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3 CHECK HO2S2 (REAR) INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 1. Turn ignition switch “OFF”. SEF372Z 3. Disconnect corresponding heated oxygen sensor 2 (rear) harness connector. SEF971Y 4. Disconnect ECM harness connector. Refer to Wiring Diagram. MTBL0523 Continuity should exist. 6. Check harness continuity between ECM terminal or HO2S2 terminal and ground as follows. Refer to Wiring Diagram. MTBL0524 Continuity should not exist. 7. Also check harness for short to power. OK or NG OK © GO TO 4. NG © Repair open circuit or short to ground or short to power in harness or connectors. GI MA EM LC FE AT TF PD AX SU BR ST RS BT HA SC EL IDX DTC P0138, P0158 HEATED OXYGEN SENSOR 2 (REAR) (BANK 1)/(BANK 2) (MAX. VOLTAGE MONITORING) Diagnostic Procedure (Cont’d) EC-263 |