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P0133 A/F SENSOR 1 EC-737 < COMPONENT DIAGNOSIS > [QR25DE EXCEPT FOR CALIFORNIA] C D E F G H I J K L M A EC N P O 2. Turn ignition switch ON. 3. Check the voltage between A/F sensor 1 harness connector and ground. Is the inspection result normal? YES >> GO TO 8. NO >> GO TO 7. 7. DETECT MALFUNCTIONING PART Check the following. • IPDM E/R harness connector F10 • 15A fuse (No. 37) • Harness for open or short between A/F sensor 1 and fuse >> Repair or replace harness or connectors. 8. CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Check the continuity between A/F sensor 1 harness connector and ECM harness connector. 4. Check the continuity between A/F sensor 1 harness connector or ECM harness connector and ground. 5. Also check harness for short to power. YES >> GO TO 9. NO >> Repair open circuit or short to ground or short to power in harness or connectors. 9. CHECK AIR FUEL RATIO (A/F) SENSOR 1 HEATER EC-686, "Component Inspection" Is the inspection result normal? YES >> GO TO 10. NO >> GO TO 13. 10. CHECK MASS AIR FLOW SENSOR Check mass air flow sensor. EC-696, "Component Inspection" Is the inspection result normal? YES >> GO TO 11. NO >> Replace mass air flow sensor. 11. CHECK PCV VALVE A/F sensor 1 Ground Voltage Connector Terminal F44 4 Ground Battery voltage PBIB3308E A/F sensor 1 ECM Continuity Connector Terminal Connector Terminal F44 1 F13 45 Existed 2 49 A/F sensor 1 ECM Ground Continuity Connector Terminal Connector Terminal F44 1 F13 45 Ground Not existed 2 49 |