Repair Procedures: Inspection

1. The engine control system can be more quickly diagnosed for problems by using the KDS (Refer to "DTC INDEX ").
   1. Self diagnosis: Checking failure and Diagnosis Trouble Code (DTC)
   2. Data analysis: Checking the system input/output data state
   3. Actuation test: Checking the system operation condition.
   4. Software Management: Controlling other features including system option setting and Zero-Adjustment

Inspection component 

1. Disconnect the battery negative (-) terminal.
2. Disconnect the Heated Oxygen Sensor (HO2S) connector.
3. Measure resistance between the HO2S terminals.

   Front:  Pin 4 to Pin 5

   Rear:  Pin 3 to Pin 4

   Courtesy of KIA MOTORS AMERICA, INC.

   Terminal	Function
   	Front	Rear
   1	Virtual Ground	Signal
   2	Nernst Cell Voltage	Ground
   3	Pumping Cell Voltage	Heater (+)
   4	Heater (+)	Heater (-)
   5	Heater (-)	-
   6	Trim register	-

4. Compare the measured resistance with the specification.

   Specification: 

   Front: 2.8 - 4.5 Ω [18 - 28°C (64.4 - 82.4°F)]

   Rear: 5.4 - 6.6 Ω [18 - 28°C (64.4 - 82.4°F)]