Hilux 4x4 Forum

Hey guys and girls....so I have a small problem on my 2.5 D4D 4x4 and it all started in December...

I was travelling between Mariental and Windhoek and all of a sudden my enging check light comes on and my beastie goes into limp mode. So naturally I pull off next to the road switch off and open the bonnet equipped with my fixer all 4 pound tool to see if I can fix the problem...checked all hoses from aircleaner to the intercooler and manifold all seems good. Checked for any oil in or around turbo housing and found nothing....checked oil level and water levels and also all good....so with nothing apparent I got back in and started again....check enginge light is off and so off I go again...no power loss no smoking, she is running great again. 

Then 20km before Windhoek same story and not being to far from home I carried on in limp mode.
Parked at home and next day called the agent to do a diagnostic on the bakkie.

So I was told it is turbo problem and that it needs to be replaced...failing to believe the prognosis I contacted the second dealer and did another diagnostic...this time they indicated that the MAP sensor only is faulty and they can fit a new one...this done and all errors reset of I go on vacation.

Low and behold coming back from Capetown last week the same thing happens again. 

Back to dealer number 2 to diagnose and again MAP sensor faulty and as there are no warranties on electrical components I must by new one again...not being happy I did not...

So now I have check function of orginal sensor and new sensor with multimeter and probes connected indicating supply voltage of 5.03V and signal output of 0.895V at idle. When hitting the accelerator the signal voltage does change indicating working sensor output but still engine check light is on.

I then asked a friend with same bakkie if I can test his sensor as to the votage output on his signal which was 0.903 at idle and changed when revving the motor...

Plugged my unit in and all is well on his vehicle and he has done 1500km hard driving already with my sensor installed...being to scared of damaging his original I don't want to fit it to my vehicle.

But now I am stuck and I have no idea where or what to do or try next....

If anyone can offer a solution or a direction I can follow it will be greatly appreciated....

Firstly, Welcome to the Forum.
Secondly, I am not even an Appy mechanic, but,
I have read posts where these vehicles go into limp mode, because,
The Catalytic Converters get clogged up.
This should not be the case with you driving long distances from Mariental to Windhoek
and to Cape Town and back which normally generates enough heat to melt that gunge and push it out the back of the exhaust.
Not knowing your driving style makes it hard to guess at what the solution could be.
That said, there are people a lot more clever than I am on this forum, who should be able to give you a starting point...

Thank you for the reply Haboob....yes I do long distances with the vehicle and I very particular about my fuel I use as well.

Welcome Tiaan!

Not sure I can help much either .... diesels aren't my thing. The sensor you're talking about, is that the MAF (mass air flow)?
Doubt that is the cause if the old one works fine in your friend's vehicle .... also since you had the same problem after some time with the new replacement unit. Must be some other underlying issue or a sensor giving faulty info to the ECU.

Turbo's can give problems that aren't always apparent, so it might be a good idea to have it checked. Then there are things like the blocked cat that Edge mentioned, dirty particulate filters, injectors that have moved out of calibration spec, AFR sensor could be dirty and same with the EGT sensor if you have one fitted.

Hopefully someone with a more thorough knowledge of diesel problems will assist.

Thanks Mud Dog....yes it seems I will have to go through everything...problem stil remains that diagnostic machine points only to the MAP (Manifold Absolute Pressure) sensor fitted to the side of the intercooler....I hate all the electronics on the modern day vehicles.....old school more my style so if you know anyone with and 84 to 86 2.4 SFA Diesel Hilux 4X4...let me know....

Agree!

Tiaan ek stem saam met Mud Dog, gaan die sensors na. Ek het op my Isuzu so 'n probleem gehad en die rekenaar het nie die regte probleem uitgewys nie. Het toe die MAF sensor uitgehaal en skoongemaak. Kry so 'n buis spuitstof wat die rekenaar mense gebruik om die elektronika van die rekenaars mee te spuit/skoonmaak. Dit spuit skoon en verdamp onmiddelik. Spuit die sensor skoon en toets. Dit kan 'n lang proses wees.
Sterkte.

Hi Tiaan. I have a problem with my map reading as well and I have done a lot of testing and research on it. Unfortunately mine is the ecu. If u have access to a diagnostic tool. First check would be the map reading on the diagnostic tool with the ignition on and the engine off. It should be in the same region as the atmospheric pressure.

Hope that helps

Kyk mooi na die plug en drade - erens kan 'n draadjie net-net deurgeskuur wees.

Maak ook seker die earth na die enjin is mooi skoom en styf vas, mens weet nooit.