There is also Toyota's DIS ignition system (Direct Ignition System) which used individual ignition coils for each cylinder. The air mass and flow rate are measured by slot-in type air flow meter which also has a built-in intake air temperature sensor. The 3UR-FE uses a sequential fuel injection (SFI) only, there is no direct injection. The 3UR-FE has linkless-type throttle body with electronically controlled throttle angle by ETCS-I (Electronic Throttle Control System - intelligent). This system allows changing a length of the intake ports according to the engine speeds. The intake manifold of the 3UR-FE is made from plastic and equipped with Toyota's Acoustic Control Induction System (ACIS). The engine can control the intake and exhaust camshaft angles by the Dual Variable Valve Timing - intelligent system (Dual VVT-i). All chains have a chain tensioner that used oil pressure and a spring. Each intake camshaft drives the exhaust camshaft by the secondary timing chain. The engine uses two primary timing chains for the intake camshafts. The valves are actuated by roller rocker arms. They are aluminum alloy cylinder heads with camshaft housings, four valves per cylinder (two exhaust valves and two intake valves), and double overhead camshafts. Four oil jets in the block cools pistons by oil. The 3UR has its own forged steel crankshaft with six balance weights, forged connecting rods, and aluminum alloy pistons with a resin coating. There is a 102.0 mm stroke for increasing displacement to 5.7l. Bore pitch is 105.5 mm 21.0 mm cylinder banks offset. Like other members of its family, which also included the 1UR-FE/FSE, 2UR-GSE/FSE, the 3UR-FE has an aluminum cylinder block with 90-degree 'V' angle.
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