Description
Engineered by INA (a premier flagship brand of the Schaeffler Group), the INA Electronic Throttle Body Assembly provides a complete, factory-calibrated Drive-by-Wire (DbW) intake air management solution for modern electronic fuel injection (EFI) engines. Designed as a drop-in, plug-and-play complete assembly, it integrates a precision CNC-machined die-cast aluminum housing, an integrated high-torque DC electric actuator, a low-backlash reduction gear train, a dual-channel non-contact position sensor, and a factory-balanced throttle plate. Communicating in real time with the Powertrain Control Module (PCM), it regulates air intake volume within milliseconds to deliver seamless throttle response, precise idle speed regulation, and optimized combustion efficiency. Built to withstand continuous engine vibration, intake pressure surges, and corrosive crankcase PCV blow-by gases, this complete assembly eliminates common electronic throttle failures such as throttle sticking, hesitations, and limp-home fault codes. It represents an ideal, highly reliable replacement component for automotive distributors, specialized repair facilities, and global engine rebuilders.
Technical Parameters
| Category | Specifications & Technical Details |
| Factory-Calibrated Plug & Play Assembly Integration | Delivered as a complete assembly. The throttle body, drive motor, gear reduction mechanism, and sensors are all factory-calibrated for airflow and signal accuracy. No disassembly or separate purchase of internal components is required. Simply connect directly to the OEM wiring harness and intake pipe, greatly reducing labor time and eliminating seal failure caused by secondary assembly. |
| Dual-Channel Non-Contact Hall Effect Position Sensor | Built-in dual-channel Hall effect opening sensors that completely eliminate physical wear. By detecting magnetic field changes at the shaft end, they output linear voltage to the ECU in real time, with opening detection accuracy maintained within ±0.5%. Effectively prevents signal loss, idle shaking, and P0121 / P0221 fault code triggers caused by traditional potentiometer wiper wear. |
| High-Torque DC Servo Actuator & Low-Backlash Gearbox | The assembly incorporates a high-power high-magnetic DC servo motor, paired with a low-backlash reduction gearbox. Throttle plate switching time from 0° fully closed to 90° fully open is controlled at less than 50 ms, ensuring zero power lag the instant the pedal is pressed and meeting the demand for rapid intake airflow switching. |
| Fail-Safe Dual Return Spring Mechanism | Integrates two sets of independent mechanical pre-loaded return springs. When encountering vehicle power supply interruption, control harness connector detachment, or ECU-triggered safety protection mode, the springs force the throttle plate back to the fixed 5° to 7° “Limp-Home Mode” safety opening within milliseconds, preventing the plate from sticking in the fully open position and causing unintended vehicle surging. |
| CNC-Machined Precision Bore & Low Idle Leakage Sealing | The die-cast aluminum body’s internal intake bore and throttle plate edges are CNC ground to micron-level fit tolerances. Under idle closed conditions, parasitic bypass air leakage is strictly limited to below 1.5 kg/h, preventing unmetered air from entering the combustion chamber and ensuring extremely stable engine start-up and idle operation. |
Applicable Car Brands & Models
Replacing the entire assembly ensures all internal components—including the housing bore, throttle plate, return springs, DC actuator, and position sensors—are factory-matched and structurally sealed. Individual component replacement often fails because wear on internal gear teeth or housing corrosion will quickly ruin a newly installed sensor, leading to repeated labor costs.
Primary failure symptoms include:
Check Engine Light or EPC/Limp Mode Light: Dashboard warning indicators illuminated with diagnostic trouble codes (e.g., P0121, P0221, P2135).
Unstable Idle & Engine Stalling: Engine RPM surges up and down at idle or stalls completely when coming to a stop.
Hesitation & Dead Pedal Feel: Delayed acceleration response or sudden loss of engine power under load.
Rough Misfires: Uneven air intake causing poor air-fuel ratios and cylinder misfires.
Yes, an ECU Throttle Relearn / Adaptation procedure is mandatory after installation. Using a diagnostic scan tool, the engine computer must clear learned offset values from the old worn assembly and register the exact mechanical stops (0%closed and100%open) of the new INA assembly.
Each INA Electronic Throttle Body Assembly is individually packaged in a Schaeffler INA branded protective carton, sealed in a moisture-proof anti-static bag with plastic protective caps shielding the electrical pins and mounting flange. Minimum Order Quantities (MOQ) for wholesale buyers generally start at 5 to 10 units per part number, with consolidated pallet shipping options available.
