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DPF regeneration: your questions answered

Although Toyota’s passenger car range is predominantly focused around petrol-electric hybrid powertrains, the Land Cruiser, Hilux and Proace models are fitted with diesel engines. A diesel particulate filter (DPF) is a feature of these models, and you may have heard about the need for regular DPF regeneration. What does this component do and how do…

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Although Toyota’s passenger car range is predominantly focused around petrol-electric hybrid powertrains, the Land Cruiser, Hilux and Proace models are fitted with diesel engines. A diesel particulate filter (DPF) is a feature of these models, and you may have heard about the need for regular DPF regeneration. What does this component do and how do you take care of it?

What does a diesel particulate filter (DPF) do?

The DPF is fitted within the exhaust system and is designed to catch soot particles and nitrous oxide (NOx) from the combustion process that would otherwise be released into the atmosphere. The DPF is highly effective and traps around 80% of these harmful particulates.

Why do modern diesel engines need a DPF?

European legislation places strict exhaust emissions targets on all vehicle manufacturers. From September 2009, the Euro 5 legislative standard came into effect, part of which required all diesel cars registered from that point on to be equipped with a diesel particulate filter, or DPF.

These filters are used throughout the industry in all diesel-powered passenger vehicles, and their efficiency is vital now that stringent Euro 6d emissions standards are in force.

Do I need to replace a DPF during normal servicing?

Diesel particulate filters do have a capacity limit and can become full. But unlike traditional air, oil or pollen filters that need to be exchanged manually at regular intervals, the DPF has a much longer service life and is designed to regenerate to restore its performance.

The car’s electronic control unit (ECU) is programmed to do this automatically, neutralising the soot by burning it off at high temperature within the exhaust system while the vehicle is running. All modern cars with diesel engines follow this procedure.

How does DPF regeneration occur?

The regeneration occurs automatically, usually without the driver being aware that it is taking place. In the majority of cases, the process is carried out when the engine and exhaust system has reached normal operating temperature and the vehicle is travelling at over 40mph.

However, if your driving is limited to urban areas, the low speeds and frequent stops mean the conditions for normal regeneration do not exist. In these instances, the ECU monitors the accumulation of soot and instructs an alternative regeneration programme to begin well before the filter becomes saturated.

This programme injects small quantities of fuel into the engine after combustion, which increases the temperature within the exhaust system and creates an environment where it is possible to safely burn off the soot.

This method is very successful within the small percentage of vehicles where normal regeneration is not possible. However, due to the nature of city traffic, the regeneration process can be interrupted when the vehicle completes its short journey and is turned off. If this occurs, the ECU is programmed to recommence the process when the engine is restarted and back up to temperature again.

How can I help prevent DPF blockages in my Toyota?

Follow these four simple actions:

1. Regularly drive your Toyota on highways at speeds of between 40-55mph for around 20-30 minutes.

2. Avoid spending unnecessary amounts of time with the engine idling.

3, Try to limit the frequency of short journeys where the engine is running for less than ten minutes.

4. Do not ignore dashboard alerts related to the DPF.

Will I be warned if all DPF regeneration processes have been unsuccessful?

Very occasionally, use of the vehicle might be such that it will have been impossible for the ECU to complete the administration of any regeneration procedure. At this point, the DPF will have become overloaded and stopped functioning, so your Toyota will illuminate a warning light in the dashboard. It will then be necessary for the soot to be neutralised and the filter regenerated manually at a main dealer.

It is extremely unwise to ignore this visual warning as the DPF can become irreparably damaged. What’s more, it is illegal to remove the filter entirely.

Learn more: What is the exhaust gas recirculation valve and what does it do?

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Toyota Motor Corporation works to develop and manufacture innovative, safe and high-quality products and services that create happiness by providing mobility for all. We believe that true achievement comes from supporting our customers, partners, employees, and the communities in which we operate. Since our founding over 80 years ago in 1937, we have applied our…

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Toyota Motor Corporation works to develop and manufacture innovative, safe and high-quality products and services that create happiness by providing mobility for all. We believe that true achievement comes from supporting our customers, partners, employees, and the communities in which we operate. Since our founding over 80 years ago in 1937, we have applied our Guiding Principles in pursuit of a safer, greener and more inclusive society. Today, as we transform into a mobility company developing connected, automated, shared and electrified technologies, we also remain true to our Guiding Principles and many of the United Nations’ Sustainable Development Goals to help realize an ever-better world, where everyone is free to move.

SDGs Initiatives https://global.toyota/en/sustainability/sdgs/

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Orchard business blossoms with Hilux help

It’s late Sunday afternoon on one of the warmest spring days of the year. The ground looks dry and is already beginning to crack. Songbirds and bees compete for attention as the low sun gently warms thousands of blossoming apple trees on a south-facing hillside in the heart of Kent.But with unseasonably low temperatures in…

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It’s late Sunday afternoon on one of the warmest spring days of the year. The ground looks dry and is already beginning to crack. Songbirds and bees compete for attention as the low sun gently warms thousands of blossoming apple trees on a south-facing hillside in the heart of Kent.

But with unseasonably low temperatures in the overnight weather forecast, the race is on to protect a 75-acre orchard from frost damage. One way to do this is to make sure the grass between each row of trees is kept short. This helps to increase airflow and reduces the chance of cold air settling. 

Claire Seymour, 43, gently edges her Toyota Hilux between a row of trees at Tubslake Farm, near Hawkhurst in Kent. Her pick-up’s white paintwork and red signwriting match the flowering pink and white Braeburn apple blossom. Her husband, Steve Bowles, also 43, then sets about unloading a large green Fendt 209V tractor from an enormous six-wheeled flat-bed trailer behind the Toyota. He starts up the brand new tractor and then begins to set up and test the Fisher variable-width mower before handing it over to its new owner for an evening of urgent grass cutting.

Claire is managing director of NP Seymour Ltd, an engineering and agricultural machinery dealer set up by her family in 1974. Based in nearby Cranbrook, the company supplies and makes equipment for orchards, vineyards and fruit growers across the UK. 

“We’ve had other pick-ups in the past but I was impressed with the comfort of the Hilux. We bought it from Beadles Toyota, Medway, in the spring of 2019.

“It’s the Invincible model and is fitted with off-road tyres and a Truckman top on the back. We use it all the time for customer deliveries all over the UK, visiting growers and going to shows. The 3.5-tonne towing capacity is really important to us as lots of our kit is very heavy,” explained Claire.

Surrounded by apple blossom, NP Seymour’s Toyota Hilux delivers a tractor to an orchard at Tubslake Farm, Hawkhurst, Kent.

“We’ve been really busy since we’ve owned it. Covid didn’t really slow us down at all. We just had a few difficulties with staff numbers. But the demand for our machinery hasn’t stopped.

“The Hilux has already done 50,000 miles, and absolutely nothing has gone wrong with it. We’ll definitely buy another Toyota when it’s time to replace this one,” she said, just before hurrying off, leaving the orchard in a cloud of dust to go and enjoy the rest of her Sunday evening with Steve.

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Toyota Motor Corporation works to develop and manufacture innovative, safe and high-quality products and services that create happiness by providing mobility for all. We believe that true achievement comes from supporting our customers, partners, employees, and the communities in which we operate. Since our founding over 80 years ago in 1937, we have applied our…

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Toyota Motor Corporation works to develop and manufacture innovative, safe and high-quality products and services that create happiness by providing mobility for all. We believe that true achievement comes from supporting our customers, partners, employees, and the communities in which we operate. Since our founding over 80 years ago in 1937, we have applied our Guiding Principles in pursuit of a safer, greener and more inclusive society. Today, as we transform into a mobility company developing connected, automated, shared and electrified technologies, we also remain true to our Guiding Principles and many of the United Nations’ Sustainable Development Goals to help realize an ever-better world, where everyone is free to move.

SDGs Initiatives https://global.toyota/en/sustainability/sdgs/

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