Component Inspection

Visual Inspection of HO2S.
1. Visually/physically inspect following items:
  - Inspect the front HO2S for Contaminated, deteriorated or aged Front HO2S.
  - If contamination is evident on the HO2S, replace contaminated sensor.
2. Is the HO2S visually/physically OK?
  YES
  - Go to " 2 Check Performance of HO2S" as below.
  NO
  - Substitute with a known - good HO2S and check for proper operation.
    If the problem is corrected, replace HO2S and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
Check performance of HO2S.
1. Connect scantool & Engine "ON".
2. Warm-up the engine to normal engine temperature.
3. Monitor signal waveform of HO2S with scantool.
  1. Specification: Verify that the HO2S staying time below or upper the for rich/lean:
    Engine Running Condition: less than 127 sec, Under the designated condition; less than 30 sec
    
    Fig 1: Scantool Display - HO2S Signal Waveform
4. Is the sensor switching properly?
  YES
  - Go to " 3 Check PCM" as below.
  NO
  - Substitute with a known - good HO2S and check for proper operation.
    If the problem is corrected, replace HO2S and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
Check PCM.
1. Ignition "OFF".
2. Connect Scantool and Ignition "ON".
3. Select simulation function on scantool.
4. Simulate voltage at terminal 1 of HO2 sensor signal connector.
  
  Fig 2: Scantool Display - Simulate Voltage At Terminal 1 Of HO2 Sensor Signal Connector
5. Does the HO2 sensor signal value changes according to simulation voltage?
  YES
  - Fault is intermittent caused by poor contact in the sensor's and/or PCM's connector. 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 PCM and check for proper operation.
    If the problem is corrected, replace PCM and go to "VERIFICATION OF VEHICLE REPAIR " procedure.