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EC-826 [QG (WITHOUT EURO-OBD)] HO2S1 HEATER (A/T MODELS) 2. CHECK HO2S1 POWER SUPPLY CIRCUIT 1. Turn ignition switch “OFF”. 2. Disconnect heated oxygen sensor 1 harness connector. 3. Turn ignition switch “ON”. 4. Check voltage between HO2S1 terminal 4 and ground with OK or NG OK >> GO TO 4. NG >> GO TO 3. 3. DETECT MALFUNCTIONING PART Check the following. ● Harness connectors M71, F45 ● Fuse block (J/B) connector M1 ● 10A fuse ● Harness for open or short between heated oxygen sensor 1 and fuse >> Repair open circuit or short to ground or short to power in harness or connectors. 4. CHECK HO2S1 OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 1. Turn ignition switch “OFF”. 2. Disconnect ECM harness connector. 3. Check harness continuity between ECM terminal and HO2S1 terminal as follows. 4. Also check harness for short to ground and 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. MBIB0091E Voltage: Battery voltage PBIB0541E Terminals Bank ECM Sensor 24 1 1 25 1 2 Continuity should exist. |