2003 Jeep Wrangler Logo
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MICHAEL FRASER Posted on May 26, 2016
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ASD FUSE BLOWS, BUT ONLY WHEN DRIVING. Jeep WILL IDLE ALL DAY WITHOUT IT BLOWING.

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  • Ryan Nierman
    Ryan Nierman May 26, 2016

    Year, make, model, & engine?

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  • Jeep Master 20,706 Answers
  • Posted on May 26, 2016
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Which engine? 4.0L? which trans, stick or a/t?
can you show the location of the fuse exactly.
each fuse has number and the schematics show only the F number.
is the fuse in the front PDC box, under hood>?
PDC fuse F9 blows, 30amp fuse???? no lower.

need exact fuse to wax smart, i do not have the oper guide that shows, names.
1: wires to it or to PCM shorted that line.
2:PCM bad.
3: OR SOME THING CONNECTted to PCM is shorted.
finding intermittent can be hard, i use, tools that allow me monitor those lines, an ammeter (clamps on wires) id check for wire damage first.
things that can overload the PCM are:
the Alternator Field source pin,
the ISC motor.
both 0xy sensors the heater can not be shorted.
the speed control servo,
in all cases wires too not shorted.
its not the injectors it has its own fuse f28
all comments usa car and guess 4L
now my wild guess, the 02 wires are melted and touching hot exhaust, seen vast times.


ASD FUSE BLOWS, BUT ONLY WHEN DRIVING. Jeep WILL I - cdf1860f-ec82-4bbb-927b-df72f4890453.jpg

26205181-amf5aouhxldxtc45alxb1aff-5-2.jpg

  • _-__-___-_
    _-__-___-_ May 26, 2016

    the PCM sources current to the 02 heaters
    then measures it.
    so ever scan the PCM r to see if the 02 heaters fail??????????
    not scanning , most modern cars is a fail.
    the newer the car the bigger the fail.

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what fuse number located where? photos work here,!''
with that , we can tell all possible ways.
which box, JB or PDC?
which fuse in what box. the under hood box>?
id let the other guys, Insurance fix this car, really, after all its all on his nickle. (GRIN)
PDC F20
this is called S100 feed.
s100 feeds the ASD and ECU. (and wires to same that can short)

fuses blow for a short, if the wire is shorted to ground
or the modules connected short.
or the wrong fuse, used, 20amp is correct not 10.


26182114-t33w3bbgpyh0vajlnsh4jf0p-5-0.jpg

26182114-t33w3bbgpyh0vajlnsh4jf0p-5-1.jpgthis fuse in under the hood in the PDC box.
and goes only 2 places, unless car was hacked, as many are this old.

fuse blow for a short on a power feed
and if there was no fuse the the wires catch fire.
fire near fuel, is never fun.
so the fuse blows.
and is a short. to ground on the fuse that blew.
no fuse number stated,

see pdc below tell me what fuse blew using the FSM
fuse box drawing. we can work form there.easy26182114-04vedhgfugfdfyrc0edesdha-4-3.jpg
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