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

Kia Forte 2019-2024 (BD) Service Manual / Engine Control / Fuel System / Engine Control System / ETC (Electronic Throttle Control) System

Specifications

Specification

Throttle angle(°)	Output Voltage (V)
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)	1.38 [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.

1. Dry bearing
2. DC motor
3. Non-contact hall sensor
4. Gear

5. Magnet
6. Hall IC
7. Yoke
8. Stator

Schematic Diagram

Schematic diagrams

Circuit Diagram

Harness Connector

Repair procedures

Inspection

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.

[TPS1]

Item	Opening Percentage (%)	Output Voltage (V) [Vref = 5V]
C.T	7 - 13	0.35 - 0.65
W.O.T	88.6 - 94	4.43 - 4.70

[TPS2]

Item	Opening Percentage (%)	Output Voltage (V) [Vref = 5V]
C.T	87 - 93	4.35 - 4.65
W.O.T	6 - 11.4	0.3 - 0.57

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.

Check that the resistance is within the specification.

Specification : 1.38 Ω [20°C(68°F)]

Removal & Installation

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

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

3.	Remove the intercooler outlet hose.

4.	Disconnect the ETC module connector (A) and vapor hose (B).

5.	Disconnect the coolant hoses (C).

Remove the ETC module (D) mounting bolts.

Electronic Throttle Control moule mounting bolt:

9.8 - 11.8 N·m (1.0 - 1.2 kgf·m, 7.2 - 8.7 lb·ft)

Install in the reverse order of removal.

•	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 cleaning the throttle body, clean the valve and carbon at the bore with the cloth wetted by cleaner.

•	Do not spray the engine cleaner on the throttle body.

•	Be careful that fingers or cloth are not caught in the valve.

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

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.

Restart the engine, check that the idle speed is stable.

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

Troubleshooting

Fail-Safe Mode

Item	Fail-Safe
ETC Motor	Throttle valve stuck at 7°
TPS	TPS 1 fault	ECM looks at TPS2
	TPS 2 fault	ECM looks at TPS1
	TPS 1,2 fault	Throttle valve stuck at 7°
APS	APS 1 fault	ECM looks at APS 2
	APS 2 fault	ECM looks at APS 1
	APS 1,2 fault	Engine idle state

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

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