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3 DETECT MALFUNCTIONING PART Check the following. + Harness connectors F38, M50 (where fitted) + Harness connectors M72, F44 (where fitted) + 10A fuse + Harness for open or short between heated oxygen sensor 1 (front) and fuse © Repair harness or connectors. 4 CHECK OUTPUT SIGNAL CIRCUIT 1. Turn ignition switch “OFF”. Refer to wiring diagram. Continuity should exist. 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. 5 CHECK HEATED OXYGEN SENSOR 1 HEATER (FRONT) Refer to “Component Inspection”, EC-425. OK or NG OK © GO TO 6. NG © Replace heated oxygen sensor 1 (front). 6 CHECK INTERMITTENT INCIDENT Perform “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-145. © INSPECTION END SEF935X Component Inspection NLEC1230 HEATED OXYGEN SENSOR 1 HEATER (FRONT) NLEC1230S01 Check resistance between terminals 3 and 1. Resistance: 2.3 - 4.3 Ω at 25°C (77°F) Check continuity between terminals 2 and 1, 3 and 2. Continuity should not exist. If NG, replace the heated oxygen sensor 1 (front). CAUTION: + Discard any heated oxygen sensor which has been + Before installing new oxygen sensor, clean exhaust sys- HEATED OXYGEN SENSOR 1 HEATER (FRONT) QG18DE Diagnostic Procedure (Cont’d) EC-425 |