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Isuzu Trooper Check Engine Light



  • 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: 835
    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: 31
    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: 31
    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 YooperlandPosts: 39,984

    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.

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