Component Inspection: Notes

Visual Check
1. Turn the ignition switch "OFF" & Disconnect HO2S (S1) connector.
2. Check that HO2S (S1) is contaminated or damaged by foreign materials.
3. Has a problem been found?
  YES
  - Go to next step as below
  NO
  - Replace the HO2S (S1) with an usable one and check for proper operation. If the problem is corrected, replace the HO2S (S1) and then go to "VERIFICATION OF VEHICLE REPAIR ".
Check HO2S (S1) performance
1. Turn the ignition switch "OFF".
2. Connect probe to signal terminal of HO2S (S1) connector and select oscilloscope function with GDS.
3. Warm up the engine to normal operating temperature.
4. Measure signal waveform of HO2S (S1) with GDS.
  Specification: Refer to SIGNAL WAVEFORM & Data .
5. Is the measured signal waveform within specification?
  YES
  - Fault is intermittent caused by poor contact in the sensor's and/or ECM's connector. Or, ECM memory was not cleared after repair. Thoroughly check connectors for looseness, poor connection, ending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "VERIFICATION OF VEHICLE REPAIR ".
  NO
  - Replace the HO2S (S1) with an usable one and check for proper operation. If the problem is corrected, replace the HO2S (S1) and then go to "VERIFICATION OF VEHICLE REPAIR ".