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Isuzu Trooper Warning Lights and Gauges

joalamjoalam Posts: 1
ABS light is ON, for a while it came and went, now it seems on all the time.

I read on this forum about a way to check for diag codes. Can someone relist the procedure, and what I am looking for. Where exactly do I find connecters #4 and #12 to jumper them.

Also, how are the diag codes read? is it a matter of counting the blinks?

I have seen something in my center console before, behind the break handle, had no idea what it was, now i know that this is probably the G sensor. Thanks to this forum.

Finally, how to reset codes for a 98.

Fluid level OK, car breaks OK. Auto Tranny, TOD. 160k miles.



  • I have a 1989 Isuzu Trooper with 215k miles on it. 2.6 liter 4 cylinder, 5 speed manual. A beater, but up to now reasonably reliable.

    For several months the "Check Engine" light has been coming on intermittently. The car briefly runs kind of doggy & won't accelerate, then light goes out and things go back to normal.

    The other night I was driving home & a bunch of idiot lights came on all at once: low fuel warning (tank is full), O2 sensor, alternator & brake warning lights, & check engine. I made it home but when I try to start car, it starts, runs for about ten seconds with all of aformentioned lights glowing, then check engine light goes out and it dies.

    I did a computer code check and got reading of 44,mixture lean, check O2 sensor. I replaced O2 sensor and fuel pressure regulator (new) and ignition module and computer (used). Fuel pump pumps fuel into a can when I take hose off. Still the same symptom: start, run 10 seconds, die.

    Staring at wiring diagram I see the glowing idiot lights all run off the same fuse, which I have replaced. It seems to me there must be some electrical short that is affecting all these lights and possibly also some sensor or the computer. Anyone have any suggestions?
  • atfdmikeatfdmike Posts: 414
    It has been said before, but bears repeating. A multitude of idiot lights in an Isuzu can indicate a failing alternator or other electrical problem. Often, a fault code will register due to the electrical failure of another sensor or switch due to the voltage fluctuations. Might want to get the alternator checked out?? One guys opinion.
  • My husband and I are missionaries working in Costa Rica (CR). We were so happy to finally be able to by a Trooper with adequate size and 4x4 to help with our work. When we purchased the Trooper a month ago, the O2 light was on and the seller, who imported the car from FL, indicated he didn't know what it was/meant... but it had not caused it to fail CR vehicle inspection... therefore it must not be too troublesome.

    As the car did not come with owners manual and we have been unsuccessful in finding either the owners or repair manuals online for our referral... I was so happy to discover this website and all y'alls "wealth of knowledge"! Can anyone explain the O2 light, its importance, and its risks if not fixed? Does anyone know where I can locate a FREE, or next to free, owners manual or repair manual... preferably online as it is too hard to ship to CR. Thank you in advance for your help with keeping these Missionaries "on the road"! Robyn
  • steverstever Posts: 52,683
    Check the links in the Online Repair Manuals guide and Where To Find Your Car Owner's Manual Online. Most of the free repair links are US centric, but maybe one or two will help out.
  • atfdmikeatfdmike Posts: 414
    Briefly, the Trooper is pre programmed to remind you to change the O2 sensors after certain mileage. To reset, follow the links Steve posted, but briefly you have to remove the instrument cluster (remove dash bezel first)and looking on the back of it find the small phillips screw and move it the the other position marked with either an A or B if my memory serves me. Then simply reinstall it. Leaving the light on will not cause any other problems, unless the O2 sensor is indeed in need of repair (replacement, really), in which case the emissions will be out of spec and may cause a variety of conditions like engine stumbling, idle speed and gas consumption to name a few. Good owners opinion.
  • I've a 1997 trooper. Shifted from 4L to 4H (in neutral), then into 2 wheel drive but the dashboard four-wheel light stayed on. It's in 2WD cause I can spin the rear wheels. I shift back to 4WD and it works cause I can't spin the rear wheels with the same torque supplied. The front drive axle turns whether in 4 or 2WD, should it? Could it just be a bad 4WD dash light sender?
  • paisanpaisan Posts: 21,181
    Yes the front axles will always turn, regardless of if the Shift on the Fly is engaged or not. It sounds like the light sensor is bad.

  • my abs light comes on in my murcury mountaineer every now and then I notice when my battery water was low because of a leaky cell so I got a new battery and it came on about a week later I'm just wandering what else could be the problem
  • My '94 Isuzu Trooper S (3.2 lt, V6 SOHC) has 105K miles on it. It is the perfect SUV. Battery was flat, I jump started and drove. Everything was perfect for the first 80 miles. Then instrument panel problems emerged. All Gauges stopped working intermittently for 1 or 2 seconds at a time and kept coming back to normal. I kept driving the next day. Instrument panel Gauges completely stopped working. Both signal arrows on the panel are lighted up (but dimmed light up). But External signal lights are working perfectly.
    I kept driving. Then engine started stalling on slow speeds and at traffic light stops. I kept jump starting and driving, starts OK. Hardly returned back to home. I put a new battery, but the problem persists.
    - Did I burn the computer chip?
    - Did I blow a fuse? How can I diagnose? What is wrong, how can I fix it? Check engine light NEVER come up.
  • paisanpaisan Posts: 21,181
    It should be the alternator. :)

  • atfdmikeatfdmike Posts: 414
    I agree with Paisan, the alternator died, quit charging the battery, and battery drained. Sounds like classic alt failure. My 94 did the same thing. No CEL but other warnings sure did....just the wrong ones. One idiosyncrasy of the electrical system when alt blows is the heater blower motor will NOT come on for any reason, even when engine runs. I had this condition too, and read other posts where this is a symptom.
    Hope this helps.
  • I have a 94 trooper with 167,000 miles. it runs great and is super reliable. I bought it last year from a one time owner, and it came with a tow package and wiring harness. the trooper doesnt have a tow switch like newer suv's, and i read the manual and it didnt say much about hauling trailers, but whenever i hook up my small enclosed trailer to my trooper and accelerate, the check engine light comes on. then when i come to a stop it turns off. My trailer meets the weight standards for pulling it by quite a bit. Not sure if i should switch my automatic into a lower gear, or any other ideas. the engine also seems to run a little harder. what risks do i take by continuing this. is there anything i can do to stop prevent this?
  • hi i have a 95 trooper limited and while im driving it the power from the battery will surge and all my lights will start flashing what is this problem?
  • atfdmikeatfdmike Posts: 414
    Ok, lets take this a step at a time. Do you mean the warning lights on the dash or your driving lights and dash lights. Does this happen only at night when the driving lights are on, or anytime.
    Have you cleaned the battery posts lately? Had any work done on the vehicle where something may have been disturbed?
    How do you mean {"surge"?? Are you seeing this on the battery gauge or do you mean that the power comes and goes?
    Does your blower motor quit when this happens, if you don't know, try to determine as that is a symptom of electrical problems that can lead to diagnosis.
  • this problem doesnt only happen at night it happens during the day also no i havnt cleaned my posts lately but i definatley will now.
    oh and when i say surge i mean the battery gauge goes all the way to the max, the transmission will gear down,the transmission light will come on and some more lights on the dash will come on but then it will go away after a while.
    and when you say blower motor what do you mean?
  • atfdmikeatfdmike Posts: 414
    A common indicator of a bad alternator is that the dash lights go crazy and more than one light up, and the HVAC blower fan will not operate if the alternator is not putting out power. Just one of those idiosyncracies Isuzu owners live with. Alternators can be notorious for the problems they can cause when bad, and in an Isuzu, since the trans is electronic, it will also cause it to act up.
    Bad alt if you don't find an obvious bad terminal or cable. Not cheap but easy fix .
  • thank you very much for the help and i will let you know how this goes
  • My 93 Trooper has a light that flashes on and off on the dash that indicates the letters U and S. Does anyone know what that means?
  • I just purchased a 94 Trooper with 148K miles on it. It is in pretty good shape and with a little bit of TLC and some of the suggestions that I have already read here I think it can be in great shape without a whole lot of effort.

    There is one thing however that is bugging me to no end. The upshift light that comes on the dash when you are driving... I will admit that I don't pay it much attention as I am working my way up through the gears, but the what bugs me is once get to 5th.
    Once I am in 5th gear and at my cruising speed, the light stays on constantly. It's like the car thinks that I have a 6th gear or something like that.

    Obviously this does not effect the drivability of the vehicle, but I find myself driving down the road, glancing at the light and getting stressed out about the whole situation.

    Has anyone ever heard of something like this and have an idea of where I would start to get it fixed?

    I am definately not a mechanic, but if its not too terribly hard to fix I can usually at least get it done.

    Any insight would be appreciated.

    Thank you.

  • I see someone posted the same problem I have with this light. I reach cruising speed in 5th and the light comes on. I had no idea what is was for because I never got an owners manual with the used vehicle here in Belize.

    At least now I know what it means! :)
  • atfdmikeatfdmike Posts: 414
    Hi, I don't have a manual trans, but it seems to me this problem has surfaced before. As I understand it there are two switches on the trans that work in conjunction to illuminate the upshift lights, one of them for two gears, the other for the other two, and both either on or off (again, don't remember) for 5th gear. Try a search here or on another Isuzu forum if you don't find it here. Good luck.
  • The 4 wheel drive wont engage and the check light keeps flashing? what causes this?
  • atfdmikeatfdmike Posts: 414
    What year is your Trooper? Do you have TOD?
  • iTs a 2000 trooper,, and it does have TOD.
  • atfdmikeatfdmike Posts: 414
    Well, I am no expert on the TOD system, but I know it only works in 4High Drive. In 4low the 4WD system locks the Tcase 50/50 front and rear. Try putting it in 4 LO and see if it goes into 4LO and actually is working, and whether the flashing stops and light indicates 4WD. This will help isolate where the problem may lie. If the light stays on and indicates 4WD is engaged, then I would look at the TOD system for the problem, or front axle actuator, if it has one. If it does not go into 4LO, then suspect Tcase problem.....not too likely though, I think. I don't know if TOD has the shift on the fly front axle, but if it does, then if the actuator is not working it will cause flashing to indicate that failure. If your front axle has a vacuum actuator on it then it is SOTF. I know that is common problem on SOTF..IF vacuum hose gets knocked off or valve sticks, then no 4WD.. Hope this helps. Good luck.
  • paisanpaisan Posts: 21,181
    All the TOD equipped models have SOTF.

    Check the 4-low and see if it engages. If it doesn't then it's likely the SOTF vaccum or the unit itself. I left mine in AWD mode for a whole winter and when I tried to put it in 2wd, it wouldn't work. Same error message. Turned out because I hadn't changed mode (2wd -> AWD/4wd) the lube dried up and the unit siezed.

    Motorsports and Modifications Host
  • Hi all. I have an '01 Trooper LS 4x4 my wife and I bought used in February. Today I took it to a local Car-X to get the muffler & shocks replaced. The fella at Car-X told me someone had replaced the stock muffler with a cheap round canister type muffler. He said he had a "Walker" brand muffler that was the correct replacement. I told him to go for it. While working on it, he came out and mentioned that the previous owner had also cut out a resonator that went in the exhaust pipe ahead of the muffler. The new muffler came with one, and he guaranteed it would be quieter. So I started my Trooper up, and yes, it was much quieter outside. On the drive home, however, I noticed as I idled down approaching a stop, and accelerated leaving, there was more noise inside, and I could feel more vibration in the floor. I also noticed my "Check" light for the transmission flashing continuously. If I let off the gas and coasted, or shifted to neutral at a stop, it quit flashing. As soon as I took off, it would start flashing again. I went home, ate lunch, and then drove back to Car-X, with Trooper showing same symptoms. They put it back up on the rack, said they couldn't see any problems, and tried scanning for fault codes, and couldn't find any [said I had to go to my Isuzu dealer]. I took it to AutoZone, and they couldn't find any fault codes either. My wife took the Trooper out tonight, complained about the interior noise, and said she didn't think it had as much power when accelerating off the ramp to get on the interstate.

    There are no leaks in the transmission or transfer case. ATF in transfer case still looks a healthy, clean red color. Anyone run across a situation like this or have any suggestions???
  • pooper1pooper1 Posts: 1
    My TOD is "working", that is, it does come out of AWD - but the dash lights never recognize it, and eventually the error light flashes. It had the engine completely rebuilt, and sat idle for about 3 months waiting for that, but it was in 2WD when it went into the shop. Any ideas?
  • atfdmikeatfdmike Posts: 414
    Sounds like it could be the switch on the front axle not responding when the axle shifts out of engaged position. Try unplugging it and see if the indicator light goes off, although I am by no means an expert on the TOD system. I am going by the fact that all the front switch does is indicate the status of the axle and you say it is disengaging properly......HTH
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