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P0131 A/F SENSOR 1 ECM-201 < DTC/CIRCUIT DIAGNOSIS > [MR20DD] C D E F G H I J K L M A ECM N P O YES >> Proceed to ECM-201, "Diagnosis Procedure" . NO-1 >> To check malfunction symptom before repair: Refer to GI-41, "Intermittent Incident" NO-2 >> Confirmation after repair: INSPECTION END 4. PERFORM COMPONENT FUNCTION CHECK WITHOUT CONSULT NOTE: Start engine and warm it up to normal operating temperature. 2. Shift the lever to suitable position and drive for a few minutes at 80 km/h (50 MPH). CAUTION: Always drive vehicle at a safe speed. 3. Release the accelerator pedal fully until the vehicle speed decreases to 50 km/h (31 MPH). 4. Repeat steps 2 and 3, 5 times. 5. Stop the vehicle, turn ignition switch OFF and wait at least 10 seconds. 6. Restart engine. 7. Repeat steps 2 and 3, 5 times. 8. Stop the vehicle and Check 1st trip DTC. Is 1st trip DTC detected? YES >> Proceed to ECM-198, "Diagnosis Procedure" NO-1 >> To check malfunction symptom before repair: Refer to GI-41, "Intermittent Incident" NO-2 >> Confirmation after repair: INSPECTION END Diagnosis Procedure INFOID:0000000010702924 1. CHECK AIR FUEL RATIO SENSOR 1 POWER SUPPLY 1. Turn ignition switch OFF. 2. Disconnect air fuel ratio (A/F) sensor 1 harness connector. 3. Turn ignition switch ON. 4. Check the voltage between A/F sensor 1 harness connector and ground. Is the inspection result normal? YES >> GO TO 3. NO >> GO TO 2. 2. CHECK AIR FUEL RATIO SENSOR 1 POWER SUPPLY CIRCUIT 1. Turn ignition switch OFF. 2. Disconnect IPDM E/R harness connector. 3. Check the continuity between A/F sensor 1 harness connector and IPDM E/R harness connector. 4. Also check harness for short to ground and short to power. Is the inspection result normal? YES >> Perform trouble diagnosis for power supply circuit. NO >> Repair or replace malfunctioning part. + Ground Voltage A/F sensor 1 Connector Terminal F74 4 Ground Battery voltage + − Continuity A/F sensor 1 IPDM E/R Connector Terminal Connector Terminal F74 4 F90 105 Existed |