Component Inspection

■ Downstream O2 Sensor Inspection 

1. Ignition "OFF"
2. Connect VMI to GDS and set up an oscilloscope as follow (2 - channel);

   Channel A (+): Pin No. 1 (Signal) terminal of Upstream O2 Sensor.

   Channel A (-): Ground

   Channel B (+): Pin No. 1 (Signal) terminal of Downstream O2 Sensor.

   Channel B (-): Ground

3. Ignition "ON" & Engine "ON"
   Fig 1: Screen Display - Upstream O2 Sensor And Downstream O2 Sensor Signal Waveform (Warm-Up Condition)

   Courtesy of KIA MOTORS AMERICA, INC.
4. Is measured value within speechification?

   YES 

   • Carefully redo this troubleshooting guide steps.
   • If the diagnostics have been performed correctly with no failure found, replace the ECM and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
     CAUTION: When replacing the ECM/PCM, the vehicle equipped with the immobilizer must be performed procedure below. [In the case of installing used ECM/PCM]

     1. Perform "ECM Neutral Mode" procedure with GDS. (Refer to "SMART KEY " in BE procedure)
     2. After finishing "ECM Neutral Mode", perform "Key teaching" procedure with GDS. (Refer to "SMART KEY " in BE procedure)

     
     [In the case of installing new ECM/PCM]
     Perform "Key Teaching" procedure with GDS. (Refer to "SMART KEY " in BE procedure)
     CAUTION: When replacing the ECM/PCM, the vehicle equipped with the smart key system (Button start) must be performed procedure below.
     [In the case of installing used ECM/PCM]

     1. Perform "ECM Neutral Mode" procedure with GDS. (Refer to "SMART KEY " in BE procedure)
     2. After finishing "ECM Neutral Mode", insert the key (or press the start button) and turn it to the IGN ON and OFF position. Then the ECM/PCM learns the smart key information automatically.

     
     [In the case of installing new ECM/PCM]
     Insert the key (or press the start button) and turn it to the IGN ON and OFF position. Then the ECM/PCM learns the smart key information automatically.

   NO 

   • Carefully redo this troubleshooting guide steps.
   • If no problems were found with the circuits or connectors, Replace the Downstream O2 Sensor and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
     CAUTION:

     • Install the component with the specified torques.
     • Note that internal damage may occur when the component is dropped or mistreated.
     CAUTION:

     • DO NOT use a cleaner, spray, or grease to sensing element and connector of the sensor because oil component in them may cause malfunction or affects on sensor performance.
     • Sensor and its wiring may be damaged in case of contacting with the exhaust system (Exhaust Manifold, Catalytic Converter, and others).