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

Kia Rio 2017-2020 YB Service Manual / Engine Control / Fuel System / Engine Control System / ETC (Electronic Throttle Control) System

Specifications
Specification

ETC Module

Throttle Position Sensor (TPS) [integrated into ETC Module]

▷ Type: Hall IC Non-contact sensor type

▷ 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
98
4.65
0.35
C.T (0)
0.5
4.5
W.O.T (86)
4.41
0.59

DC Motor [integrated into ETC module]

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.

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

Repair procedures
Inspection

Throttle Position Sensor (TPS)

1.

Connect the KDS/GDS on the Data Link Connector (DLC).

2.

Start the engine and measure the output voltage of TPS 1 and 2 at C.T. and W.O.T.

[Throttle Position Sensor (TPS)]

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
98
4.65
0.35
C.T (0)
0.5
4.5
W.O.T (86)
4.41
0.59

ETC Motor

1.

Switch "OFF" the ignition.

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: 0.3 - 100 Ω [20°C (68 °F)]

Removal
1.

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

2.

Remove the air cleaner assembly.

(Refer to Intake And Exhaust System - "Air Cleaner")

3.

Disconnect the ETC module connector (A).

4.

Disconnect the vapor hose (B).

5.

Remove the installation bolts, and then remove the ETC module (C) from the engine.

Electronic throttle body mounting bolt :

7.8 - 9.8 N.m (0.8 - 1.0 kgf.m, 5.8 - 7.2 lb-ft)

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.

1.

Installation is reverse of removal.

Adjustment
ETC module learning procedure

Be sure to perform the ETC module learning procedure when replacing or reinstalling the ETC module.

1.

Wait for 1 minute with the ignition switch ON.

2.

Start the engine and keep it idle 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.

Troubleshooting
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°

  

When throttle value is stuck at 5°, engine speed is limited at below 1,500rpm and vehicle speed at maximum 40 ~ 50 km/h (25 ~ 31 mph)

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