Hyundai i-30: Engine Control System / ETC (Electronic Throttle Control) System

Hyundai i30 (PD) 2018-2024 Service Manual / Engine Control / Fuel System / Engine Control System / ETC (Electronic Throttle Control) System

Description and operation
The Electronic Throttle Control (ETC) System consists of a throttle body with an integrated control motor and throttle position sensor (TPS). Instead of the traditional throttle cable, an Accelerator Position Sensor (APS) is used to receive driver input. The ECM uses the APS signal to calculate the target throttle angle; the position of the throttle is then adjusted via ECM control of the ETC motor. The TPS signal is used to provide feedback regarding throttle position to the ECM. Using ETC, precise control over throttle position is possible; the need for external cruise control modules/cables is eliminated.

[Throttle Position Sensor (TPS)]
▷ Type : IC Rotate Sensor Type
▷ Specification

[ETC Motor]
Coil Resistance (Ω)
1.29 - 1.57 [20°C (68°F)]

Fail-Safe Mode
ETC Motor
Throttle valve stuck at 9.2°
TPS1 fault
ECM looks at TPS2
TPS2 fault
ECM looks at TPS1
TPS 1, 2 fault
Throttle valve stuck at 9.2°

When throttle value is stuck at 9.2°, engine speed is limited at below 1,200 - 1,700 rpm.
Schematic diagrams
Schematic Diagram

Circuit Diagram

Harness Connector

Repair procedures
Throttle Position Sensor (TPS)
Connect the diagnostic tool on the Data Link Connector (DLC).
Start the engine and measure the output voltage of TPS 1 and 2 at C.T. and W.O.T.
Specification : Refer to "Specification"
ETC Motor
Turn the ignition switch OFF.
Disconnect the ETC module connector.
Measure resistance between the ETC module terminals 1 and 2.
Check that the resistance is within the specification.
Specification : Refer to "Specification"
Turn the ignition switch OFF and disconnect the battery negative (-) cable.
Disconnect the ETC Module Connector (A).

Remove the intercooler outlet hose.
(Refer to Engine Mechanical System - "Intercooler")
Remove the ETC module (A) after loosening the mounting bolts.
Tightening Torque :
9.8 - 11.8 N.m (1.0 - 1.2 kgf.m, 7.2 - 8.7 lb.ft)

Install the component with the specified torques.
Note that internal damage may occur when the component is dropped. If the component has been dropped, inspect before installing.
Install in the reverse order of removal.
Remove the ETC Module.
(Refer to Engine Control System - "ETC System")
Keep the ETC module plate (A) open.

Clean the pollutant in the throttle body with a soft cloth moistened with cleaning fluid.

Do not spray cleaning fluid directly onto ETC. Use a lint free cloth moistened with cleaning fluid.
Be careful not to clean the coating fluid around the shaft. If coating fluid is removed, idling control failure might occur by foreign substance inflow or excessive air leakage.
After cleaning, re-install the ETC module and then perform the ETC module learning procedure.
(Refer to Engine Control System - "ETC System" - Adjustment)
ETC Module Learning Procedure
Be sure to perform the ETC module learning procedure when replacing or re-installing the ETC module.
Wait for 1 minute with the ignition switch ON.
Start the engine and hold the idle status for 15 minutes.
Waif for 1 minute with the ignition switch OFF.
Restart the engine, and check that the idle speed is stable.
If the ETC module learning procedure is not performed after replacing or reinstalling the ETC module, MIL illumination with DTCs may occur.

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