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Fan quit working. Ccrm and fan is new. Help

Old 05-04-2018, 07:14 AM
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Jeremy Porter
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Default Fan quit working. Ccrm and fan is new. Help

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?
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Old 05-04-2018, 10:29 AM
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Urambo Tauro
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Welcome!

What's the engine temperature when you're checking these pins for voltage?
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Old 05-04-2018, 11:52 AM
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Jeremy Porter
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It was a hair hotter then it should have been. A.c. was also on max.
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Old 05-04-2018, 01:07 PM
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Urambo Tauro
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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.
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Old 05-04-2018, 01:28 PM
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08'MustangDude
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Have you verified the relays are even working?
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Old 05-04-2018, 09:28 PM
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Urambo Tauro
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(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.)
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Old 05-09-2018, 07:33 AM
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Jeremy Porter
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Default Relays are good.

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?
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Old 05-09-2018, 11:00 AM
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WhiteFoxGT
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Lets start from scratch. Where on this chart do you have/dont have power/ground?


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Old 05-09-2018, 11:31 AM
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Jeremy Porter
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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.
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Old 05-09-2018, 06:32 PM
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Jeremy Porter
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Originally Posted by WhiteFoxGT View Post
Lets start from scratch. Where on this chart do you have/dont have power/ground?


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?
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