Connect Scantool then Engine "ON"

Warm up the engine to normal operating temperature.

Monitor the signal waveform of HO2S(B1S2) with scantool

Specification : 0.1 ~ 0.9V

Is the shift time from signal waveform within specifications ?

YES

▶ Fault is intermittent caused by poor contact in the sensor’s and/or PCM’s connector or was repaired and PCM memory was not cleared. 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

▶ Go to "Terminal and connector inspection" procedure