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EC-146 < COMPONENT DIAGNOSIS > [VQ35HR] P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATER 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. 3. Check the voltage between A/F sensor 1 harness connector and ground. Is the inspection result normal? YES >> GO TO 4. NO >> GO TO 3. 3. DETECT MALFUNCTIONING PART Check the following. >> 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 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 5. NO >> Repair open circuit or short to ground or short to power in harness or connectors. 5. CHECK A/F SENSOR 1 HEATER EC-147, "Component Inspection" Is the inspection result normal? YES >> GO TO 7. NO >> GO TO 6. 6. REPLACE AIR FUEL RATIO (A/F) SENSOR 1 Replace malfunctioning air fuel ratio (A/F) sensor 1. 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 using Oxygen Sensor Thread Cleaner [commercial service tool (J-43897-18 or J-43897-12)] and approved anti-seize lubricant DTC A/F sensor 1 Ground Voltage Bank Connector Terminal P0031, P0032 1 F3 4 Ground Battery voltage P0051, P0052 2 F20 4 DTC A/F sensor 1 ECM Continuity Bank Connector Terminal Connector Terminal P0031, P0032 1 F3 3 F101 1 Existed P0051, P0052 2 F20 3 5 |