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DTC P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATER EC-181 C D E F G H I J K L M A EC 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. 3. Check voltage between A/F sensor 1 terminal 3 and ground with OK or NG OK >> GO TO 4. NG >> GO TO 3. 3. DETECT MALFUNCTIONING PART Check the following. ● Harness connectors M72, F102 ● Harness connectors E108, M15 ● IPDM E/R harness connector E7 ● 15A fuse ● Harness for open or short between A/F sensor 1 and fuse >> Repair or replace harness or connectors. 4. CHECK A/F SENSOR 1 HEATER OUTPUT SIGNAL CIRCUIT 1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check harness continuity between ECM terminal 2 (bank 1) or 24 (bank 2) and A/F sensor 1 terminal 4. 4. Also check harness for short to ground or short to power. OK or NG OK >> GO TO 5. NG >> Repair open circuit or short to ground or short to power in harness or connectors. Voltage: Battery voltage PBIB2100E PBIB1683E Continuity should exist. |