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Isuzu Trooper Check Engine Light



  • atfdmikeatfdmike Posts: 414
    There is a 3 wire pigtail located on the hump on the driver side just where the console meets the carpet and is usually tucked under the carpet. Just follow the carpet end til you meet the console and it should be in there. You jumper the right two wires and turn on the ignition key and the CEL will flash the codes it has stored, one after the other if there are multiple, and repeat a couple more times IIRC.
  • Hi,

    I am new to this forum and found this very helpful..... I have one question though..
    I have 2002 Trooper which runs perfectly fine, but from last month and a half I noticed that CHECK light is keep coming up, its right under TOD sign, its not the constant but keep coming now and then. sometime when I start engine it stay there and flashing then I turned-off and turned back on then it goes away.

    Any idea what is it for, I will really appreciate your help.
  • atfdmikeatfdmike Posts: 414
    When the Check light comes on, there is also a code stored in the computer, which can be read by a OBDll code reader. Autozone and most part stores will read it for free. Get the name AND the code number and that will give you specific reason for light. Then you can research possible remedies. Hope this helps. One guys opinion.
  • I have a manual 98 Trooper and for the last two months the "Check Engine" light has been coming on and it's been difficult to diagnose the problem. Whatever the code that AutoZone provided only scratched the surface. My local mechanic has replaced: mass air flow sensor, manifold air pressure sensor, throttle position sensor, idle control valve, fuel filter, and fuel injectors. All of these electronics have to do with emissions, I have been told. What a nightmare. This will be the last time I ever buy a manual 4x4 of any kind. Too many parts, and the kicker is that this was all electronics that control the moving parts, the moving parts, for the most part, are fine! Having a good mechanic who can take the time to diagnose these issues is a lifesaver. Don't let a lesser mechanic brush off these problems.
  • i have a 2002 model isuzu trooper skyroof edition my problem is after doing the change oil the indicator for check trans is keep on flashing and the unit won't start. the engine is 4jx1 isuzu. :sick:
  • tonight check engine/check transmission light came on while in cruise control. Got home tried to reset by disconnecting battery waiting ten minutes. This did not work infact now the shifter indicator on dash and shifter read different gears dash says 2 and floor says D cycled through and dash does not show gear even when im in drive tried to drive it and it seems to clunk when upshifting and down shifting I just bought this 02 rodeo LSE truck a week ago. Please help!
  • atfdmikeatfdmike Posts: 414
    The trans is an electronically controlled trans so any check trans light will be accompanied by a diagnostic trouble code in memory. Since you unhooked battery youmay have erased the original code, but since you are still having problems, I think your mode switch on the trans shifter input shaft is dirty, damaged or broken. This is a common problem as it is exposed to all the dirt, dust and crud the underbody sees. The mode switch has to be installed properly and work properly or your symptoms are the usual evidence......dash reads one gear and shifter lever indicates another. This will also result in screwed up shifting when it is not working right. This is where I would first check under the circumstances you describe.

    Check this out:
  • i just bought this 94 trooper 3.2 dual overhead cam.. it has 117,000 miles one it.. anyhow my check engine light comes on when i hit highway speeds, then when i stop it comes off, take off again it comes back on.. then the next day it stays off till i hit the highway speed again.. if i just run around town at slower speeds it dont come on.. so i replaced the tps and that didnt fix it.. So i am not sure what it could be.. just strange how it comes on only at highway speed. any suggestions??? Also in the morning when i first start it, it starts right up then i smell fuel till it warms up.. once its warmed up it has a little trouble starting.
  • atfdmikeatfdmike Posts: 414
    There is a code stored in memory of the ECU when the CEL comes on. I am betting it is 32 based on your symptoms. That is an EGR code, and the valve needs to be checked for function, but likely the tube is carboned up in the plenum if cleaning and checking the valve does not resolve the problem. Not too bad a job with a small brass brush like you would use to clean a 22 cal barrel. I would check the EGR valve for function and if it is ok, then clean the manifold passageway. Easy to check codes. The connector is on the hump where the carpet meets the console. It has 3 wires, IIRC, and you jumper two of them and turn on ignition (don't start) and the CEL will flash the stored codes. HTH One guys opinion.
  • heartlanheartlan Posts: 2
    edited May 2010
    1994 Trooper SOHC - One day it just didn't start, no warning signs. Checking to find the problem, I found hole in the radiator and fluid very very low. Have been doing oil changes at Dodge Dealer and they never mentioned the fluid level, just topped it off. I have put an ignition module in and the trooper starts but now have a check engine light that came on, during my five mile test drive, not sure what the code is yet. Will have to go see if I can get that read free somewhere. Would the radiator have some kind of a sensor that might throw a code?
  • atfdmikeatfdmike Posts: 414
    Nah, you have an engine temp sending unit on the crossover pipe on the back of the engine that is very important to the operation of the engine, but would not cause a no start condition. IMO. You have OBD I system, so most code readers may not work, but simple to get codes. The code connector is located where the center console meets the carpet and dash on the driver side. Jumper the connector properly, three wire conncector IIRC and one wire is ground, other dtc. One is not used. turn on the igniton but don't start, and the CEL will flash the codes. Post up if you don't know them. HTH One guys opinion.
  • novice43novice43 Posts: 1
    With no warning, my Trooper would not start this morning. Check Engine light is on. The ignition seems fine. Dashboard lights up. Engine clicks - rapid clicking sound but will not start. Any suggestions? Thanks. :cry:
  • atfdmikeatfdmike Posts: 414
    edited May 2010
    sounds like a weak battery. Leave any accessories, dome light, etc; on overnight? Clicking is starter solenoid trying to engage starter motor. Clean battery terminals, check grounds for good contact, jump and after start check voltage output of generator and have battery checked for capacity. Best case is cleaning will fix problem, worst would be possibly a bad starter, assuming you get the battery and alternator checked and they are OK. HTH One guys opinion.
  • wlbrown9wlbrown9 Posts: 867
    My starter went out about 2 years ago, 2000 Trooper LS that is very similar to the 2002. I came out of the mall and it would not turn over... I did not get the rapid clicking...just on solid click when turning the key. Took battery out and over to Walmart and had them test it. Tested good. Mall security tried to give me a boost and that did not work. Had it towed home. Picked up a rebuilt starter at Napa regional warehouse. Got out the tools and a couple hours later had it swapped out. Turned the key and back in business about 6-7 hours after it failed. IIRC the starter was around $175 so that is not really that much worse than a battery unless you have to pay someone to put it in for you. Good luck.

  • toddswagnertoddswagner Posts: 33
    2001 Isuzu Trooper and CEL is on. I changed the EGR valve, cleaned the port, changed intake gaskets, changed PCV valve, change air filter, changed fuel filter and it still is on. It is very sluggish during initial acceleration. If anyone knows what to do next, let me know, The garage told me to change the main wiring harness for $1,500, but the tech asked me for help in diagnosing it. Let me know, thanks.
  • atfdmikeatfdmike Posts: 414
    What code(s) are in the memory? If you have an CEL and, vehicle won't start, number of different possibilities, so if CEL is lit, must be code and ecm problem. Post it for better help.
  • toddswagnertoddswagner Posts: 33
    I need to take it back to the place that did all the work and see what the codes are. They also cleaned the MAS. Since this things burns so much oil, I haven't changed the Oil Filter in awhile. Could that cause issues? I know it is a stupid question, but I couldn't imaging a dirty oil filter causing the CEL to come on.
  • cope77cope77 Posts: 4
    My ABS light came on. I read the trouble code (43) using the jumper/blink method and was directed to test another relay. Unfortunately, I can't locate the ECBM unit on this vehicle. The 1997 manual shows this under the passenger seat, but it doesn't appear to be under there anywhere. Does anyone know this location?
  • biryanibiryani Posts: 5
    I have Isuzu Trooper 2002 my SUV running fine until 3 days ago then it was just parked in my garage, today when I start my car, it started fine but about after qtr mile I see Engine Check and Reduce Power lights were on and my gas paddle just went free and there was no power when I press gas paddle and car was running like 2 MPH so very slowly I reached home.
    Can anyone tell me whats wrong with my car, its been running fine in fact a month ago it got done complete tuning.
    Any help will be really appreciated.
  • biryanibiryani Posts: 5
    I just made it to the Autozone to get it checked for codes and I got these..

    P1295 - Electronic throttle control power management mode probable codes.
    P1515 - Commanded versus actual throttle position correlation.
    P1125 - Electronic throttle control limited performance mode-two APS faults set.

    My question is... Do these problems fall under power train warrenty ?

    Thanks in advance for any help.
  • biryanibiryani Posts: 5
    One more thing.......Sorry too many questions.....
    I live in Chicago land area, does any one know a good, reliable & cheaper mechanic where I can take my car for fix, I don't want to take it to the dealer because they are a big rip offs.
  • I am having this same problem - but it only occurs when it is above 85* outside. Last August it started, I spent several hundred dollars and several having it trouble shooted and I thought fixed.Would run fine, then have the issues randomly. Replaced 02 sensor, idle control, etc. 3 different shops. Then was told maybe needed to have the fuel injectors cleaned, used Lucas fuel cleaner. Ran great all fall, winter, spring (also rebuilt transmission this spring). Last week it started it again. Very random, doesn't matter if AC is on, it will reduce power. If I pull over and let it sit for about 5 minutes it runs great again. The check engine light will also go off after driving a couple of miles. Anyone else have a solution?
  • biryanibiryani Posts: 5
    Hello All,

    Finally I found out this stupid "REDUCE POWER" light on resolution.
    It comes in only because your battery is start dying, you would think it's working perfectly fine but in reality it just start dying and not sending enough voltage to your ening.
    All other functions will remain working fine untill it really died but for the 4 wheel drive SUVs, voltage has to be on a constant level.
    So, if you see that light start coming either try to recharge your battery or replace it with good one.
    This exactly what happened to my Isuzu Trooper 2002 SUV. Good thing is that mechanic from Isuzu dealer is my friend and he told me about that. So I bought a new battery and go back to dealer and installed it by myself (coz they are charging $200 just for battery and installation) and now there is no more Reduce Power light.
  • I had the same codes displayed and this is what I found. Isuzu moved the ECU into the engine compartment and the wiring is most sensitive. After replacing the TPS (throttle Position Sensor) the problem still occured. You recieve these codes becuase there is a loss in cunductivity within the wire harness in the engine compartment. The connections after time get loose and correded. I pulled apart every connections of the wire harness within the engine compartment, cleaned and made sure they snapped back together. I was told by many mechanics that this is a common problem and most recommend replacing the main wire harness. This is a major job if you do not know what you are doing and the harness itself costs $700+/-. By simply making sure that your connections are solid, they problem will solve itself. My Tropper was down for three weeks, new battery, new TPS and the problem was just the wires. She has been running like new with zero problems.

    I hope you find this helpful. Exhaust all avenues before spending major $$$$. It took me a good hour to make sure alll the connections were cleaned and snapped together. Good luck.
  • What did you clean the connections with? That is what they were going to do last year, replace the main wiring harness. I thought that was ridiculous, so I replaced a bunch of other parts and still have the issue. Let me know what to clean the connections with and I will give it a try. I also experience the engine turning off while the tank is almost empty. I wonder if there is crap in the tank?
  • ikrisbikrisb Posts: 1
    It's located behind the passengers side head light. You will see all the brake lines running into it.
  • 2001 Isuzu trooper check engine light came on and stays on the vehicle runs the same as before is it OK to drive it I'm not sure what to do about it
  • steverstever Posts: 52,683

    Easy first step is to see if a local auto parts shop can pull the codes for free. Then paste them here (assuming some are thrown) and someone may have some suggestions.

  • I have a 2002 Trooper with a 6eV1. Just had the alternator bracket bolt holes on the block rewelded and helicoiled/tapped. Running great but after about 200 miles the CEL came on. I also noticed a faint burning smell coming from beneath the hood, like electrric not oil. Any ideas?
  • toddswagnertoddswagner Posts: 33
    The check engine light is on because you are running 87 octane gas. If you run 93 octane gas for a tankful, it will turn off. I have done this several times to pass emissions. I don't think the 87 octane hurts the engine, but the light comes on. I have a 2001 Isuzu trooper with 138k miles on it.
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