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Home >> Kia >> 2009 >> Rio Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> DTC Troubleshooting Procedures (1 Of 2) >> DTC P0134 Ho2S Circuit No Activity Detected (Bank 1/Sensor 1) >> Component Inspection
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Component Inspection

  1. 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 step  2.

      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.
  2. Check HO2S (B1/S1) performance.
    1. IG "OFF".
    2. Connect probe to terminal 2 of HO2S (B1/S1) connector and select oscilloscope function with scan tool.
    3. Warm up the engine to normal operating temperature.
    4. Measure signal waveform of HO2S (B1/S1) with scan tool.
      Fig 1: Scan Tool Display - Signal Waveform Of HO2S (B1/S1)
      G04862154Courtesy of KIA MOTORS AMERICA, INC.
    5. Is the measured signal waveform within specification?

      YES 

      • Go to step  3.

      NO 

      • Substitute with a known-good HO2S (B1/S1) and check for proper operation.
  3. Check ECM/PCM.
    1. IG "OFF" and disconnect B1S1 connector.
    2. Connect scan tool and Key "ON".
    3. Select simulation function on scan tool.
    4. Simulate voltage at terminal 2 of HO2S (B1/S1) signal connector.
      Fig 2: Scan Tool Display - Simulate Voltage Of HO2S (B1/S1)
      G04862155Courtesy of KIA MOTORS AMERICA, INC.
    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.
NOTE: There is a memory reset function on scan tool that can erase optional parts automatically detected and memorized by ECM/PCM.
Before or after testing ECM/PCM on the vehicle, use this function to reuse the ECM/PCM
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