Kia Optima: Engine Control System / ETC (Electronic Throttle Control) System

Kia Optima DL3 2019-2024 Service and Repair Manual / Engine Control / Fuel System / Engine Control System / ETC (Electronic Throttle Control) System

Specifications

Specification

Throttle angle (°)	Output voltage (V) [Vref = 5.0V]
Throttle angle (°)	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
98	4.65	0.35
C.T (0)	0.5	4.5
W.O.T (86)	4.41	0.59

[ETC Motor]

Item	Specification
Coil Resistance (Ω)	0.3 - 100 [20°C(68°F)]

Description and operation

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.

Components and components location

Components Location

1. ETC (Electronic Throttle Control)

Schematic diagrams

Circuit Diagram

Harness Connector

Repair procedures

Inspection

The engine control system can be more quickly diagnosed for troubles by using the vehicle diagnostic system (KDS). (Refer to "DTC guide")

KDS provides the following information.

(1)	Self diagnosis : Inspects and displays diagnostic trouble code (DTC)

(2)	Sensor data : Checks the system input/output value status

(3)	Forced operation : Checks the system operating status

(4)	Additional function : Controls system options, zero point adjustment and other functions

Throttle Position Sensor (TPS)

1.	Connect the KDS 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.

Throttle angle (°)	Output voltage (V) [Vref = 5.0V]
Throttle angle (°)	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
98	4.65	0.35
C.T (0)	0.5	4.5
W.O.T (86)	4.41	0.59

ETC Motor

1.	Disconnect the ETC module connector.

Measure resistance between the ETC module terminals 1 and 2.

Specification : 0.3 - 100 Ω (20 °C (68 °F))

Removal

1.	Disconnect the negative battery terminal.

2.	Remove the air cleaner. (Refer to Engine Mechanical System - "Air Cleaner")

After disconnecting the connector (A), remove the ETC module by loosening the bolts (B).

Tightening torque :

7.8 - 11.8 N·m (0.8 - 1.2 kgf·m, 5.8 - 8.7 lb·ft)

4.	Separate the coolant hoses (A) from the ETC module (B).

Installation

•	Install the component with the specified torque.

•	Note that internal damage may occur when the component is dropped. In this case, use it after inspecting.

1.	Install in the reverse order of removal.

2.	Supplement the engine coolant. (Refer to Engine Mechanical System - "Coolant")

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

4.	Perform the ETC learning procedure. (Refer to ETC (Electronic Throttle Control) System - "Adjustment")

Adjustment

•	Must perform the ETC learning procedure after replacing or reinstalling the ETC.

•	If not performing the ETC learning procedure after replacing or re-installing, MIL or DTCs might occur.

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, check that the idle speed is stable.

Cleaning

Remove the ETC.

(Refer to ETC - "Removal")

Cleaning the ETC after removing it.

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

•	Take care not to getting into foreign matter for ETC.

•	Do not spray cleaning fluid to ETC directly and use a lint free cloth moistened by cleaning fluid.

•	Be careful as fingers or cloth may get caught in the valve.

•	Be careful not to clean the coating fluid around the shaft. If coating fluid is removed, idling control failure might occur by foreign matter inflow or excessive air leakage.

3.	Install the ETC. (Refer to ETC - "Installation")

4.	Reset the ETC adaptive value.

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

Troubleshooting

Fail-Safe Mode

Item	Fail-Safe
ETC Motor	Throttle valve stuck at 7°
TPS	TPS 1 fault	Replace it with TPS 2
	TPS 2 fault	Replace it with TPS 1
	TPS 1,2 fault	Throttle valve stuck at 7°
APS	APS 1 fault	Replace it with APS 2
	APS 2 fault	Replace it with APS 1
	APS 1,2 fault	Engine idle state

When throttle value is stuck at 7°, engine speed is limited at below 1,500rpm and vehicle speed at maximum 40 - 50 km/h (25 - 31 mph)

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