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EC-164 < COMPONENT DIAGNOSIS > [VK56DE] P0138, P0158 HO2S2 OK or NG OK >> GO TO 2. NG >> Repair or replace ground connections. 2. CLEAR THE SELF-LEARNING DATA With CONSULT-III 1. Start engine and warm it up to normal operating temperature. 2. Select “SELF-LEARNING CONT” in “WORK SUPPORT” mode with CONSULT-III. 3. Clear the self-learning control coefficient by touching “CLEAR”. 4. Run engine for at least 10 minutes at idle speed. Is the 1st trip DTC P0172 or P0175 detected? Is it difficult to start engine? Without CONSULT-III 1. Start engine and warm it up to normal operating temperature. 2. Turn ignition switch OFF. 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 7. Make sure DTC P0000 is displayed. 8. Run engine for at least 10 minutes at idle speed. Is the 1st trip DTC P0172 or P0175 detected? Is it difficult to start engine? Yes or No Yes >> Perform trouble diagnosis for DTC P0172, P0175. 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 ECM terminal 78 and HO2S2 terminal 4. Refer to Wiring Diagram. BBIA0354E BBIA0368E BBIA0435E |