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P0031, P0032 A/F SENSOR 1 HEATER ECM-165 < DTC/CIRCUIT DIAGNOSIS > [MR20DD] C D E F G H I J K L M A ECM N P O Is the inspection result normal? YES >> GO TO 2. NO >> Repair or replace malfunctioning part. 2. CHECK A/F SENSOR 1 HEATER OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check the continuity between A/F sensor 1 harness connector and ECM harness connector. 4. Also check harness for short to ground and short to power. Is the inspection result normal? YES >> GO TO 3. NO >> Repair or replace malfunctioning part. 3. CHECK A/F SENSOR 1 HEATER ECM-165, "Component Inspection" Is the inspection result normal? YES >> INSPECTION END NO >> GO TO 4. 4. REPLACE A/F SENSOR 1 Replace malfunctioning A/F sensor 1. Refer to . CAUTION: • Discard any A/F sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard surface such as a concrete floor; use a new one. • Before installing new A/F sensor, clean exhaust system threads. >> INSPECTION END Component Inspection INFOID:0000000010702893 1. CHECK AIR FUEL RATIO (A/F) SENSOR 1 HEATER 1. Turn ignition switch OFF. 2. Disconnect air fuel ratio (A/F) sensor 1 harness connector. 3. Check resistance between A/F sensor 1 terminals as per the following. Is the inspection result normal? YES >> INSPECTION END NO >> GO TO 2. 2. REPLACE A/F SENSOR 1 + − Continuity A/F sensor 1 ECM Connector Terminal Connector Terminal F74 3 F16 93 Existed A/F sensor 1 Resistance + − Terminal 3 4 1.80 - 2.44 Ω [at 25 ° C (77 ° F)] 1 Not exist 2 4 1 2 |