Trooper 1998 fails to shift, think ecu is missing

which engine, ill toss coin, land on v6
check fuses first.
wont crank? that grrrrr grrrrr grrrrr sound
jumper cable start it yet, why not?
or put in a known good charged car battery?
or using any battery charger charge yours?
or buy a new battery, (if rich)

if it cranks and wont start?
check spark x6 (scan it yet?)
if sparks ok try test fuel!
if test fuel fails 100% see bad belt below.

EVER REPLACE THE CAM BELT?
if not and over 60k on the last one
the belt is doomed, living on borrowed time.
got the V6?

no engine stated..
i guess you like to search on rumors?
there is inertial switch. but no country stated nor engine nor drive line.

first check for spark not fuel
the ECU cuts Fuel anytime it sees spark fail (3 ways)
to stop TV like crash and burn,
check for spark if its good x4 or x6 , (depends on engine size)
and if that is good, check that engine runs for 3 seconds on test fuel, if thats good? then we check fueling system.
see?
we have posted this answer on ISUZU vast times.
and not one poster ever once, told what engine is there or they country.
or insert scan too
crank for 5 seconds, Got P03xx codes, that is the BINGO for no starts, right? ever scan a car? its a cheap tool all mech have.
and all savvy DIY have.


here is a power search in fixya.
1200 answers ON TOPIC

https://www.google.com/webhp?gws_rd=ssl#q=isuzu+inertia+site:http://www.fixya.com/

some cars have it, mostly not.
fords have
and is rumored some ISUZU, but not ours.
but ive not had all engine options, on a 1999.

so will look yours up, 1999 and pretend USA model. (not canada)
some isuzu do have this red electric switch
so lets see if the 99 usa has it.
that means if its missing in the pump page, its not there.
drum rollllllll
no switch. 1998 usa trooper.
end easter egg hunt 1200.

the pump runs off the fuel pump relay DIRECT
the relay IS ONLY controlled by the ECU,

sounds like a dirty oil or filter problem. It is taking this long for the viscosity of the oil to change to allow shifting. Run fault codes as well consider having an oil change done on the transmission ( oil colour should be cherry red not tan coloured.)

the name of this transmission is hydrAmatic not hydrOmatic it is made by General Motors , i cant find a reference to g14 ,look for serial number begining TH___ or 4L or 4T as these cover the age of your vehicle

I think you should buy repair manual first for your vehicle after that it will be easy for you to solve the problem. Check the link may be you will find something useful here
1998 2002 Isuzu Trooper Service Repair Workshop Manual DOWNLOAD

Its on the end of the gas pedal and runs to the ECU .

Double check the belts. If the alternator belt has failed, the engine will not run. The alternator is located towards the bottom of the engine, and the pulley is easy to miss, as it is sometimes painted black.

if it runs great...leave it alone and just maintain it, enjoy.

sounds like ABS module fault
its getting signal thinking your driving and an ABS event is happening the ABS ECU comands engine ECU to reduce power(missfire) need to read codes from system to point you in right direction.
ABS sensor?
ABS ECU?
WIRING PROBLEM?
ENGINE ECU?

Its under the plastic covers round the shift levers between the seats.