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P0037, P0038 HO2S2 HEATER EC-159 < DTC/CIRCUIT DIAGNOSIS > [QR25DE] C D E F G H I J K L M A EC N P O Diagnosis Procedure INFOID:0000000009480794 1. CHECK GROUND CONNECTIONS 1. Turn ignition switch OFF. 2. Loosen and retighten two ground screws on the body. Refer to . OK or NG OK >> GO TO 2. NG >> Repair or replace ground connections. 2. CHECK HO2S2 POWER SUPPLY CIRCUIT 1. Disconnect heated oxygen sensor 2 harness connector. 2. Turn ignition switch ON. 3. Check voltage between HO2S2 terminal 3 and ground with CONSULT or tester. OK or NG OK >> GO TO 4. NG >> GO TO 3. 3. DETECT MALFUNCTIONING PART Check the following. • Harness connectors E2, F32 • IPDM E/R connector E119 • 15A fuse (No.54) • Harness for open or short between heated oxygen sensor 2 and fuse >> Repair open circuit, short to ground or short to power in harness or connectors. 4. CHECK HO2S2 OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check harness continuity between ECM terminal 13 and HO2S2 terminal 2. Refer to Wiring Diagram. BBIA0614E BBIA0613E Voltage: Battery voltage PBIB0112E |