Question about 2002 Jeep Grand Cherokee

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93 jeep grand cherokee ecu short

While replacing bad pins on my ecu connector two shorted, now jeep will not work. I was an Elecronics Tech, then Electrical Engineer so I am willing to do some work. but need help.

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  • Jeep Master
  • 1,615 Answers

Unshort the shorted circuit.

Posted on Nov 19, 2013

  • Troy Lehto
    Troy Lehto Nov 19, 2013

    since part of the plastic melted I am replacing the connector with all

  • Troy Lehto
    Troy Lehto Nov 19, 2013

    sorry, all good pins. Hope the ecu will work. The replacement pins were the correct iner diameter. but are loose in the socket. Even after I pushed them on manually the Jeep would not start. Any thoughts on repairing ecu or just buy a new used one?

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SOURCE: my jeep grand cherokee started overheating at idle

try the water pump - first - make sure the radiator is really full - take the cap off cold and fill - if it looks full - start and run 8 minutes or so - then fill it up - look at ur fan belt - is it tight - tight is about how much pressure u use to make a firm hand shake with little movement - any movement over about an inch is loose - when the jeep warms up the belt can slip and not even make a noise - - new materials don't always squeal. - then be sure ur water pump is ok - they go slowing - the fins wear down - one more thing is the radiator - u don't say how many miles or what maintenance schedules you have or not so that's it for now

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SOURCE: 1999 jeep grand Cherokee Laredo a/c electric fan

There is a resistor mounted by the fan, this could have burned out. Look on passenger side right by fan motor should be 2 screews that have 5-6 wires pluged into it had to replace mine once fan only on high worth looking in too. Also, check if the blower motor Resistor Harness was faulty.

Good luck.

Posted on May 21, 2010

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1 Answer

My 2005 jeep 4.0l has dtc 2302 , hesitates, replaced pcm still has code


replacing PCM is the last, why do that. which jeep,? wrangler? GC?
ECU is not bad and is almost always (GIGO) garbage in ,nets garbage out, now and for ever....
all most all errors are
1: input errors.
2: or bad output actuators or gee the engine it self.


now lets work
2302
ever see this>? or the FSM, the FSM book is way cheaper than any knee jerk ECU swap.. ouch.
http://engine-codes.com/p2302.html
out of FSM. actual
(F342) ASD OUTPUT CIRCUIT
(K19) COIL CONTROL 1 CIRCUIT OPEN
(K19) COIL CONTROL 1 CIRCUIT SHORTED TO GROUND
COIL
PCM (last ) never 1st ever....
so the coil pack is 4 pins and 3 coils, one one is hot key on.
the other 3 are 3 coils, coil 1 is bad,,
from a pure tech stand point its.
1: bad coil (open or shorted) bad wires, open or shorted or bad ECU.
we never condemn any ECU unless we do the simple lamp tests.
etc. case in point below.
here are the FSM steps, so easy to do.... (truncated, read your FSM)
1: coil 1 removed, connector.
key on is pin 2, 12v, if no fix that first. ( bad power distra. or fuse)
yes, 12v. so.
then, use a test lamp to pin 3 and ground
Pin 3 is COIL 1, !
crank car , does light flash? (any small 12v lamp works) 0.1 amps are less.
1: yes, flash PCM good, coil bad.
no?
test lamp tests continue....
2: stuck on lamp , wire is grounded out or bad PCM (pull PCM C2 conn, ? still tuck on?, yes, bad harness !
3: stuck lamp off? . this is harness wire cut or PCM bad.-
check continuity end to end on this wire. if good , bad ECU.
on a car with nice clean harnesses, no damage to conn?
its a bad coil.
the coil can in fact can be bench tested...
that to, is in the books.
(ohms tests, and make real spark) do so but do not exceed max dwell on the coil "smoke tested boom."( you need a pulse generator , or coil tester)
easy to make them .
there you go.... ECU last. for ever and ever.....

Sep 27, 2013 | Jeep Cars & Trucks

1 Answer

93 jeep cherokee, will not start, not getting fuel...if i unhook the negative cable to the battery it will start after waiting a half hour or so to hook the cable back up.


If the check engine light does NOT come on when cranking at the times when it won't start, then your ECU is in need of repair. The engine will only start after the check engine light comes on and the ecu is what controls that. It's likely going bad, causing the delayed start problem typical of early 90's jeeps. Repair or replacement services for your jeep ECU are available on ebay.

Jul 01, 2012 | 1995 Jeep Grand Cherokee

1 Answer

I have a code 41 on my 93 grand chorkee 5.2 4x4


Fault Code 41

Description: Alternator field control circuit open or shorted
Power loss light: Off
Limp-in mode: None

Possible Causes
* Bad connection or wiring - Check the wiring and connections between the logic module and the power module. Clean and regrease any corroded connectors with dielectric grease and repair any shorts.

* Bad voltage regulator circuit - See Diagnosing Your Charging System

Diagnostic Method:
* Trigger Parameters
- Near 0V or near 12V not detected when the field coil driver is turned on or off, respectively

* Results If Component Fails
Fault code 41 is stored. If the condition persists, it will eventually result in a fault code 46 or 47.


Good luck.

Apr 12, 2011 | 1993 Jeep Grand Cherokee

1 Answer

95 grand cherokee no start, it turns over but won;t start, trying to find the pcm connector pin out diagram


If you don't have a check engine light that lights up on the dash when you turn your ignition key to on, then your ecu has gone bad, internally.

Nov 04, 2010 | 1995 Jeep Grand Cherokee

1 Answer

93 grand cherokee had engine replaced. new engine did not have oil sensor attached. display always shows the sensor is bad and to check the oil. i have attempted 2x to go on long highway trips and between...


You can defeat the oil level sensor by shorting the connector. Use a thick paper clip or other wire shaped in a "U" to connect the terminals in the plug. For the other problem, we will need trouble codes. Is the engine light on?

Oct 04, 2010 | 1993 Jeep Grand Cherokee

2 Answers

On a 97 jeep grand cherokee, which wire coming


Should be pin 27 in the black connector on computer.

Jun 22, 2010 | 1997 Jeep Grand Cherokee

1 Answer

My 93 jeep grand cherokee service 4wd switch is on. what does this mean ?


Hey there, The driver info center in the 93 grand cherokee's is notorious for this message. This switch is on the transfer case and its only purpose is to tell that display what 4 wheel drive mode you are in (eg. 2 wheel, 4 wheel high, 4 wheel low, etc.) This can mean the switch bad but is USUALLY cause by a short in the display module itself. This will not affect anything on your Jeep. It is merely for driver information only. This is a very common problem and if you have a 93 in which the display is working at all your are lucky. They are very bad about going completely out over time.

Jan 03, 2010 | 1993 Jeep Grand Cherokee

1 Answer

Trans/ecu fuse


disconnect the plugs that go into the transmission,and see if the short goes away.an oil leak can do amazing things to connectors.
salt can corrode them and cause a short.
30 amps is 360 watts of power.something small would smoke.

Mar 30, 2009 | 1994 Jeep Grand Cherokee

3 Answers

Interior lights staying on in 93 jeep grand cherokee


Check the door jam switch or the fuse, you could have a short or the switch needs to be replaced....

Mar 28, 2009 | 1993 Jeep Grand Cherokee

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