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3 CHECK INPUT SIGNAL CIRCUIT 1. Disconnect heated oxygen sensor 2 (rear) harness connector and ECM harness connector. SEF209X 2. Check harness continuity between ECM terminal 63 and rear heated oxygen harness connector terminal 2. Refer to wiring diagram. Continuity should exist. 3. Check harness continuity between ECM terminal 63 (or terminal 2) and ground. Continuity should not exist. 4. Also check harness for short to ground and short to power. OK or NG OK © GO TO 5. NG © GO TO 4. 4 DETECT MALFUNCTIONING PART Check the harness for open or short between heated oxygen sensor 2 (rear) and ECM. © Repair open circuit or short to ground or short to power in harness or connectors. 5 CHECK GROUND CIRCUIT 1. Check harness continuity between heated oxygen sensor 2 (rear) harness connector terminal 1 and engine ground. Refer to wiring diagram. Continuity should exist. 2. Also check harness for short to ground and short to power. OK or NG OK © GO TO 6. NG © Repair open circuit or short to ground or short to power in harness or connectors. 6 CHECK HEATED OXYGEN SENSOR 2 (REAR) Refer to “Component Inspection”, EC-SR-200. 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-SR-114. © INSPECTION END Heated oxygen sensor 2 Heated oxygen Front exhaust tube DTC P0139 HEATED OXYGEN SENSOR 2 (REAR) (RESPONSE MONITORING) SR20DE Diagnostic Procedure (Cont’d) EC-199 |