Jeremy Porter

My fan quit working, last night I replaced the ccrm and the fan. The fuse 50amp is new as well. Directly hooked up the fan works great. I dont see or smell burned wires. I tested the volts on the ccrm as one thread said. The pins 1 and 2 have nothing but 12v on 3 and 4 and 6 and 7. Anyone have any ideas?

Urambo Tauro

Welcome!

What's the engine temperature when you're checking these pins for voltage?

Jeremy Porter

It was a hair hotter then it should have been. A.c. was also on max.

Urambo Tauro

Well I don't know what the differences are in CCRMs between years, but if your CCRM's pinouts are anything like on my '95, pins 1 & 2 are for LOW speed fan output, pins 3 & 4 are your 12V+ for the fan relays, and pins 6 & 7 are for HIGH speed fan output. (Hopefully someone can confirm this for whatever year your car is.)

If you're not getting low-speed fan voltage from the CCRM, you might have a bad CCRM, PCM or a wiring issue. But if your new fan isn't working at all, despite working great when directly hooked up to power, then you should probably check the ground circuit.

08'MustangDude

Have you verified the relays are even working?

Urambo Tauro

(That's what he was doing. He was checking for power at the pins for the "non-serviceable" relays that are integrated into the CCRM.)

Jeremy Porter

I went ahead and tested my pins and 1 and 2 didn't show older got them, 3 and 4 had 12v and 6 and 7 didn't have anything. I took pin 46 on my pcm and grounded it out to a switch to bypass the ccrm and that didn't work. I had the ccrm replaced again and didn't work. The fan works fine hooked to power. Maybe my computer isn't working right?

WhiteFoxGT

Lets start from scratch. Where on this chart do you have/dont have power/ground?

Jeremy Porter

I'll be home in about 8 hours I'll retest then and let you know. Thanks. Best diagram o have seen and not aware the 39 amp forget breaker fuse was apart of the cooling fan.

Jeremy Porter

not sure where to start? Fuse is good and has power to it. The fan hooked up to a 12v sourse works great. What's the best way to test these?