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5 CLEAR THE SELF-LEARNING DATA With CONSULT-II 1. Start engine and warm it up to normal operating temperature. SEF652Y 4. Run engine for at least 10 minutes at idle speed. Is the 1st trip DTC P0171 or P0172 detected? Is it difficult to start engine? Without CONSULT-II 1. Start engine and warm it up to normal operating temperature. SEF203X 4. Stop engine and reconnect mass air flow sensor harness connector. INFORMATION”, EC-SR-56. 7. Make sure diagnostic trouble code No. 0000 is displayed in Diagnostic Test Mode II. Is the 1st trip DTC 0171 or 0172 detected? Is it difficult to start engine? Yes or No Yes © Perform trouble diagnosis for DTC P0171, P0172. Refer to EC-SR-212, 218. No © GO TO 6. 6 CHECK INPUT SIGNAL CIRCUIT 1. Disconnect heated oxygen sensor 1 (front) harness connector and ECM harness connector. Continuity should exist. 3. Check harness continuity between ECM terminal 62 (or terminal 2) and ground. Continuity should not exist. 4. Also check harness for short to power. OK or NG OK © GO TO 7. NG © Repair open circuit or short to ground or short to power in harness or connectors. Mass air flow sensor Air cleaner DTC P0133 HEATED OXYGEN SENSOR 1 (FRONT) (RESPONSE MONITORING) SR20DE Diagnostic Procedure (Cont’d) EC-167 |