Component Inspection

Visual Inspection.
1. IG "OFF"
2. Disconnect HO2S (B1/S2) connector.
3. Check that HO2S (B1S2) is contaminated or damaged by foreign materials.
4. Has a problem been found?
  YES : --> Go to "Check ECM/PCM" as follows.
  
  NO : --> Substitute with a known - good HO2S (B1/S2) and check for proper operation.
  
  --> If the problem is corrected, replace HO2S (B1/S2) and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
Check ECM/PCM.
1. IG "OFF" and disconnect B1S2 connector.
2. Connect scantool and Key "ON".
3. Select simulation function on scantool.
4. Simulate voltage at terminal 2 of HO2S (B1/S2) signal connector.
  
  Fig 1: Scantool Display - Simulation Of Voltage At Terminal 2 Of HO2S
5. Does the signal value of HO2S (B1/S2) 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.