Hilux D4D limp mode - NO engine light

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jdreyer77
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Hilux D4D limp mode - NO engine light

Post by jdreyer77 »

Hi there,

I had my fair share in the past with the limp mode problems but this one is baffling. I used to have DieselTorque chip and the bakkie ran 100% fine with this. About a year ago it suddenly started with the limp mode problem and engine light comes on. Removed the chipped (as this is 99% the culprit) and the problem remained, did a remap and the problem remained with various reasons when running diagnostics, Cam sensor, Fuel sensor, EGU etc etc. Took 2 similar bakkies and started swapping sensors between, problem remained. Finally replaced the ECU. The new ECU however was not the same, according to the remapping guys as it did not have all the settings they can usually adjust, their opinion was it looked like a default unit that has not had any Toyota upgrades done.
Long story short, remapped and was running fine however when the bakkie runs over 3200 rpm and taking strain either being a hill or towing (overtaking) it goes into limp mode, but NO engine light and no fault code on the diagnostics. Also previously with limp mode you can switch off and on and the problem is sorted. This limp mode you have to switch off, remove the key, lock the doors, unlock and start, sometimes you have to repeat this twice.

Removed the remapping and doing the same - so the problem is the same before I initially replaced the ECU, but no fault code. It runs 100% on normal day to day drive, only when pushed over 3200 rpm. Again have swopped parts between similar bakkies, sensors (Fuel, Air, CAM, diesel pump etc etc) but problem remains.

Where do you start without a fault code?

I am thinking the ECU, as recently locking the car is a problem. It will work fine, only not to work the next minute. Replace both keys batteries and the problem remains but very intermittent - this however only started recently and not sure if the ECU plays any role here.

Any ideas are welcome!
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Mud Dog
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Re: Hilux D4D limp mode - NO engine light

Post by Mud Dog »

I'm by no means a fundi on this but ja, I think it's now an ECU problem. Once you fit an after market chip it interferes with the original ECU mapping and it's irreversible, even if the chip is removed.

What I don't understand is that there is still a problem after the ECU has been replaced. Sounds like a sensor that you may perhaps not have swopped out is playing up. Hopefully the guys with more knowledge and experience with ECU's and chips can shed more light.
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Jaws
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Re: Hilux D4D limp mode - NO engine light

Post by Jaws »

Could even the turbo VNT system.


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Dippies
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Re: Hilux D4D limp mode - NO engine light

Post by Dippies »

Have a look at your SCV, suction control valve. Have seen a lot of these cause limp mode problems. Having a chip, or remap will aggravate the problem.


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ThysdJ
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Re: Hilux D4D limp mode - NO engine light

Post by ThysdJ »

When you say you removed the chip.. did you remove the entire thing, harness and all or did you just plug the bypass chip in? I had the scenario where I asked the guys who installed it to remove the Race Chip I had in. They did it by plugging in the bypass. I never knew this, and the limp mode was better but was still there from time to time. About 3 months later it became progressively worse, and sometimes 4 times in a 10km stretch. After long searching and injector guys looking and testing I asked them to check and see if the chip's wiring harness was removed because of something I read on another forum. Took that out and all the problems disappeared. It has been 3 years now.. :thumbup: :thumbup:
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