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4 RETIGHTEN GROUND SCREWS 1. Turn ignition switch “OFF”. SEC377C 3. Disconnect heated oxygen sensor 1 (HO2S1) (front) harness connector. SEC383C © GO TO 5. 5 RETIGHTEN HEATED OXYGEN SENSOR 1 (FRONT) Loosen and retighten corresponding heated oxygen sensor 1 (front). Tightening torque: 40 - 60 N·m (4.1 - 6.1 kg-m, 30 - 44 ft-lb) © GO TO 6. 6 CHECK INPUT SIGNAL CIRCUIT 1. Disconnect ECM harness connector. Refer to wiring diagram. Continuity should exist. 3. Check harness continuity between ECM terminal 19 (or HO2S1 terminal 2) and ground. Continuity should not exist. 4. Also check harness for short to power. OK or NG OK © GO TO 7. NG © Repair open circuit or short to ground or short to power in harness or connectors. GI MA EM LC FE CL MT AT PD AX SU BR ST RS BT HA SC EL IDX HEATED OXYGEN SENSOR 1 (FRONT) Diagnostic Procedure (Cont’d) EC-155 |