Here’s a description of the throttle body in the Perodua Axia 1.0 / 1KR-VVT engine (engine code 1KR-VE), including its role, construction, and related details. If you want more on diagnostics, servicing, or failure symptoms I can add that too.

Engine Context / 1KR-VE

• The Axia 1.0 VVT-i is powered by the 1KR-VE engine — a 998 cc, 3-cylinder, DOHC, 12-valve petrol engine with VVT-i on the intake side.  
• Max output is about 50 kW (≈ 67 hp) at ~6,000 rpm; torque ~91 Nm at ~4,400 rpm.  
• It uses EFI (Electronic Fuel Injection) and has a relatively high compression ratio and improved intake manifold design compared to older non-VVT versions.  

What the Throttle Body Is & Its Purpose

• The throttle body is a component in the air intake system, sitting between the air filter (or air intake hose) and the intake manifold.
• Its main part is a butterfly valve (throttle plate) which opens/closes to regulate how much air enters the engine. More air = more combustion = more power, when paired with fuel injection.
• It often includes sensors like Throttle Position Sensor (TPS) that tell the engine control unit (ECU) how far the throttle is open. Also idle control mechanisms (could be via idle air control valve or via controlled bypass) help maintain idle speed when throttle is closed or nearly closed.

Specifics in the Axia / 1KR-VE Setup

While I couldn’t find a fully detailed OEM spec sheet just for the throttle body alone (such as exact diameter, motor type, etc.), here are what we know or can infer:

• It’s an electronically controlled throttle (drive by cable or electronic motor?) — in modern EFI + VVT-i engines, the throttle is usually driven by a motor/sensor assembly managed by the ECU. (In many Toyota/KR engines, TPS + electronic drive are used.)
• It must accommodate the upgraded parts of 1KR-VE: the higher tumble intake port, longer intake manifold etc. which influence how the throttle body connects and flows.  
• The throttle body must work in tandem with VVT-i: when intake cam timing changes, airflow demands at various rpms change, so the throttle body must support smooth airflow control.

Key Functions

• Regulate airflow into the engine depending on driver demand (pedal input), engine load, ambient conditions, etc.
• Maintain idle speed when throttle plate is closed, to keep the engine stable at rest.
• Feedback to ECU via sensors (position, maybe motor current) so ECU can balance air + fuel for correct combustion.
• Response / performance: clean, properly functioning throttle body improves throttle response, accelerations & prevents lag.

Common Problems & Considerations

• Dirt/carbon buildup on the throttle plate or inside the throttle body can lead to unstable idle, stalling, poor throttle response.
• Sensor issues (like TPS) can mislead ECU, causing wrong airflow / fuel mixture.
• If the throttle body motor is weak or malfunctioning, there might be delayed or erratic throttle behavior.

If you want, I can try to find the exact spec (diameter of the butterfly valve, part number, etc) for your Axia’s throttle body to help with parts or servicing. Do you want me to pull that up?