variable speed fuel pump controller. Was going to use a Chinee made hobbist unit I got from ebay for $8 but hoping this OEM unit is more industrialized.

LSswap

Here's some additional PWM fan info for the Vette module as well as the Mazda module.
PWM Fan Controllers

old66tiger

The good thing about this site is that there is always more than one way to achieve your overall goal!. I bought 2 fan controllers on the cheap so I have one for each fan. Given the limited draw for each fan, I doubt I'll ever experience anything melting or overloading.

LSswap

All the threads if found said a separate connector that supplied 12V to the C6 fan module melted. I didn't see any where the fan module melted.

https://www.corvetteforum.com/forums...nnector-2.html


Very cool. If you get detail info on how it works and what it takes to drive it, I'd be curious to find out. I'm especially curious if it does it's own ramping up and down or it does exactly what you tell it. Frequencies, pulse voltage, min and max duty cycles, etc..

Project GatTagO

iTrader: (7)

If I was a betting man, which I am, I would put money on the cause of the failure. The C6 fan should not be configured to more than 90% duty cycle. I bet some "tuner" decided 100% is better, and as a result, parts started to fail. I've had a C6 controller on my Cougar for 3 years and it works perfectly.

The connector to the fan controller (3 cavity: power, ground and pwm signal) is a Metripack 630 series (rated to 45 amps, as I recall). I can't imagine it failing either, unless the "tuner" changed stuff in the config.

Andrew

Project GatTagO

iTrader: (7)

If the Chrysler controller works like the C6 controller, it is not going to react quickly enough for a fuel pump. The ramping of the speed is very gentle, which is good for a fan, but not good for a fuel pump.

Andrew

LSswap

I don't think it is any of the connectors touching the module that fail, just other ones before the module.

The 90 to 100% duty is a definite fail, but not the smoke and melting kind. It just tells the module to shut down. so 90% = 100% of the fan. more than 90% = turn fan off. People put 90-100 percent and think the module is broken. It's just working as designed, not as you expected. I wouldn't even go near 90, it's stay at 85 just to be on the safe side.

Pop N Wood

iTrader: (1)

I'm speculating the controller is really just an amplifier that turns on and off at whatever rate the input signal does. If that is true speed changes are controlled completely by the ECM varying the duty cycle. I will run it off an Ardunio to find out.

Project GatTagO

iTrader: (7)

That is all true. What I'm saying is when a higher duty cycle is commanded, there is a delay. This delay is too long for a fuel pump. By the time the fuel pump speeds up, the engine will go lean. I have a video on my YouTube channel showing the C6 controller and you can see how long the delay is.

Andrew

Pop N Wood

iTrader: (1)

Good info. I'll bet a beer the delay is due to the programming in the ECM. I will post back what I find once I get the part but I'm guessing the output duty cycle = the input duty cycle. The part is just a solid state relay.

By the way I want this to cut the pump noise on a carb'd motor that has a return style regulator. I'm talking a quick or quiet type manual switch, maybe have it change speed with engine RPM. But if this works like I think it will there is no reason why it couldn't be used with a FI system. Add a pressure sensor and see if the thing can be tuned to keep a constant pressure. Might be scary to trust an arduino for something like that but entertaining non the less.

Project GatTagO

iTrader: (7)

Im afraid you would loose a beer, because I use the C6 fan controller with a Holley Dominator ECU, not a stock computer. I can also tell you that, at least, the C6 controller is way more complicated that a SSR.

Andrew