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Home >> Kia >> 2007 >> Rondo Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> DTC Troubleshooting Procedures (1 Of 2) - 2.4L >> DTC P0140 Ho2S Circuit No Activity Detected (Bank 1 / Sensor 2) >> Component Inspection

Component Inspection

  1. Visually/physically inspect the following conditions:
    • Ensure that the sensor is securely installed
    • Check for corrosion on terminals
    • Check for damaged wiring
    • Repair as necessary and go to next step
  2. Warm up the engine to normal operating temperature and let it idle.
  3. Connect Scan Tool and monitor the O2 SNSR VOL.-B1/S2 parameter on the Scan Tool data list.

    Specification : Refer to "SIGNAL WAVEFORM & DATA " in the "General Information" procedure. Verify signal is switching from rich (above 0.45V) to lean (below 0.45V) a minimum of 3 times in 10 seconds (voltage will vary between 0.1 and 0.9V) at idle.

  4. Is sensor switching properly?

    YES 

    • Check for poor connection between ECM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection. Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure

    NO 

    • Check HO2S for contamination, deterioration, or damage. Substitute with a known-good HO2S and check for proper operation. If the problem is corrected, replace HO2S and then go to "VERIFICATION OF VEHICLE REPAIR " procedure
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