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

Kia Picanto JA 2017-2022 Service & Repair Manual / Engine Control / Fuel System / Engine Control System / ETC (Electronic Throttle Control) System

Specifications
Specification
Sensor
Item
Opening Percentage (%)
Output Voltage (V) [Vref = 5V]
TPS1
C.T
8.5 - 11.5
0.43 - 0.58
W.O.T
88 - 96
4.40 - 4.80
TPS2
C.T
88.5 - 91.5
4.43 - 4.58
W.O.T
2 - 10
0.10 - 0.50
Fail Safe
Throttle valve stuck at 5°
Supply Voltage (V)
4.8 - 5.2
Type
Hall IC Non-contact sensor [Integrated into ETC Module]

Motor
Item
Specification
Coil Resistance (Ω)
0.3 - 100 [20°C(68°F)]
Maximum Allowable Current (A)
< 10.0
Type
DC Motor [Integrated into ETC Module]

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
[A/T]

[M/T]

Repair procedures
Inspection
Throttle Position Sensor (TPS)
1.
Connect the KDS 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.
Item
Opening Percentage (%)
Output Voltage (V) [Vref = 5V]
TPS1
C.T
8.5 - 11.5
0.43 - 0.58
W.O.T
88 - 96
4.40 - 4.80
TPS2
C.T
88.5 - 91.5
4.43 - 4.58
W.O.T
2 - 10
0.10 - 0.50

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 : 0.3 - 100 Ω [20°C(68°F)]
Removal
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.
Disconnect the ETC module connector (A).
4.
Remove the installation bolts (B) and then remove the ETC module from the engine.
Electronic Throttle Control module mounting 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 Engine Control System - "ETC System")
2.
Keep the ETC module plate (A) open.

3.
Clean the pollutant in the throttle body using a soft cloth moistened with clearning fluid.

   
Do not directly spray cleaning fluid to ETC module. Instead, use a lint free cloth moistened with cleaning fluid.
Be careful not to remove the coating fluid around the shaft. If coating fluid is removed, idling control failure may occur due to inflow of foreign substances or excessive air leakage.
4.
After cleaning, reinstall the ETC module and then perform the ETC module learning procedure.
(Refer to Engine Control System - "ETC System" - Adjustment)
Installation
   
Install the component to 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 using a cloth moistened with cleaner.
Do not spray the engine cleaner on the throttle body.
Be careful as fingers or cloth may get caught in the valve.
When installing the throttle body, keep foreign materials away from the throttle body.
Fill with engine coolant.
(Refer to Engine Mechanical System - "Coolant")
1.
Install in the reverse order 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
Engine idle state

   
When throttle value is stuck at 5°, engine speed will be limited to below 1,500 rpm and vehicle speed at maximum 40 - 50 km/h (25-31 mph).
Engine Control Module (ECM)
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