jackeroo-check engine light

Your computer is going into limp mode, most likely overheating coolant,radiator problem.Try this web site www.forum.australia4wd.com.
Jackaroo section and someone there will know the answer.

Darryl

Potbelly, I too had this identical problem. Assuming that you have not been using an oiled foam type air filter you may try cleaning your radiator & AC condenser core. I found in mine, after several heated & accrimonious discussions with my local Holden dealer who could not fix the problem under warranty because they said they had tried everything, that there was some paper that had been left in the water galleries at manufacture that had been made into papier mache and had collected around the Thermostat preventing coolant flow especially when towing uphill. After I had a mate who is a Barrister contact Holden & show them the evidence the dealer referred the problem to Holden HQ who said basically "Get lost" but after a summons to appear in court was issued they backed down & offered a generous compensation package which I eagerly accepted. Part of the deal was that I would not discuss this with anyone, well sorry Mr Holden that directive is in breach of the "Fair Trading Act"!
The use of oiled foam type air filters will cause many sensors to fail as the minute dropplets of oil from the filter will "contaminate" them.
Do you have a manual? I have one that I downloaded before Isuzu closed the site down... Pleased to mail you one on CD, handy to have with your laptop when travelling as many out of the way places don't have manuals and can't do repairs as a consequence.
The Jackeroo is a nice vehicle it is well engineered but it is complex & expensive to maintain and Holden don't seem to be interested unless there is big money paid buy the consumer

Just an aside to "Basil" above - I have in fact come across a 99 TD Jack owner on the wallaby who had only ever used genuine paper air filters and his Check E light was on - had it tested - sensor in the throttle body was NBG. Food for thought ! He left it and motored on, as I have done.
Re Potsy.........
I have the same chariot - my light has been on for years now - had it checked at a dealer - their machine said it was a gas sensor in the throttle body (NOT the actual throttle body at fault - just the sensor) - I have not replaced it (others here, a year or two back, discovered that the sensor can be repaced for about $200 plus labour - the whole throttle body does not have to be replaced) - my light stays on - the car is fine - will worry about that when I need to quit the car. Drama is we have sophisticated cars that virtually nobody can analyse faults in - any fool can keep replacing components until they right themselves. There have been posts here on this scenario in recent times - we don't pay for "trying" - we pay for results - if they don't fix it after replacing expensive gear, why don't we insist that they put the old gear back on, and start again ? I have seen this done with household goods - maybe cars should follow. Dealers , of course, will try to say that the seemingly good part was dodgy - hard to prove either way. There was a post here about a week or so back on the very thing. Its a bugger.
Quite worrying for the future of funding car repair.

I have just got one of these and put it in my Jack. http://www.scanguage.com/

Bloody brilliant - I don't have any problem at the moment, but this thingy will report what the error code(s) are instantly. This will give you the same info that a Tech II will give.

Should help you to go to a dealer and say I have error code xxxxx, so it's not the bloody oil sensor switch so don't fleece me.

I have a 2000 model Jackaroo 3.0 TD with the same overheating problem.
I have been through all the normal checks and replacements and am looking to replace the radiator for something a little more heavy duty. Apparently this was identified as a problem over in the UK and double core radiators were fitted. I haven't been able to source a reasonably priced double core aluminium radiator yet but the best price so far is around $700 from Aussie desert Coolers in Melbourne who need my radiator for up to a couple of weeks to build a 57mm cored one to replace it. I can't spare the vehicle for that long at the moment. Natrad don't have a core replacement other than in copper/brass which I am told will only be about as good as whats in it now.
I have had nothing but trouble with my Jack since day 3 and my check engine lights coming on now intermittently as well just recently. Another one to add to the long list.

It an auto what is the possability of transmission fluid need changing if it has done a bit of towing. ???
Cheers
Charlie