Electric fan isn't working - Ford Mustang Forums : Corral.net Mustang Forum
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post #1 of 27 Old 08-04-2016, 06:22 PM Thread Starter
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Electric fan isn't working

Just reinstalled freshly built engine in my 97 cobra. Finally got all the gremlins sorted out and car idling good. Only issue now the electric fan isn't working at all. Tried a known good ccrm and same results. Ran power to fan and verified it was good. Read somewhere by removing the ect connector fan should cycle with key on, but isn't in my case. Tried a/c and defrost settings and still no fan or voltage at fan connection. Not sure if a/c needs to be charged in order for that test to work anyway. All fuses also checked good. When I first turn the key to the run position I can occasionally see the fan bump over an spin just for a second. With the car up to temp still no fan. I looked at ccrm schematic and verified voltages at correct locations. By looking at schematics it looks as if pin 14 or pin 17 on ccrm need grounding from pcm. I tried grounding pin 14 on ccrm with no luck. I was going to try pin 17 ,but it's showing battery voltage on it? Any advice would be greatly appreciated. Thanks


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post #2 of 27 Old 08-04-2016, 07:09 PM
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lets see the diagram


89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #3 of 27 Old 08-04-2016, 08:49 PM Thread Starter
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Here's the schematics I've found that's suppose to be correct. Thanks
Attached Images
File Type: png Screenshot_20160804-002436.png (575.4 KB, 6 views)
File Type: png Screenshot_20160731-193245.png (1,003.1 KB, 2 views)

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post #4 of 27 Old 08-04-2016, 09:00 PM Thread Starter
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I also checked the ccrm using this process. Thanks
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File Type: pdf Anatomy of a 96 Mustang CCRM-R1.pdf (269.7 KB, 4 views)

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post #5 of 27 Old 08-04-2016, 09:42 PM
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using test light to ground

ground pin 28, low speed, and 46 high speed, with key in run, you can leave the ecm connected

report what happens.

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #6 of 27 Old 08-04-2016, 10:11 PM Thread Starter
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Done as you described but used pin 14 and pin 17 at ccrm. Pin 17 has 13.86 vdc to pin 14. Thanks

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post #7 of 27 Old 08-04-2016, 11:58 PM
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you did NOT do as I say

use test light, NOT meter

at ecm pins I asked.

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #8 of 27 Old 08-05-2016, 12:00 AM
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I don't need a potential reading, we need to supply a ground

those volt readings MEAN NO ground is supplied, its open.

My test verifies relay integrity

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #9 of 27 Old 08-05-2016, 12:45 AM Thread Starter
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I'll have to purchase a test light tomorrow. Pretty much your wanting me to go from pin to pin with each end of test light? Thanks

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post #10 of 27 Old 08-05-2016, 09:20 AM
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test light clipped to ground, verify good ground.

the other end, backprobe the pins while the key is in run

what do you think should happen when you do this?


89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #11 of 27 Old 08-05-2016, 09:38 AM Thread Starter
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As long as there is power on the relay this should ground the negative side of the coil.

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post #12 of 27 Old 08-05-2016, 09:57 AM
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and?

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #13 of 27 Old 08-05-2016, 10:12 AM Thread Starter
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It should close the CR. And if alls well fan should energize.

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post #14 of 27 Old 08-05-2016, 12:45 PM Thread Starter
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Got a test light and probed wires as directed. Actually wires are pin 45 &46 on pcm. When probing pin 46 for high speed the CR closed and fan ran on high. Pin 45 there wasn't any change.

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post #15 of 27 Old 08-05-2016, 01:41 PM
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your diagram shows

28 and 46 on the pcm?

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #16 of 27 Old 08-05-2016, 02:27 PM Thread Starter
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Yes. That was incorrect. Ohms back from pin14 on ccrm to pin 45 on pcm and verified. Chilton manual also confirmed pin 45 and 46. Thanks

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post #17 of 27 Old 08-05-2016, 03:18 PM Thread Starter
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Here's the pcm pinout. Schematic is on down in the discussion. Thanks. forums.tccoa.com/7-engine-4-6l-5-4l/142339-96-cobra-pcm-engine-harness-94-bird.html#/topics/142339?page=1&_k=gcfulc

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post #18 of 27 Old 08-05-2016, 03:56 PM
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Link it

On my phone

What is the pinout on your attached pic??

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #19 of 27 Old 08-05-2016, 04:12 PM Thread Starter
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I tried linking it without any luck. I have to copy and paste it in browser to get it to open. It's the complete pcm pinout on the 96. It shows the pin 45 & 46 as being correct. Thanks

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post #20 of 27 Old 08-05-2016, 04:32 PM
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unplug the fan

redo 45 with the test light

check for voltage at the low speed wire that you unplugged from the fan.

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #21 of 27 Old 08-05-2016, 04:47 PM Thread Starter
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No voltage on either of wires at connector when pinning 45. Thanks

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post #22 of 27 Old 08-05-2016, 07:20 PM
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ccrm is done

we can confirm, with a bi-directional test, if you have a good scan tool

we can command low speed, supply power to pin 45 through the test light and if lights, the pcm is providing the ground.

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #23 of 27 Old 08-05-2016, 07:59 PM Thread Starter
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By done your saying bad? I have a sct on my 03 cobra. If the car let's say is up to temp wouldn't we have a ground on pin 45 and be able to confirm? I get what your saying now. I ohmd the ect wires back to the pcm and they checked good. Just tryi g to get in my head what all is needed for pcm to switch ground on pin 45. Thanks

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post #24 of 27 Old 08-05-2016, 09:15 PM Thread Starter
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Got the car running and checked pin 45 and it was showing some continuity to ground and lighting the test light bright. Fan never kicked on. Thanks

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post #25 of 27 Old 08-05-2016, 09:47 PM Thread Starter
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Well, checked connections again and started car. Low speed fan is now working. I touched and wiggled so many connections I'm not sure which one, but I think the culprit was under the air cleaner. I greatly appreciate all the help and your patience with me indy2000. Thanks

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post #26 of 27 Old 08-05-2016, 10:15 PM
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Which connector has the bad connection?

if we ground the relay, and the voltage does not go to the motor,,,,,,,,the ccrm has to be the issue, if you have voltage at the ccrm connector and NOT the motor, the connector is the issue......

I do this troubleshooting for a living........its fairly easy for me,,,,,,,,so no problem.
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post #27 of 27 Old 08-05-2016, 10:41 PM Thread Starter
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I believe it was the round 4 pin connector or might just been a coincidence. I went back through the anatomy of the ccrm I shared a few post above. Using the power probe and checking the low speed relay as described it seemed like it took a little for the relay to energize the coil. After cycling it a few times I reinstalled the ccrm and started.

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