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6 CHECK INPUT SIGNAL CIRCUIT 1. Disconnect heated oxygen sensor 1 (front) harness connector and ECM harness connector. SEF917Z 2. Check harness continuity between ECM terminal 62 and HO2S1 terminal 2. Refer to Wiring Diagram. Continuity should exist. 3. Check harness continuity between ECM terminal 62 (or HO2S1 terminal 2) and ground. Refer to Wiring Diagram. 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. 7 CHECK HEATED OXYGEN SENSOR 1 HEATER (FRONT) Refer to “Component Inspection”, EC-236. OK or NG OK © GO TO 8. NG © Replace heated oxygen sensor 1 (front). 8 CHECK HEATED OXYGEN SENSOR 1 (FRONT) Refer to “Component Inspection”, EC-224. OK or NG OK © GO TO 9. NG © Replace heated oxygen sensor 1 (front). 9 CHECK MASS AIR FLOW SENSOR Refer to “Component Inspection”, EC-162. OK or NG OK © GO TO 10. NG © Replace mass air flow sensor. 10 CHECK PCV VALVE Refer to “Positive Crankcase Ventilation”, EC-49. OK or NG OK © GO TO 11. NG © Repair or replace PCV valve. GI MA EM LC FE CL MT AT AX SU BR ST RS BT HA SC EL IDX DTC P0133 HEATED OXYGEN SENSOR 1 (FRONT) (RESPONSE MONITORING) Diagnostic Procedure (Cont’d) EC-223 |