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 re-do 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 as below. [In the case of installing used ECM/PCM]

     1. Perform "ECM Neutral mode" procedure with GDS. (Refer to "Immobilizer NEUTRALIZATION STATUS CHECK ")
     2. After finishing "ECM Neutral mode", perform "Key teaching" procedure with GDS. (Refer to "Immobilizer SMART KEY CODE SAVING ")

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

     1. Perform "ECM Neutral mode" procedure with GDS. (Refer to "Smart key NEUTRALIZATION STATUS CHECK ")
     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 re-do 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).