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P0138 HO2S2 EC-215 < DTC/CIRCUIT DIAGNOSIS > [QR25DE] C D E F G H I J K L M A EC N P O 3. Disconnect mass air flow sensor harness connector, and restart and run engine for at least 5 seconds at idle speed. 4. Stop engine and reconnect mass air flow sensor harness con- nector. 5. Make sure DTC P0102 is displayed. 6. Erase the DTC memory. Refer to (With CONSULT). 7. Make sure DTC P0000 is displayed. 8. Run engine for at least 10 minutes at idle speed. Is the 1st trip DTC P0172 detected? Is it difficult to start engine? Yes or No Yes >> Perform trouble diagnosis for DTC P0172. Refer to . No >> GO TO 3. 3. CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT 1. Turn ignition switch OFF. 2. Disconnect heated oxygen sensor 2 harness connector. 3. Disconnect ECM harness connector. 4. Check harness continuity between HO2S2 terminal 4 and ECM terminal 35. Refer to Wiring Diagram. 5. Also check harness for short to ground and short to power. OK >> GO TO 4. NG >> Repair open circuit, short to ground or short to power in harness or connectors. 4. CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 1. Check harness continuity between ECM terminal 33 and HO2S2 terminal 1. Refer to Wiring Diagram. 2. Check harness continuity between ECM terminal 33 or HO2S2 terminal 1 and ground. Refer to Wiring Diagram. 3. Also check harness for short to power. OK >> GO TO 5. NG >> Repair open circuit, short to ground or short to power in harness or connectors. 5. CHECK HEATED OXYGEN SENSOR 2 EC-216, "Component Inspection" OK or NG OK >> GO TO 6. NG >> Replace heated oxygen sensor 2. Refer to . 6. CHECK INTERMITTENT INCIDENT GI-42, "Intermittent Incident" . >> INSPECTION END BBIA0622E Continuity should exist. BBIA0613E Continuity should exist. Continuity should not exist. |