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P0138 HO2S2 EC-191 < DTC/CIRCUIT DIAGNOSIS > [HR16DE] C D E F G H I J K L M A EC N P O Is the inspection result normal? YES >> INSPECTION END NO >> GO TO 2. 2. PERFORM COMPONENT FUNCTION CHECK-II Check the voltage between ECM harness connector terminals under the following condition. Is the inspection result normal? YES >> INSPECTION END NO >> GO TO 3. 3. PERFORM COMPONENT FUNCTION CHECK-III Check the voltage between ECM harness connector terminals under the following condition. Is the inspection result normal? YES >> INSPECTION END NO >> Proceed to . Diagnosis Procedure INFOID:0000000009022547 1. INSPECTION START Confirm the detected malfunction (A or B). Refer to . Which malfunction is detected? A >> GO TO 2. B >> GO TO 7. 2. CHECK GROUND CONNECTION 1. Turn ignition switch OFF. 2. Check ground connection E15. Refer to Ground Inspection in . Is the inspection result normal? YES >> GO TO 3. NO >> Repair or replace ground connection. 3. CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT 1. Disconnect heated oxygen sensor 2 harness connector. 2. Disconnect ECM harness connector. 3. Check the continuity between HO2S2 harness connector and ECM harness connector. 4. Also check harness for short to ground and short to power. ECM Condition Voltage Connector + – Terminal Terminal F11 50 (HO2S2 signal) 59 Keeping engine at idle for 10 minutes The voltage should be below 0.50 V at ECM Condition Voltage Connector + – Terminal Terminal F11 50 (HO2S2 signal) 59 Coasting from 80 km/h (50 MPH) in D position The voltage should be below 0.50 V at HO2S2 ECM Continuity Connector Terminal Connector Terminal E63 1 F11 59 Existed |