# Case Study – Toyota Hilux – GUN126 – 1GDFTV – THE DPF SYSTEM FAILURES
05/06/2024 | Author: admin | No comments | Categories: Diagnostics • DPF Repairs • News & Blog
Most people will know that these vehicle suffer from DPF issues, i have heard every thing from the 5th injector to the way the vehicle is driven. so anyways finally had the chance to look at a vehicle that has 100,000kms on the clock and it is doing what every one else has been taking it back to toyota for.
So being us here we took a look drove the vehicvle around and checked the live data, the vehicle does go into a regen and it finishes, cool system operational.,
the differential pressure builds back up too quickly for my liking, – Leaky Diesel Injectors, as we know they are worn a 100,000kms. but i wasnt happy just with that so i decided to puit a camera down in the temp probe holes and see whats happening,
heres what i saw:
- the entry into the cat was blocked all around the outer diameter the holes being blocked.
- the temp probe #2 dirty and the DPF differential pipe was blocked – dusty carbon had blocked the hole
- the temp probe #3 was clean
- going back to the #1 temp probe i turned the camera to see what else was there and i noticed, that the way the outlet from the turbo comes out in the turbine wheels diameter and then all of a sudden the pipe opens to DPF / Catalyst Diameter ( FAIL )
- Throughout the Relevant Period, was it the case that:
- 4 –
- 5 –
- Were all Relevant Vehicles subject to the statutory guarantee as to acceptable quality
- Can the question of whether the Relevant Vehicles were not of acceptable quality
- Were the Relevant Vehicles not of acceptable quality within the meaning of s 54(2) of
- Was the 2020 Field Fix effective in, and will it continue to be effective in, remedying
- During the Relevant Period, did TMCA represent to the public at large that the
- 6 –
- Was each Vehicle Representation made continuously by TMCA throughout the
- Lack of proper maintenance: If the DPF is not regularly cleaned and maintained, it can become clogged with soot and other particles, reducing its effectiveness and eventually leading to failure.
- Short driving trips: DPFs require regular high-temperature regeneration to burn off the trapped soot. If a vehicle is used primarily for short trips where the exhaust does not reach high enough temperatures, the DPF may not be able to regenerate properly, leading to failure.
- Faulty sensors: The DPF system has sensors that monitor the temperature and pressure within the filter. If these sensors are faulty or malfunctioning, they may not trigger the necessary regeneration process, leading to DPF failure.
- Low-quality fuel: Using low-quality or contaminated fuel can result in increased soot production and buildup in the DPF, causing it to become clogged and leading to failure.
- Mechanical issues: Other mechanical problems with the vehicle, such as a leaking exhaust system or a faulty EGR valve, can impact the effectiveness of the DPF system and cause it to fail.
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