Hyundai Tucson: Engine Control System / ETC (Electronic Throttle control) System

- Description 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.

- Specification Throttle Position Sensor (TPS) ▷ Type : Absolute Rotary Sensor IC▷ Specification

Throttle angle (˚)	Output Voltage (V) [Vref=5V]
	TPS1	TPS2
0	0.5	4.5
10	0.96	4.05
20	1.41	3.59
30	1.87	3.14
40	2.32	2.68
50	2.78	2.23
60	3.23	1.77
70	3.69	1.32
80	4.14	0.86
90	4.6	0.41
91.2	4.65	0.35
C.T (0˚)	0.5	4.5
W.O.T (82˚)	4.23	0.77

[ETC Motor]

Item	Specification
Type	DC Motor
Operating Voltage (V)	7.5 - 16
Coil Resistance (Ω)	1.10 - 1.34 (Room Temperature)

- Fail-safe Mode

Item	Fail-Safe
ETC Motor	Throttle valve stuck at 5°
TPS	TPS 1 fault	ECM looks at TPS2
	TPS 2 fault	ECM looks at TPS1
	TPS 1, 2 fault	Throttle valve stuck at 5°
APS	APS 1 fault	ECM looks at APS 2
	APS 2 fault	ECM looks at APS 1
	APS 1, 2 fault	Throttle valve stuck at 5°

- Schematic Diagram

- Circuit Diagram

Harness Connector

- Inspection

1.In the engine control system, failure can be quickly diagnosed by using the diagnosis tool.

(1)Self diagnosis : Checking failure and code number (DTC).

(2)Current data : Checking the system input/output data state.

(3)Actuation test : Checking the system operation condition.

(4)Additional function : Controlling other features including system option setting and zero point adjustment.

Throttle Position Sensor (TPS)

1.Connect a diagnostic tool on the Data Link Connector (DLC).

2.Start engine and check output voltages of TPS 1 and 2 at C.T and W.O.T.

Specification : Refer to Specification Section.

ETC Motor

1.Turn the ignition switch OFF.

2.Disconnect the ETC module connector.

3.Measure resistance between the ETC module terminals 1 and 2.

4.Check that the resistance is within the specification.

Specification : Refer to Specification Section.

- Removal

1.Turn the ignition switch OFF and disconnect the battery negative (-) cable.

2.Remove the resonator and the air intake hose.(Refer to Engine Mechanical System - "Air Cleaner")

3.Disconnect the ETC module connector (A).

4.Remove the ETC Module (A) after loosening the mounting bolt.

Electronic throttle body Installation bolt :9.8 - 11.8 N.m (1.0 - 1.2 kgf.m, 7.2 - 8.7 lb-ft)

- Cleaning

1.Remove the ETC Module.(Refer to ETC System - "Removal")

2.Clean the pollutant in the throttle body using 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.

3.Remove the ETC Module.(Refer to ETC System - "Installation")

4.Reset the ECM adaptive values after replacing the ETC.

5.Perform the ETC learning procedure.(Refer to ETC System - "Adjustment")

- Installation

   

• 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.

• When installing the throttle body, be careful not to get foreign material into the throttle body.

1.Install in the reverse order of removal.

2.Reset the ECM adaptive values after replacing the ETC.

3.Perform the ETC learning procedure(Refer to ETC System - "Adjustment")

- Adjustment ETC Module Learning Procedure Be sure to perform the ETC module learning procedure when replacing or re-installing the ETC module.

1.Wait for 1 minute with the ignition switch ON.

2.Start the engine and hold the idle status for 15 minutes.

3.Waif for 1 minute with the ignition switch OFF.

4.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.