Component Inspection

Visual Inspection.
1. IG "OFF"
2. Disconnect HO2S (B1/S1) connector.
3. Check that HO2S (B1S1) is contaminated or damaged by foreign materials.
4. Has a problem been found?
  YES : --> Go to "Check HO2S (B1/S1) performance" as follows.
  
  NO : --> Substitute with a known - good HO2S (B1/S1) and check for proper operation.
  
  --> If the problem is corrected, replace HO2S (B1/S1) and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
Check HO2S (B1/S1) performance.
1. IG "OFF".
2. Connect probe to terminal 2 of HO2S (B1/S1) connector and select oscilloscope function with scantool.
3. Warm up the engine to normal operating temperature.
4. Measure signal waveform of HO2S (B1/S1) with scantool.
  
  Fig 1: Heated Oxygen Sensor Signal Waveform Graph
  Courtesy of HYUNDAI MOTOR CO.
5. Is the measured signal waveform within specification?
  YES : --> Go to "Check ECM/PCM" as follows.
  
  NO : --> Substitute with a known - good HO2S (B1/S1) and check for proper operation.
  
  --> If the problem is corrected, replace HO2S (B1/S1) and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
Check ECM/PCM.
1. IG "OFF" and disconnect B1S1 connector.
2. Connect scantool and Key "ON".
3. Select simulation function on scantool.
4. Simulate voltage at terminal 2 of HO2S (B1/S1) signal connector.
  
  Fig 2: Scantool Display - Simulation Of Voltage
  Courtesy of HYUNDAI MOTOR CO.
5. Does the signal value of HO2S (B1/S1) change according to simulation voltage?
  YES : --> Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  
  NO : --> Substitute with a known - good ECM/PCM and check for proper operation.
  
  --> If the problem is corrected, replace ECM/PCM and go to "VERIFICATION OF VEHICLE REPAIR " procedure.