1996 Mercury Cougar car wont start- no power to computer

Tiny
PATRICK CARTER
  • MEMBER
  • 1996 MERCURY COUGAR
  • V8
  • 2WD
  • AUTOMATIC
  • 208,645 MILES
I have a cougar and it cranks fine but wont start. The check engine light will not come on in run position indicating no power to computer. There is a electrical cluster in front of air box that clicks instead. Every now and then it will catch just for a second and then its back to cranking. The high current fuses look okay but could there be a break somewhere beyond sight window? Also jackass mechanics installed heater core and fluid drips from OBD2 connecter in passenger floorboard. This problem has been around way before all the starting problems occured. Just installed new battery and fuel filter.
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Friday, April 25th, 2008 AT 1:43 PM

5 Replies

Tiny
MERLIN2021
  • EXPERT
Try pulling that under hood fuse box and checking for broken or burnt wires, and check the PCM grounds Here are the two you need to check!


http://www.2carpros.com/forum/automotive_pictures/62217_PCM_Gounds_1.jpg


http://www.2carpros.com/forum/automotive_pictures/62217_PCM_Circuit_1.jpg

Check fuse 13 in car fuse panel that's the PCM fuse...
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Friday, April 25th, 2008 AT 2:35 PM
Tiny
MERLIN2021
  • EXPERT
Look in the CCRM for the power relay, if it's NG no power will be supplied the the PCM EEC system!


http://www.2carpros.com/forum/automotive_pictures/62217_PCM_Testinga_1.jpg



http://www.2carpros.com/forum/automotive_pictures/62217_PCM_Testingb_1.jpg



http://www.2carpros.com/forum/automotive_pictures/62217_PCM_Connector_1.jpg

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Friday, April 25th, 2008 AT 3:11 PM
Tiny
PATRICK CARTER
  • MEMBER
I have spare high current fuses so I replaced the pcm fuse with a brand new one and still no start. I'm thinking that maybe the computer got tired of swimming and it shorted but I could be wrong. Is there anything between the two that can be checked? The fuse panel shows no signs of burning and when you open it there isn't wires just fuses and the blades to were they go and still they all look good. This car is driving me insane. What worked for the sixties should never have been changed!
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Friday, April 25th, 2008 AT 4:19 PM
Tiny
MERLIN2021
  • EXPERT
In the power ditribution center, there is a PCM power diode, it looks like a black fuse, check it too see that current can only flow one way. Check several fuses to make sure power is getting to the distribtion center.
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Saturday, April 26th, 2008 AT 5:45 AM
Tiny
COUGAR MASTER
  • MEMBER
The reason you have no power to you computer is because the eec realy could be bad it controals the power to the computer injectors every thing really eec stands for electronic engine controals that mite be bad its in the power distrubution box its the big black realy beside the horn realy withch is green.
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Tuesday, May 24th, 2011 AT 6:39 PM

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