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1992 Jeep Wrangler ECM

Tiny
MISALA
  • MEMBER
  • 1992 JEEP WRANGLER
  • 6 CYL
  • 4WD
  • MANUAL
  • 120,000 MILES
We send out the ecm to get rebuilt but still don't start is cranks but don't turn over. The ecm is getting power but theres no power coming out of the ecm to the coil we are not getting a spark I just want to know if the ecm controls the power going to the coil. Also should diagnostic conector have power cause when we put the scanner on it, it doesn't read or turn on my scanner
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Sunday, August 29th, 2010 AT 10:47 AM

20 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
The power for the coil and injectors comes from the ASD relay. The ASD relay is triggered by the ECM.

See if your getting 2 second pulse of power to the coil when the key is first turned on.
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Sunday, August 29th, 2010 AT 11:03 AM
Tiny
MISALA
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  • 12 POSTS
Which terminal on the ecm let the ecm know when the ignition switch is on the on position. Ok I am getting no pulse from the coil does the ecm controls the power to coil
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Sunday, August 29th, 2010 AT 11:22 AM
Tiny
MISALA
  • MEMBER
  • 12 POSTS
What activates the ecm to come on and activate all the relays. We checked all the relays and they are working, as long as we ground them with test light, theres power going into the ecm put its not sending back to any of the relays that it controls
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Sunday, August 29th, 2010 AT 11:30 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
Your not following me. Go to the power wire on either the coil or the injectors on the Dk green with black wire and see if it powers for 2 seconds when the key is turned on.
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Sunday, August 29th, 2010 AT 11:30 AM
Tiny
MISALA
  • MEMBER
  • 12 POSTS
Ok we tseted the wires going to the coil and the injectors there is no power
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Sunday, August 29th, 2010 AT 11:58 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
Go to the ASD relay and remove it. Test to see if you have power at 2 of the terminals with the key on.
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Sunday, August 29th, 2010 AT 12:05 PM
Tiny
MISALA
  • MEMBER
  • 12 POSTS
THERS ONLY BATTERY POWER THE OTHER ENDS ARE DEAD
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Sunday, August 29th, 2010 AT 12:43 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
What I asked is if 2 sockets are powered with the key on.
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Sunday, August 29th, 2010 AT 12:45 PM
Tiny
MISALA
  • MEMBER
  • 12 POSTS
NO, NO POWER AT ALL WITH THE KEY ON OR OFF EXCEPT FOR THE BATTERY POWER
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Sunday, August 29th, 2010 AT 1:00 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
What do you mean by battery power?
Are you testing the relay socket or not?
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Sunday, August 29th, 2010 AT 1:01 PM
Tiny
MISALA
  • MEMBER
  • 12 POSTS
I MEAN I TESTED THE SOCKET WERE THE RELAY GOES AND ONLY ONE SIDE HAS POWER AND ITS COMING FROM THE BATTERY ONLY
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Sunday, August 29th, 2010 AT 1:11 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
Check fuse #8 15amp. That supplies power from the ignition switch to terminal 86 of the relay.
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Sunday, August 29th, 2010 AT 1:17 PM
Tiny
MISALA
  • MEMBER
  • 12 POSTS
WHICH FUSE PANEL INSIDE THE ENGINE OR UNDER THE DASH
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Sunday, August 29th, 2010 AT 1:24 PM
Tiny
MISALA
  • MEMBER
  • 12 POSTS
THE # 8 FUSE IS GOOD BUT THERES NO POWER ON THE TERMINAL 86
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Sunday, August 29th, 2010 AT 1:37 PM
Tiny
WRENCHTECH
  • MECHANIC
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That fuse should be powered from the ignition switch on a yellow coming in and a white with yellow coming out of the fuse in "run" position. Track down the problem.
You could try jumping power to that wire to see if the car starts.
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Sunday, August 29th, 2010 AT 1:42 PM
Tiny
MISALA
  • MEMBER
  • 12 POSTS
Ok we jumped it we got power going to the ecm but still wont start we are not getting no spark to the coil still. We were able to hook the scanner getting code dtc33 a/c cluth wire is open or shorted
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Sunday, August 29th, 2010 AT 2:43 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
Did the ASD relay power up on it's own when you supplied power to it?

This would have sent power to the coil and injectors. Did it?

How long did it stay on?
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Sunday, August 29th, 2010 AT 2:48 PM
Tiny
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  • MEMBER
  • 12 POSTS
Also getting codes 42 and 33
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Sunday, August 29th, 2010 AT 2:50 PM
Tiny
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  • MECHANIC
  • 20,757 POSTS
Resolve your power issue to the ASD relay before going any further.
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Sunday, August 29th, 2010 AT 2:53 PM
Tiny
MISALA
  • MEMBER
  • 12 POSTS
How do reactivate the ASD relay, you think that the fuel pump went bad the shut down the whole system because the ASD relay wires up to the fuel pump relay
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Sunday, August 29th, 2010 AT 2:56 PM

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