Kia Optima: Engine Control System / ETC (Electronic Throttle Control) System
Specifications
Throttle angle (°)
|
Output voltage (V) [Vref = 5.0V]
|
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
| • |
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
1. ETC (Electronic Throttle Control)
|
|
Schematic diagrams
Harness Connector
Repair procedures
| 1. |
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).
|
| 2. |
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]
|
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.
|
| 2. |
Measure resistance between the ETC module terminals 1 and 2.
|
Specification : 0.3 - 100 Ω (20 °C (68 °F))
|
|
| 1. |
Disconnect the negative battery terminal.
|
| 2. |
Remove the air cleaner.
(Refer to Engine Mechanical System - "Air Cleaner")
|
| 3. |
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).
|
| • |
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")
|
| • |
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.
|
| 1. |
Remove the ETC.
(Refer to ETC - "Removal")
|
Cleaning the ETC after removing it.
|
|
| 2. |
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
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)
|
Components and components location
Component Location
1. Engine Control Module (ECM)
Schematic diagrams
Connector and Terminal function
...
Specifications
Specification
Manifold Absolute Pressure Sensor (MAPS)
Pressure
Output Voltage (V)
kPa
kgf/cm²
...
Other information:
Schematic diagrams
Connector and Terminal funciton
Repair procedures
Removal
1.
Disconnect the negative battery terminal.
2.
Remove the crash pad lower panel.
(Refer to Body - "Crash Pad Lower Panel")
...
Components and components location
Components
1. Strut complete
2. Roll rod bracket
3. Sub frame
4. Stabilizer bar
5. Steering gear box
6. Dynamic damper
7. Sub frame stay
...
Engine Control Module (ECM)
Manifold Absolute Pressure Sensor (MAPS) & Intake Air Temperature Sensor (IATS)