KIA CARNIVAL 2007 Workshop Manual

2007 > 2.7L V6 GASOLINE >
INSPECTION
FUNCTION AND OPERATION PRICIPLE
Heated Oxygen Sensor (HO2S) consists of zirconium and alumina and is installed on upstream and downstream of the
Manifold Catalyst Converter (MCC). After it compares oxygen consistency of the atmosphere with the exhaust gas, it
transfers the oxygen consistency of the exhaust gas to the PCM. When A/F ratio is rich or lean, it generates
approximately 1V or 0V respectively. In order that this sensor normally operates, the temperature of the sensor tip is
higher than 370°C (698°F). So it has a heater which is controlled by the PCM duty signal. When the exhaust gas
temperature is lower than the specified value, the heater warms the sensor tip.
SPECIFICATION
A/F Ratio Output Voltage (V)
RICH 0.80 ~ 0.92
LEAN 0.1
Item Specification

Heater Resistance (Ω)3.0 ~ 4.0Ω at 21°C (69.8°F)
WAVEFORM
CIRCUIT DIAGRAM

COMPONENT INSPECTION
1.Check signal waveform of HO2S using a scantool.
Specification: Refer to "waveform".
2. Disconnet the HO2S connector.
3. Measure resistance between HO2S heater terminals 3 and 4.

4.Check that the resistance is within the specification.
Specification: Refer to SPECIFICATION.

CVVT Oil Temperature Sensor(OTS)

2007 > 2.7L V6 GASOLINE >
INSPECTION
FUNCTION AND OPERATION PRICIPLE
The CVVT Oil Temperature Sensor (OTS) is a negative coefficient thermistor used by the PCM tl measure engine oil
temperature for the purpose of adjusting CVVT calculations.
SPECIFICATION
Temperature Resistance (kΩ)
°C °F
- 40 - 4052.0
- 20 -416.5
0 32 6.0
20 682.45
40 104 1.10
60 1400.544
80 1760.290
100 2120.164
120 2480.099
CIRCUIT DIAGRAM

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

Knock Sensor(KS)

2007 > 2.7L V6 GASOLINE >
INSPECTION
FUNCTION AND OPERATION PRICIPLE
Knocking is a phenomenon characterized by undesirable vibration and noise and can cause engine damage. Knock
Sensor (KS) senses engine knocking and the two sensors are installed inside the V- valley of the cylinder block. When
knocking occurs, the vibration from the cylinder block is applied as pressure to the piezoelectric element. At this time,
this sensor transfers the voltage signal higher than the specified value to the PCM and the PCM retards the ignition
timing. If the knocking disappears after retarding the ignition timing, the PCM will advance the ignition timing. This
sequential control can improve engine power, torque and fuel economy.
SPECIFICATION
Item Specification
Capacitance (pF) 950 ~ 1,350pF
WAVEFORM

CIRCUIT DIAGRAM