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FLA -246 FUEL SYSTEM SIGNAL CIRCUIT INSPECTION E702180A 1. IG "OFF" and disconnect HO2S(B1/S1) connector. 2. IG "ON" and ENG "OFF" 3. Measure voltage between terminal 1 of HO2S(B1/S1) harness connector and chassis ground. Specification : Approx. 3.5V - when pumping current is ON 4. Is the measured voltage within specification? YES ▶ Go to "Component Inspection" procedure. NO ▶ Repair short to battery in harness, and go to "Verification of Vehicle Repair" procedure. COMPONENT INSPECTION EBFB56A3 1. Check the Signal waveform of HO2S 1) IG "OFF" and connect HO2S connector. 2) Engine start. 3) After warming-up, monitor signal waveform of HO2S with scantool.? Fig) Signal waveform of front(the upper) and rear(the lower) HO2S at idle SCMF16225L 4) Is the sensor switching properly? YES ▶ Go to "Check HO2S" as below. NO |