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EC-150 < DTC/CIRCUIT DIAGNOSIS > [VK56DE] P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATER OK or NG OK >> GO TO 2. NG >> Repair or replace ground connections. 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 4 and ground with CONSULT-III or tester. OK or NG OK >> GO TO 4. NG >> GO TO 3. 3. DETECT MALFUNCTIONING PART Check the following. • Harness connectors E5, F14 • IPDM E/R harness connector E119 • 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, 43 (bank 2) and A/F sensor 1 terminal 3. Refer to Wiring Diagram. 4. Also check harness for short to ground and short to power. BBIA0354E Voltage: Battery voltage BBIA0376E PBIB3308E Continuity should exist. |