The Toyota AZ engine family is a

straight-4 A straight-four engine (also referred to as an inline-four engine) is a four-cylinder piston engine where cylinders are arranged in a line along a common crankshaft. The majority of automotive four-cylinder engines use a straight-four layout ( ...

piston engine A reciprocating engine, more often known as a piston engine, is a heat engine that uses one or more Reciprocating motion, reciprocating pistons to convert high temperature and high pressure into a Circular motion, rotating motion. This article ...

series. The AZ series uses an aluminium engine block with cast iron cylinder liners and aluminium

DOHC An overhead camshaft (OHC) engine is a piston engine in which the camshaft is located in the cylinder head above the combustion chamber. This contrasts with earlier overhead valve engines (OHV), where the camshaft is located below the combus ...

cylinder head. The engine series features many advanced technologies including slant- squish

combustion chamber A combustion chamber is part of an internal combustion engine in which the air–fuel ratio, fuel/air mix is burned. For steam engines, the term has also been used for an extension of the Firebox (steam engine), firebox which is used to allow a mo ...

s, offset cylinder and crank centers, and the VVT-i continuously variable intake valve timing system. The aluminium engine measures long, wide, and tall. The cylinder block is an open-deck, midi-skirt die-cast aluminium type with cast-in iron liners and a die-cast aluminium lower crankcase and a stamped oil pan. The forged steel

crankshaft A crankshaft is a mechanical component used in a reciprocating engine, piston engine to convert the reciprocating motion into rotational motion. The crankshaft is a rotating Shaft (mechanical engineering), shaft containing one or more crankpins, ...

is fully balanced with eight counterweights and supported by five main bearings. A helical gear pressed in No. 3 counterweight drives twin contra-rotating balance shafts in the shaft housing within the lower crankcase. The dual overhead camshafts are driven by a single-stage roller chain of pitch, enabling a narrow included valve angle of 27.5°. The camshafts act on four valves per cylinder via bucket tappets. As in the recent

Toyota is a Japanese Multinational corporation, multinational Automotive industry, automotive manufacturer headquartered in Toyota City, Aichi, Japan. It was founded by Kiichiro Toyoda and incorporated on August 28, 1937. Toyota is the List of manuf ...

engine practice, no clearance adjusting shim is employed. Valve diameters are for intake and for exhaust, with lift for both intake and exhaust. The four-vane VVT-i device is fitted on the intake camshaft, altering timing by 50°. The valve cover is made of magnesium to save weight. Fuel is injected sequentially via an ultra-fine-atomization injector with twelve small injection holes, each in diameter. As in the smaller NZ engine, the new AZ adopts a plastic, built-up, and vibration-welded

intake manifold An inlet manifold or intake manifold (in American English) is the part of an internal combustion engine that supplies the fuel/air mixture to the cylinder (engine), cylinders. The word ''manifold (engineering), manifold'' comes from the Old Eng ...

integrating a large volume plenum chamber ( volume including a resonator). Exhaust manifolds are of tubular construction with integrated catalytic converters. The AZ is the replacement for the S engine. Its successor is the AR engine.

Excessive oil consumption

The 2AZ-FE engine in the 2007-2009 Camry and 2006-2009 Rav4 may burn excessive oil and is involved in this lawsuit. Other engines are also affected. If this Toyota engine is burning more than of oil in , has less than , is less than 10 years old, and is located in the U.S., Toyota service will perform a free oil consumption test to determine if the engine is affected. There are approximately 1,715,200 vehicles covered by this Warranty Enhancement Program. A similar campaign are also done in Japan by Toyota in 2014.

1AZ

The ''1AZ'' line of engines have of displacement.

1AZ-FE

The 1AZ-FE is a version. Output is at 6000 rpm with of torque at 4000 rpm for the Camry Aurion version. Rav4 and Ipsum engines were rated at at 6000 rpm and of torque at 4000 rpm. The 1AZ has a total displacement of with bore and stroke, and a compression ratio of 9.6:1. * 2002-2006

Toyota Camry The Toyota Camry (; Japanese: トヨタ・カムリ ''Toyota Kamuri'') is an automobile sold internationally by the Japanese auto manufacturer Toyota since 1982, spanning multiple generations. Originally compact in size (narrow-body), the Cam ...

(

Southeast Asia Southeast Asia is the geographical United Nations geoscheme for Asia#South-eastern Asia, southeastern region of Asia, consisting of the regions that are situated south of China, east of the Indian subcontinent, and northwest of the Mainland Au ...

Taiwan Taiwan, officially the Republic of China (ROC), is a country in East Asia. The main geography of Taiwan, island of Taiwan, also known as ''Formosa'', lies between the East China Sea, East and South China Seas in the northwestern Pacific Ocea ...

ese version) * 2006–2009

( Aurion version) * 2000–2003

Toyota RAV4 The is a compact crossover SUV produced by the Japanese automobile manufacturer Toyota. It is known for starting the wave of compact crossovers. The RAV4 is one of the best-selling SUVs of all time. By February 2020, a total of 10 million RAV4 ...

* 2003-2006 Toyota RAV4 Euro * 2001–2009

Toyota Ipsum The Toyota Ipsum, Picnic, or Avensis Verso is a car produced by the Japanese carmaker Toyota from 1995 to 2010. It is a compact MPV with standard three-row seating. The Ipsum, like many Toyota products, was shared as a trio of the Toyota Gaia, and ...

* 2004–2008 Toyota Wish (Southeast Asian/Taiwanese version)

1AZ-FSE

The 1AZ-FSE is a version. Bore and stroke is , and a compression ratio of 11.0:1. Output is at 5700 rpm with of torque at 4000 rpm. The 1AZ-FSE features Toyota's D-4 direct injection system. * 2000-2003 Toyota Avensis T220 (facelift) * 2003-2008 Toyota Avensis T250 * Toyota Avensis Verso * Toyota Noah/Voxy *

Toyota Gaia The Toyota Gaia is a Japanese-market MPV that competed with the Nissan Prairie, Mitsubishi Chariot and the Honda Odyssey. It was later replaced by the Toyota Isis. The Gaia shares a platform with the Toyota Ipsum (sister model) and Toyota Cald ...

Toyota Isis The Toyota Isis is a seven-seat large MPV manufactured by Kanto Auto Works under contract for Japanese automaker Toyota. It is sold in Japan and was launched in September 2004. It features sliding doors and is available with either front- or f ...

* Toyota Caldina * Toyota Wish * Toyota Nadia *

Toyota Allion The and its twin the are sedans sold in Japan from 2001 to 2021 by Toyota. The sedans are designated as a compact car by Japanese dimension regulations and the exterior dimensions do not change with periodic updates. Unlike Toyota's other ve ...

* Toyota Premio * Toyota Opa

2AZ

The ''2AZ'' line of engines have of displacement.

2AZ-FE

The 2AZ-FE is a version built in Japan (Kamigo Plant and by Toyota Industries Corporation), at TMMK in the USA and also built in China for select Scion xB models, and also in Australia, obtains a total displacement of with bore and stroke, with a compression ratio of 9.6:1. Output is at 5600 rpm; of torque at 4000 rpm. Later versions of the 2AZ-FE engine were upgraded with 9.8:1 compression ratio, a slightly more aggressive intake cam profile, 6500 rpm redline, and piston oil squirters. These later versions are rated at in the Scion tC, in the RAV4, and in the Camry, Corolla XRS, Scion xB, and for the Previa/Estima/ Alphard. Some Japan-made Toyota vehicles with the 2AZ-FE engine were equipped with the K112 transmission also referred to as 7-speed Super CVT-i automatic (Seven-speed Sequential Shiftmatic) from October 2005. However, these later 2AZ-FE models were the first to be rated under the new SAE J1349 standard. The new standard usually produces more conservative numbers, though no definitive comparison is available since the two versions were never tested by the same standard. The RAV4 uses a different timing chain cover from the Camry, they can however be interchanged. A TRD supercharger was available for the Scion tC and 2nd generation xB until Spring 2009. There have been complaints of this engine "burning oil" in North America, with the issue starting after , though mostly after . Piston ring design has been identified as a potential problem. Toyota has issued a TSB (Technical service bulletin) TSB #0094-11 in August 2011 but has not issued a recall. Alternative theories point to a head gasket problem: the 2AZ-FE aluminum block threads may wear out on the back three middle bolts (closest to firewall). Check TSB SB-0015-11. There are several class-action lawsuits underway regarding this issue. In January 2015, Toyota North America issued extended warranty notification (ZE7) for this issue for Toyota North America vehicles only. * 2002–2011

in Australia. ACV40R * 2009–2011 Toyota Matrix S (USA)/XR (Canada)/XRS * 2009–2010 Pontiac Vibe * 2009–2010

Toyota Corolla The is a series of compact cars (formerly Subcompact car, subcompact) manufactured and marketed globally by the Japanese automaker Toyota Motor Corporation. Introduced in 1966, the Corolla was the best-selling car worldwide by 1974 and has bee ...

XRS (2011-2013 only in Mexico and in Canada) * 2002–2008 Toyota Camry Solara * 2004–2012

* 2000–2007 Toyota Highlander/Kluger * 2000−2013 Toyota Harrier * 2000-2019 Toyota Estima / Toyota Previa / Toyota Tarago * 2001-2010

* 2002−2015

Toyota Alphard The is a minivan produced by the Japanese automaker Toyota since 2002. It is available as a seven or eight-seater with petrol and hybrid engine options. Hybrid variants have been available since 2003, which incorporates Toyota's Hybrid Syne ...

* 2008−2015 Toyota Vellfire * 2006−2012 Toyota Blade * 2003-2009 Toyota Avensis * 2005–2010 Scion tC * 2008–2015

Scion xB The Scion xB is a five-door compact hatchback that was produced by Scion (automobile), Scion, a former marque of Toyota. Produced from the 2004 to 2015 model years, it was one of the two launch models of the Scion marque, alongside the Scion xA. ...

* 2007-2013 Toyota Mark X ZiO

2AZ-FSE

The 2AZ-FSE is a version. Bore and stroke is , and a compression ratio of 11.0:1. Output is at 5800 rpm with of torque at 3800 rpm. The 2AZ-FSE features Toyota's D-4 direct injection system. * Toyota Avensis

2AZ-FXE

The 2AZ-FXE is an

Atkinson cycle The Atkinson-cycle engine is a type of internal combustion engine invented by James Atkinson (inventor), James Atkinson in 1882. The Atkinson cycle is designed to provide Energy conversion efficiency, efficiency at the expense of power density. ...

variant of the 2AZ-FE. It has the same bore and stroke, but the intake cam and pistons are unique. It has a physical

compression ratio The compression ratio is the ratio between the maximum and minimum volume during the compression stage of the power cycle in a piston or Wankel engine. A fundamental specification for such engines, it can be measured in two different ways. Th ...

of 12.5:1. The longer than normal open intake valve duration leads to a reduction in cylinder charge and reduced torque and power output, but efficiency is increased. This combination makes the 2AZ-FXE suitable for use only in

hybrid vehicle A hybrid vehicle is one that uses two or more distinct types of power, such as submarines that use diesel when surfaced and batteries when submerged. Other means to store energy include pressurized fluid in hydraulic hybrids. Hybrid powertrai ...

s, where peak torque and power demands can be met by the

electric motor An electric motor is a machine that converts electrical energy into mechanical energy. Most electric motors operate through the interaction between the motor's magnetic field and electric current in a electromagnetic coil, wire winding to gene ...

and battery. Maximum output when used in the Camry hybrid is at 6000 rpm with of torque at 4400 rpm. * 2003–2014

Hybrid * Toyota Estima Hybrid * 2007–2011 Toyota Camry Hybrid AHV40 * 2010–2014 Lexus HS 250h * 2009–2017 Toyota Sai

3AZ

The 3''AZ'' line of engines have of displacement.

3AZ-FXE

The 3AZ-FXE is an

engine which is always paired to an electric motor in a hybrid system. This engine is an analogue of the 2AZ-FXE which is for the Chinese market only. * 2010 Toyota Camry Hybrid AHV40 (China)

References

{{Reflist AZ Straight-four engines Gasoline engines by model