Kia Carnival (2009+). Manual — part 258

2009 > G 2.7 DOHC >

INSPECTION

FUNCTION AND OPERATION PRICIPLE

ETC (Electronic Throttle Control) system is electronically controlled throttle device which controls the throttle valve. It
consists of ETC motor, throttle body and throttle position sensor (TPS). A mechanical throttle control system receives a
driver's intention via a wire cable between the accelerator and the throttle valve, while this ETC system uses the signal
from the Accelerator Position Sensor (APS) installed on the accelerator pedal. After the PCM receives the APS signal
and calculates the throttle opening angle, it activates the throttle valve by using the ETC motor. Additionally, it can
handle cruise control function without any special devices.

SHEMATIC DIAGRAM

SPECIFICATION

[THROTTLE POSITION SENSOR]

Throttle Angle(°)

Output Voltage(V) [Vref = 5.0V]

TPS1

TPS2

0°

0V

5.0V

10°

0.5V

4.5V

20°

0.9V

4.1V

30°

1.4V

3.6V

40°

1.8V

3.2V

50°

2.3V

2.7V

60°

2.7V

2.3V

70°

3.2V

1.8V

80°

3.6V

1.4V

90°

4.1V

0.9V

100°

4.5V

0.5V

110°

5.0V

0V

Item

Sensor Resistance

TPS1

4.0 ~ 6.0k! at 20°C (68°F)

TPS2

2.7 ~ 4.1k! at 20°C (68°F)

[ETC MOTOR]

Item

Sensor Resistance

Coil Resistance (!)

1.275 ~ 1.725! at 20°C (68°F)

CIRCUIT DIAGRAM

FAIL-SAFE MODE

Mode

Description

Symptom

Possible Cause

• ETC system can't proceed reliable

algorithm procedure

MODE 1

FORCED ENGINE

SHUTDOWN

Engine stop

algorithm procedure

- Fatal PCM internal programming error
- Faulty intake system or throttle body

MODE 2

FORCED IDLE &

POWER

MANAGEMENT

Forced idle state controlled by
fuel quantity regulation and
ignition timing adjustment

• ETC system can't control engine power

via throttle device

• Disabled throttle control or broken throttle

position information

MODE 3

FORCED IDLE

Forced idle state and no response
for accelerator activation

• No information about the accelerator

position

- Malfuctioning APS 1 and 2, faulty A/D

converter or internal controller

MODE 4

LIMIT

PERFORMANCE &

POWER

MANAGEMENT

Engine power is determined by
accelerator position and idle
power requirement (Limited
vehicle running)

• ETC system can't securely control engine

power

MODE 5

LIMIT

PERFORMANCE

1. Engine power varies with

accelerator position, but driver
perceives lack of engine
power.

2. MIL ON (Normal vehicle

running)

• Not reliable accelerator position signal or

bad maximum power generation

- Faulty APS, ignition voltage or internal

controller

MODE 6

NORMAL

Normal

COMPONENT INSPECTION

1. Connect a scantool on Diagnoisis Link Connector (DLC).

2. Start engine and check output voltages of TPS 1 and 2 at C.T and W.O.T.

Condition

Output Voltage (V)

TPS 1

TPS 2

C.T

0.25 ~ 0.9V

Min. 4.0V

W.O.T

Min. 4.0V

0.25 ~ 0.9V

3. Turn ignition switch OFF and disconnect the scantool from the DLC.

4. Disconnect ETC module connector and measure resistance between ETC module terminals 4 and 1 (TPS 1).

5. Measure resistance between ETC module terminals 7 and 6 (TPS 2).

Specification: Refer to SPECIFICATION.

ETC MOTOR

1. Disconnect ETC module connector and measure resistance between ETC module terminals 5 and 8.