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P0031, P0032 A/F SENSOR 1 HEATER EC-181 < DTC/CIRCUIT DIAGNOSIS > [MR20DD] C D E F G H I J K L M A EC N P O P0031, P0032 A/F SENSOR 1 HEATER DTC Description INFOID:0000000010775110 DTC DETECTION LOGIC POSSIBLE CAUSE P0031 • Harness or connectors (The A/F sensor 1 heater circuit is open or shorted.) P0032 • Harness or connectors (The A/F sensor 1 heater circuit is shorted.) FAIL-SAFE Not applicable DTC CONFIRMATION PROCEDURE 1. PRECONDITIONING If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at >> GO TO 2. 2. PERFORM DTC CONFIRMATION PROCEDURE 1. Start engine and let it idle for at least 10 seconds. 2. Check 1st trip DTC. Is 1st trip DTC detected? YES >> Proceed to . NO-1 >> To check malfunction symptom before repair: Refer to GI-44, "Intermittent Incident" NO-2 >> Confirmation after repair: INSPECTION END Diagnosis Procedure INFOID:0000000010775111 1. CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT 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. DTC No. CONSULT screen terms (Trouble diagnosis content) DTC detecting condition P0031 A/F SEN1 HTR (B1) An excessively low voltage signal is sent to ECM through the A/F sensor 1 P0032 A/F SEN1 HTR (B1) An excessively high voltage signal is sent to ECM through the A/F sensor + Ground Voltage A/F sensor 1 Connector Terminal F27 4 Ground Battery voltage |