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P0139, P0159 HO2S2 EC-691 < DTC/CIRCUIT DIAGNOSIS > [VQ40DE FOR USA AND CANADA] 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. Check DTC P0102 is displayed. 6. Erase the DTC memory. Refer to (With CONSULT). 7. Check DTC P0000 is displayed. 8. Run engine for at least 10 minutes at idle speed. Is the 1st trip DTC P0171, P0172, P0174 or P0175 detected? Is it difficult to start engine? Yes or No Yes >> Perform trouble diagnosis for DTC P0171, P0174 or P0172, P0175. Refer to EC-706, "On Board Diagnosis Logic" 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 1 and ECM terminal 59. Refer to Wiring Diagram. 5. Also check harness for short to ground and short to power. OK >> GO TO 4. NG >> Repair open circuit or 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 and HO2S2 terminal as follows. Refer to Wiring Diagram. BBIA0541E Continuity should exist. BBIA0540E |