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EC-138 < DTC/CIRCUIT DIAGNOSIS > [MR18DE] P0031, P0032 A/F SENSOR 1 HEATER P0031, P0032 A/F SENSOR 1 HEATER Description INFOID:0000000009947252 SYSTEM DESCRIPTION The ECM performs ON/OFF duty control of the A/F sensor 1 heater corresponding to the engine operating DTC Logic INFOID:0000000009947253 DTC DETECTION LOGIC 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 >> Go to NO >> INSPECTION END Diagnosis Procedure INFOID:0000000009947254 1. CHECK GROUND CONNECTION 1. Turn ignition switch OFF. 2. Check ground connection E38. Refer to Ground Inspection in . Is the inspection result normal? YES >> GO TO 2. NO >> Repair or replace ground connection. 2. CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT 1. Disconnect air fuel ratio (A/F) sensor 1 harness connector. 2. Turn ignition switch ON. Sensor Input signal to ECM ECM function Actuator Camshaft position sensor (PHASE) Engine speed Air fuel ratio (A/F) sensor 1 Air fuel ratio (A/F) sensor 1 Mass air flow sensor Amount of intake air DTC No. Trouble diagnosis name DTC detecting condition Possible cause P0031 Air fuel ratio (A/F) sensor 1 The current amperage in the A/F sensor 1 heater • Harness or connectors (The A/F sensor 1 heater circuit is • A/F sensor 1 heater P0032 Air fuel ratio (A/F) sensor 1 The current amperage in the A/F sensor 1 heater • Harness or connectors (The A/F sensor 1 heater circuit is • A/F sensor 1 heater |