Component Inspection

Visual Inspection of HO2S.
1. Visually/physically inspect following items:
  1. Inspect the rear HO2S for Contaminated, deteriorated or aged Rear HO2S.
  2. If contamination is evident on the HO2S, replace contaminated sensor.
2. Is the HO2S visually/physically OK?
  YES
  - Go to " 2 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" & Engine "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 1: Simulating 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.