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7 CHECK HO2S1 (FRONT) INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 1. Disconnect ECM harness connector. Refer to Wiring Diagram. MTBL0473 Continuity should exist. 3. Check harness continuity between ECM terminal or FRONT HO2S terminal and ground as follows. Refer to Wiring Diagram. MTBL0474 Continuity should not exist. 4. Also check harness for short to power. OK or NG OK © GO TO 8. NG © Repair open circuit or short to ground or short to power in harness or connectors. 8 CHECK HEATED OXYGEN SENSOR 1 HEATER (FRONT) Check resistance between HO2S1 (front) terminals as follows. SEF969Y CAUTION: Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a OK or NG OK © GO TO 9. NG © GO TO 13. GI MA EM LC FE AT TF PD AX SU BR ST RS BT HA SC EL IDX DTC P0133, P0153 HEATED OXYGEN SENSOR 1 (FRONT) (BANK 1)/(BANK 2) (RESPONSE MONITORING) Diagnostic Procedure (Cont’d) EC-227 |