O2 Sensor Inspection

■ O2 Sensor Signal Inspection 

1. Ignition "OFF".
2. Connect VMI to KDS/GDS and set up an oscilloscope as follow (4-channel);

   Channel A (+): Pin No. 3 (V_IP) 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.
   1. Approx. 2500 RPM.
   2. Fuel Cut after acceleration.
4. Is the measured value within specification?

   YES 

   • Go to next procedure.

   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 mis-treated.
   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).

■ MAP Sensor Inspection 

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

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

   Channel A (-): Ground

   Channel B (+): Pin No. 4 (TPS1 Signal) terminal of Throttle Body.

   Channel B (-): Ground

3. Ignition "ON" & Engine "ON".
4. Testing Condition: Idle to Acceleration.

   Specification:  Refer to below

   Fig 2: Screen Display - Normal MAP Sensor And TPS 1 Sensor Waveform At Idle To Acceleration

   Courtesy of KIA MOTORS AMERICA, INC.
5. Is the measured value within specification?

   YES 

   • Go to next procedure.

   NO 

   • Carefully re-do this troubleshooting guide steps.
   • If no problems were found with the circuits or connectors, replace MAP 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 mis-treated.
   CAUTION:

   • Insert the sensor in the installation hole and be careful not to damage.