1996 Mercury Sable Cooling fans don't turn on.

Tiny
JOEYD32
  • MEMBER
  • 1996 MERCURY SABLE
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 115,000 MILES
Cooling fans won't turn on. Here's what I've done so far;

1. Replaced ECT sensor.
2. Disconnected CCR Module and verified the following;
(a) pin #8 had 12Volts
(b) pin #24 has no power
(c) no continuity between pin #8 & #24 on the control module
(d) good ground on pin #15
(e) pin 13 has 12V w/switch

I found info that says I should see about 1.4mega ohms between pin 13 (battery power) and pin 15 (ground) on the CCRM. I found.944 mega ohms on a cheap meter, so I don't know how accurate it is.

And here is the interesting thing. When I unplug the ECT sensor while the car is running, the fans turn on! Does that mean the CCRM is working? If so, then maybe there is a problem between the PCM and the CCRM? I'm trying figure out how the PCM signals the CCRM to turn on the fans. I bought a Chilton book, but it doesn't say. If I knew, I could apply the signal manually to the CCRM and see if it turns on the fans and then I could assume the PCM isn't sending the signal.
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Monday, March 17th, 2008 AT 5:40 PM

3 Replies

Tiny
2CEXPT
  • EXPERT
Sounds more like the CCRM. The PCM has to see the input signal from the ECT to get the fan going-

Might want to have the CCRM pulled for codes-Not only that the CCRM powers the cooling fan it also powers the fuel pump and AC magnetic clutch-


https://www.2carpros.com/forum/automotive_pictures/12900_cf1_2.jpg




https://www.2carpros.com/forum/automotive_pictures/12900_cf2_2.jpg

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Monday, March 17th, 2008 AT 6:37 PM
Tiny
JOEYD32
  • MEMBER
How would I verify the signal is getting to the PCM from the ECT to trigger the fans?
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Monday, March 17th, 2008 AT 8:28 PM
Tiny
2CEXPT
  • EXPERT
Test the PCM pin outs see below-Did you test the ECT?


https://www.2carpros.com/forum/automotive_pictures/12900_ect_3.jpg




https://www.2carpros.com/forum/automotive_pictures/12900_hedfect_1.jpg




https://www.2carpros.com/forum/automotive_pictures/12900_ect_testing_1.gif



Expect a reading from 0.8-1.2 volts for most cars.
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Tuesday, March 18th, 2008 AT 3:09 AM

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