Howdy, Stranger!

It looks like you're new here. If you want to get involved, click one of these buttons!

Isuzu Owners Maintenance and Repair



  • atfdmikeatfdmike Posts: 414

    I am personally unfamiliar with the TOD system except from what the manual says about it, but I looked up the 1996 model year for Trooper since that is all I have available to me. The book says that TOD was not available in that year for the Trooper. I do not know how a Bighorn compares, but the diesel was not an option either here in the US.
    Sorry and good luck
  • Thanks for coming back to me so quickly - any chance of having a look in subsequent year's manuals or a different model truck/vx to give me a clue as to what error 33 on TOD might be - I suspect that the error codes probably don't change much over time or between models. The scan tool at the local garage couldn't pick up the TOD fault. Thanks again
  • Thanks heaps - I'm sure that armed with this and my multi meter I'll find the problem! Really appreciate the info - very hard to find
  • inigoinigo Posts: 5
    Hello, I am in need of a vacuum diagram, I have looked at the one under the hood but it doesn't seem to cover all the hoses, or I am just to dense to understand it, if anyone has a better diagram or knows where I can get one I would appreciate it, or if someone has an 90 trooper 2.6 efi and could take some pix and send them to me I would really appreciate it.
  • mracermracer Posts: 1
    Does anyone know of one? :) I am trying to buy a 1999 - 2002 trooper and would love to find a mechanic specializing in this car.
  • atfdmikeatfdmike Posts: 414
    Anyone got a laymans terms description of how to adjust the timing belt tensioner on a 94/96 Trooper 3.2 sohc/dohc engine? The manual says how to do it, but cannot figure out what it is describing after looking at the pusher? Help please?
  • Replace the timing belt tensioner when you replace the timing belt. My 1995 Trooper developed a tick like noise that was not from the lifters and it turned out to be the timing belt tensioner going bad. I had changed the timing belt about 20K miles before, I replaced the tensioner and the belt again since it was open.
    The water pump should be changed when the timing belt is changed because the little bit of expense to change the water pump when the front of the engine is all opened up makes it a worthwhile preventive maintenance.
  • wlbrown9wlbrown9 Posts: 867
    How much did you pay to have timing belt and water pump replaced? How much for the water pump? I'm due. I called the dealer here in Memphis and was quoted $800-850 for both. I guess I need to find a local mechanic that will do it. '00 Trooper LS.

  • Timing Belt replacemet was a long time ago for my 1995 Trooper. If I recall correctly, it was something like $400 in labor plus parts, between $500 and $600 total including the timing belt and water pump and new coolant and oil change etc...
    I am a couple thousand miles away from timing belt replacement on my 2001 Trooper. I expect the price to be similar. I will also replace the belt tensioner just in case.
    I use a shop that came into existence to work on Isuzu troopers but they have expanded into more brand names now. They are awsome for their attention to detail and helping prevent expensive repairs by checking for things that typically go bad to catch the problem early. They also are honest.
  • Hi Again,

    I'm getting closer, but haven't quite found the problem yet - I am now starting to suspect that the TOD ECU is not functioning correctly, but not sure. My TOD ECU has only a 20 pin connector, so it doesn't match the 1998 version and so I can't follow the diagnostic process because I don't know the correct pins. Meantime, I have found that the VSV's are definitely not faulty (I checked their operation and compared nominal resistance against your post of service bulletin SB96-04-L006).

    What seems odd is that the voltage on the connectors that plug into the VSV's is 4.95 volts, no matter which mode (4wd/2wd or tod) the truck is in, and no matter which way the axle dissconnect is positioned (engaged or disengaged) - the disconnect indicator switch and the disconnect acuator all work fine (proved by reversing the vacuum hoses and watching the indicator etc).

    Without further documentation, I would have expected the voltage to be 0V when 4WD or TOD is engaged and 12V when 2WD is on. On the 1998 diagram there is no relay inbetween the TOD ECU and the VSV's only a wiring harness.

    Can you find.... a wiring diagram of any Isuzu TOD ECU (Amigo/VX/Rodeo perhaps) with only a 20 pin connector and the associated trouble diagnostic flow charts? and can you confirm what voltage I should expect across the VSV circuit when both VSV's are unplugged. Is there a fuse/relay in the mix, or if the voltage comes straight out of the TOD ECU, could that be faulty???

    An finally - could you please post the diagnostic flow no 12 for error code 32 as well and let me know how to clear the TOD computer memory of faults.

    A massive thank you for your help so far.
  • Oops - mistake in my last post - the TOD ECU Connector has 22 pins not 20
  • atfdmikeatfdmike Posts: 414
    OK, I am kind of lost again. You need a diagram for what number of ECU pin connectors? And you would like the code description for TOD 32?
    As far as clearing the codes, the easiest way I know of is to disconnect the battery for about a minute. A scan tool is needed otherwise, although if you knew which fuse supplied the TOD module, you could remove that for a like period of time to clear the codes.
  • I have a 1994 Trooper. I have replaced the alternator several times. I understand that the alternator is the weak link in this year/model. A short time after I replaced it last time a funny thing started to happen. The blower fan would run after I turned the key off. I have complete wiring diagram and check all the relays and the ignition switch. They all appear to be fine. With the key OUT, the battery connected the fan runs. I can turn it off with switch in the dash (I checked that too). If I pull the restart relay, the fan stops. So I am getting hot to the No.2(or 1) of the restart relay with key off. The best I can tell from the wiring diag's is that is coming for the altenator. Does this sound right?

    If so, can anyone recommend an alternator brand, aftermarket, whatever.

    Oh, if it matters this is a Trooper-S.

  • atfdmikeatfdmike Posts: 414
    Hi, I am far from an electrical expert, but I looked at the wiring schematic, and it seems to me that the restart relay or blower motor relay is the culprit. It may be sticking closed which then supplies power from the alt. to the heater motor, which is always on unless the blower control is in off position, which removes the ground from the blower motor circuit. I think the relay to the side of the restart relay looks like the same type of relay. I did not look to see what it does, but if it is the same, you could swap it to see if that corrects the problem. If it does not, then I suppose the blower relay could be bad. My suggestion hinges on the fact that when you turn the key off, the relays should open so that nothing is energised that should not be. I used the Alldata electrical diagram to look at your trooper. If you have A/C, the compressor may also have power if the A/C button is on as well. The A/C is trickier though, as cold temps or system condition can also be a factor on whether the compressor sees power. Hope this helps. One owners opinion. Good Luck
  • wlbrown9wlbrown9 Posts: 867
    Thanks. When I got the pricing from the Chevy/Isuzu dealer here in Memphis, I got the impression they were not cutting me any slack for having both of them done together. I'm going to stop by an independent shop one day on the way home and see what they might be able to do them for. If I get it done I'll let you know.
  • Thanks, I have checked both (restart & blower relay) of these with a omh meter and putting voltage across the resistor, they seem fine. One of the things I did and did not mention was I disconnected the white (directly from battery) wires at the alternator and the blower stops. My main problem is I cannot tell if that should be hot into the restart relay? In other words is the restart relay always hot on terminal 2? That does not seem right. The way it looks is the restart relay temporarily disrupts power to the blower and AC when the key is on start (starter engaged). But I am far from an expert.

    Thanks for you input.
  • atfdmikeatfdmike Posts: 414
    Hi, like you, I am no expert, but in looking at the schematic available to me, I cannot see the actual settings of the restart relay. Here is a link to the diagram I am looking at for the starter system: - if/page/photo.html#pic

    It shows a black and white wire that should only be hot when the key switch is in start position.

    The restart relay is also shown in the heater/AC schematic, but actually appears twice, I think. Here is another link to what I am looking at: - if/page/photo.html#pic

    For some reason I cannot get the address to post correctly, the .gif is split up. Try to copy and paste into address box and delete the space and hyphen.

    I just cannot wrap my head around where else the blower could get power if not through the blower relay and restart relay. Could the anti theft controller be holding the restart relay on? Maybe someone else will offer an opinion. Good luck.
  • SylviaSylvia Posts: 1,636
    You might want to rename your album and give it a short-name. Go to the album (or a photo in it) and up near the description in an edit link. Click that. You want to change the field from TROOPER FORUM

    to something like -No spaces.
  • atfdmikeatfdmike Posts: 414
    Thanks Sylvia, I changed the album name per your suggestion. I did not know that there was a limit to the number of characters for the link.
    Will previous photo links still take a user to the right place?
    Thanks again.
  • atfdmikeatfdmike Posts: 414
    Answered my own question....nope. So here are new addresses for the most recent posts. Feel free to let me know if you need an older link reestablished.

    Links regarding alternator/blower motor/restart relay ml#pic ml#pic
  • hi, i need help desperately. i am borrowing my moms car, the 93 trooper dohc....
    i was driving last night, when the engine sputtered and died. i let it sit for the night, then checked it out this morning. when you turn the key, the starter kicks in, but the engine wouldnt start. i replaced the fuel filter, since it was an easy cheap thing that needed done anyways.
    after replacing the filter, i tried starting the car. i cranked it several times, for about ten to twenty seconds, to try and make sure the gas lines were full.
    it was trying to start, but then, i turned the ignition off, removed the key, and heard a weird noise....
    it sounded like a vacuum at a car wash. the only way i could get it off was to disconnect the battery. the sound is coming from the front, bottom drivers side of the engine, and i need to know what to do.....
  • I have a 2000 Isuzu Trooper with the 3.5L V6. When I first press down the gas pedal I get some hesitation but if i hold down the gas pedal it smoothes out after a only does this with the initial acceleration like from a dead stop not if i push the pedal down while driving. I have completely removed and cleaned the EGR valve, MAF sensor, and changed plugs and air filter. Also I keep hearing a rattling sound when the engine is cold and i first accelerate but it also goes away after i get some speed up. I crawled under while it was running and checked the exhaust with a glove and didnt seem to find any exhaust leaks, although that is where it sounds like it is coming from.....Can anyone give some suggestions?
  • bahmedbahmed Posts: 66
    You may want to check the Intake Manifold Gasket Leak, a whistling sound comes at cold start if there is any leak, after the engine warms up the leak closes and the sound goes away, this has been observed by many Isuzu users, checking the Fuel filter, using a Fuel Injector cleaner, may help as well.
  • As far as replacing the Intake Gasket....This is my 2nd Trooper first was a 91 but havent had the 2000 very long, is replacing the gasket something that should be done by a professional or can it be done by myself?....I have some mechanic experience but not a whole lot. How should I go about checking the gasket to see if that is it?
  • bahmedbahmed Posts: 66
    Forgot to mention in my previous reply, if you had a Timing Belt change recently, then that is the first suspect, incorrect Timing Belt installation or timing belt jumped and everything is out of timing, a sluggish accelaration from stop to go is primary indication.
    I have heard a leaky Intake Manifold Gasket change is a medium to complex difficulty job, I would reccommend a professional to work on it once it is confirmed. Hope this helps. Check the Transmission Oil level and condition as well.
  • atfdmikeatfdmike Posts: 414
    A word of caution. Cranking the engine for a long period will damage the starter. Personally, cranking more than 20 seconds is a long time. You should wait several minutes before cranking again if you crank that long more than once or twice. In your case, the fuel pump is electric and only runs for two seconds when you first turn on the key. After that, unless the engine builds up oil pressure the fuel pump stays off until you release the key and turn it to off then back to ignition again. Try this several times before cranking, as you may have gotten some air in the lines when changing the filter.
    As to your noise, I can't think of what might be making a noise that does not stop without unhooking the battery. That does not sound like a vacuum leak. Are you sure about the location of the noise? the anti lock brake unit if equipped will cycle periodically but not constantly. When you reconnect the battery, does the noise start up, or only when you try to start the trupr? The fuel pump does make some noise, but should not be running constantly unless the trupr is running. The pump is mounted in the fuel tank in the rear of the vehicle. Hear anything back there? Good idea to have someone listen when you turn the key to on to make sure it is kicking on and off properly. Let us know.
  • atfdmike,

    Thanks for your input. It was the alternator. I took it out and took a jumper to the main connection and was getting 12 volts across the body and the L plug. I took it to an alternator shop they checked one out of the box to compare. That's not suppose to happen. And explains why my battery was being drained. New alternator fixed the whole thing!
Sign In or Register to comment.