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4 CHECK GROUND CIRCUIT 1. Check harness continuity between heated oxygen sensor 2 (rear) harness connector terminal 3 and engine ground. Refer to wiring diagram. Continuity should exist. 2. Also check harness for short to power. OK or NG OK © GO TO 5. NG © Repair open circuit or short to power in harness or connectors. 5 CHECK HARNESS CONNECTOR Check heated oxygen sensor 2 (rear) harness connector for water. Water should not exist. OK or NG OK © GO TO 6. NG © Repair or replace harness connector. 6 CHECK HEATED OXYGEN SENSOR 2 (REAR) Refer to “Component Inspection”, EC-QG-201. OK or NG OK © GO TO 7. NG © Replace heated oxygen sensor 2 (rear). 7 CHECK INTERMITTENT INCIDENT Perform “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-QG-102. © INSPECTION END Component Inspection NLEC0179 HEATED OXYGEN SENSOR 2 (REAR) NLEC0179S01 With CONSULT-II 1) Start engine and drive vehicle at a speed of more than 70 km/h 2) Stop vehicle with engine running. 3) Select “FUEL INJECTION” in “ACTIVE TEST” mode, and 4) Check “HO2S2 (B1)” at idle speed when adjusting “FUEL CAUTION: I Discard any heated oxygen sensor which has been I Before installing new oxygen sensor, clean exhaust sys- SEF662Y DTC P0140 HEATED OXYGEN SENSOR 2 (REAR) (HIGH VOLTAGE) QG16 I 18DE Diagnostic Procedure (Cont’d) EC-201 |