2007 KIA CARNIVAL Workshop Manual

Engine Coolant
Temperature Sensor (ECTS)

2007 > 2.7L V6 GASOLINE >
INSPECTION
FUNCTION AND OPERATION PRICIPLE
Engine Coolant Temperature Sensor (ECTS) is located in the engine coolant passage of the cylinder head for
detecting the engine coolant temperature. The ECTS uses a thermistor whose resistance changes with the
temperature. The electrical resistance of the ECTS decreases as the temperature increases, and increases as the
temperature decreases. The reference 5 V in the PCM is supplied to the ECTS via a resistor in the PCM.That is, the
resistor in the PCM and the thermistor in the ECTS are connected in series. When the resistance value of the
thermistor in the ECTS changes according to the engine coolant temperature, the output voltage also changes. During
cold engine operation the PCM increases the fuel injection duration and controls the ignition timing using the
information of engine coolant temperature to avoid engine stalling and improve drivability.
SPECIFICATION
Temperature Resistance(kΩ)
°C °F
- 40 - 4048.14
- 20 -414.13 ~ 16.83
0 325.79
20 682.31 ~ 2.59
40 104 1.15
60 140 0.59
80 176 0.32
CIRCUIT DIAGRAM

COMPONENT INSPECTION
1.Turn ignition switch OFF.
2. Disconnect ECTS connector.
3. Remove the ECTS.
4. After immersing the thermistor of the sensor into engine coolant, measure resistance between ECTS terminals 1
and 3.
5.Check that the resistance is within the specification.
Specification: Refer to SPECIFICATION.

Accelerator Position Sensor(APS)

2007 > 2.7L V6 GASOLINE >
INSPECTION
FUNCTION AND OPERATION PRICIPLE
Accelerator Position Sensor (APS) is installed on the accelerator pedal module and detects the rotation angle of the
accelerator pedal. The APS is one of the most important sensors in engine control system, so it consists of the two
sensors which adapt individual sensor power and ground line. The second sensor monitors the first sensor and its
output voltage is half of the first one. If the ratio of the sensor 1 and 2 is out of the range (approximately 1/2), the
diagnostic system judges that a malfunction has occurred.
SPECIFICATION
Pedal Position Output Voltage (V) [Vref = 5.0V]
APS1 APS2
C.T 0.7 ~ 0.8V 0.29 ~ 0.46V
W.O.T 3.85 ~ 4.35V 1.93 ~ 2.18V
Item Sensor Resistance
APS1 0.7 ~ 1.3kΩ at 20°C (68°F)
APS2 1.4 ~ 2.6kΩ at 20°C (68°F)
CIRCUIT DIAGRAM

COMPONENT INSPECTION
1.Connect a scantool on Diagnoisis Link Connector (DLC).
2. Start engine and check output voltages of APS 1 and 2 at C.T and W.O.T.
Specification
Condition Output Voltage (V)
APS1 APS2
C.T 0.70 ~ 0.80 0.29 ~ 0.46
W.O.T 3.85 ~ 4.35 1.93 ~ 2.18
3. Turn ignition switch OFF and disconnect the scantool from the DLC.
4. Disconnect APS connector and measure resistance between APS terminals 5(6) and 4(5) (APS 1).
Specification: Refer to SPECIFICATION.
5. Disconnect APS connector and measure resistance between APS terminals 6(3) and 2(4) (APS 2).

Specification: Refer to SPECIFICATION.

Heated Oxygen Sensor(HO2S)