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1991 Jeep Laredo code 27

Tiny
STEVEFACE
  • MEMBER
  • 1991 JEEP GRAND CHEROKEE LAREDO
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 157,000 MILES
I think the number 3 injector has a problem
iam showing a code 27, fule injector control circuit.
is this in the computer/ecm or something.I have replaced the injector and still runs rough. Whats your idea, do I have to replace the computer. Thanks Steve
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Tuesday, March 30th, 2010 AT 6:03 PM

5 Replies

Tiny
BEEF99
  • MEMBER
  • 152 POSTS
Injector control circuit-bank output driver stage does not respond properly to the control signal.

Injectors No. 1, 2 or 3 control circuit and peak current not reached
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Tuesday, March 30th, 2010 AT 7:00 PM
Tiny
STEVEFACE
  • MEMBER
  • 3 POSTS
I think iam learning, were is the control circuit bank driver, can this be replaced or fixed
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Tuesday, March 30th, 2010 AT 7:25 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,133 POSTS
Hi:
I'm going to jump in here. I believe the item you are refering to is part of the PCM. Have you checked to make sure the wiring to the injectors is in good condition and free of corrosion at all connectors?
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Friday, April 2nd, 2010 AT 12:37 PM
Tiny
STEVEFACE
  • MEMBER
  • 3 POSTS
Thanks for your reply, besides from being older no wires are exposed, even factory tape and shields
look very good.I have power to the new injector
conformed with test light. Used stethiscope on the other 5 injectors I can here them but the one is dead
I pulled the plug on the pcm/ecmand claened it
, that was dirty, still runs the same. Thanks JandN
Steve
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Friday, April 2nd, 2010 AT 3:27 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,133 POSTS
It sounds like you made all of the general test. THe last thing to do is remove the PCM and have it checked. Something is telling me that is where the problem is coming from.

You mentioned you are getting power to the (new) injector, is there any chance it is bad? If you switch it with a different injector, does the problem follow it or still stay at the same cylender? (This is just an after tought) If it follows the injector, I would say it is bad. If it stays at the same cylender, I would blame the PCM.

Let me know.
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Friday, April 2nd, 2010 AT 3:42 PM

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