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EC9-242 < DTC/CIRCUIT DIAGNOSIS > [R9M] P0471 EXHAUST PRESSURE SENSOR P0471 EXHAUST PRESSURE SENSOR DTC Logic INFOID:0000000010309175 DTC DETECTION LOGIC NOTE: DTC CONFIRMATION PROCEDURE 1. PERFORM DIAGNOSIS PROCEDURE NOTE: >> Proceed to EC9-242, "Diagnosis Procedure" . Diagnosis Procedure INFOID:0000000010502768 1. CHECK ECM HARNESS CONNECTOR CONNECTIONS 1. Turn ignition switch OFF. 2. Check ECM harness connector connection. Is the inspection result normal? YES >> GO TO 2. NO >> Repair or replace error-detected parts. 2. CHECK EXHAUST GAS PRESSURE SENSOR HARNESS CONNECTOR CONNECTIONS Check exhaust gas pressure sensor harness connector connection. Is the inspection result normal? YES >> GO TO 3. NO >> Repair or replace error-detected parts. 3. CHECK EXHAUST GAS PRESSURE SENSOR POWER SUPPLY CIRCUIT Check the power supply of the exhaust gas pressure sensor. Is the inspection result normal? YES >> GO TO 4. NO >> Perform trouble diagnosis for power supply circuit. 4. CHECK EXHAUST GAS PRESSURE SENSOR CIRCUIT FOR OPEN AND SHORT 1. Turn ignition switch OFF. 2. Check exhaust gas pressure sensor circuit for open and short. DTC No. CONSULT screen terms (Trouble diagnosis content) DTC detecting condition Possible cause P0471 PRS UPSTR OF TBN SOR MOUNTING • 2.DEF: SIGNAL INCOHER- ENCE • Difference between barometric pressure and exhaust pressure while engine • Exhaust pressure is excessively low while engine is running. Exhaust gas pressure sensor + - Voltage (Approx.) Exhaust gas pressure sensor Connector Terminal F135 3 Ground 5 V |