02 jeep. lib.
so fuse are first. anytime elect fail check fuses;.
stated over 1million time here, and is true.
then what is second, scan it, to see if PCM/TCM knows why.
The TCM (tranny brain will tell you if the TRS is bad, a fact)
all scan tool here in usa scan this car, and tells you why.
the car with a autotmatic trans (is it) has TRS switch
trans range switch.
this switch sends 12vdc to the rear when in REVERSE.
many of these cars have many engine choices, not stated here. nor what trans is there, the trans matches engines.
so.... each trans uses a different TRS,
to diagnose this we use a volt meter, if the TRS has 12v in
and no 12vdc out on the R pin , its bad.
easy no?
why not log into mitchell;s DIY and see the schematic there.
2002 KJ Jeep it is.
i have the book.
ill now guess, that its an usa car, and is automatic.
ok?
3.7liter engine
this trans the TRS is deep in side the trans, must drop trans pan to reach it, so we do all the above first, to avoid guessing and to do that we use a voltmeter to PROVE the TRS is bad
see?
if car is stick shift, is it? the switch is easy, on left side of box.
this is how all cars work , its called drive train if you post not telling that all you get is no anwser or wrong answers
is that good?, I think not.
this is the automatic, see part 5, and now deep that is?
this is pan off, valve body off view....
here is the schematic for 2002
that TRS is burried deep see?
if pin 1 is 12vdc in REVerse
and pin 6 is not, the TRS is TOASTED ! (BAD)
cropped to make it more clear.
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