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P0139 HO2S2 ECM-221 < DTC/CIRCUIT DIAGNOSIS > [MR20DD] C D E F G H I J K L M A ECM N P O >> GO TO 5. 11. PERFORM COMPONENT FUNCTION CHECK-1 Without CONSULT 1. Start engine and warm it up to normal operating temperature. 2. Turn ignition switch OFF and wait at least 10 seconds. 3. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load. 4. Let engine idle for 1 minute. 5. Check the voltage between ECM harness connector and ground as per the following condition. Is the inspection result normal? YES-1 >> To check malfunction symptom before repair: Refer to GI-41, "Intermittent Incident" YES-2 >> Confirmation after repair: INSPECTION END >> GO TO 12. 12. PERFORM COMPONENT FUNCTION CHECK-2 Check the voltage between ECM harness connector and ground as per the following condition. Is the inspection result normal? YES-1 >> To check malfunction symptom before repair: Refer to GI-41, "Intermittent Incident" YES-2 >> Confirmation after repair: INSPECTION END >> GO TO 13. 13. PERFORM COMPONENT FUNCTION CHECK-3 Check the voltage between ECM harness connector and ground as per the following condition. Is the inspection result normal? YES-1 >> To check malfunction symptom before repair: Refer to GI-41, "Intermittent Incident" YES-2 >> Confirmation after repair: INSPECTION END >> Proceed to ECM-221, "Diagnosis Procedure" . Diagnosis Procedure INFOID:0000000010702934 1. CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE 1. Clear the mixture ratio self-learning value. Refer to . 2. Run engine for at least 10 minutes at idle speed. Is the 1st trip DTC P0171 or P0172 detected? Is it difficult to start engine? ECM Condition Voltage Connector + − Terminal F16 57 59 Revving up to 4,000 rpm under no The voltage should be above 0.77 V ECM Condition Voltage Connector + − Terminal F16 57 59 Keeping engine speed at idle for 10 The voltage should be above 0.77 V ECM Condition Voltage Connector + − Terminal F16 57 59 Coasting from 80 km/h (50 MPH) in The voltage should be above 0.77 V |