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EC-1162 < COMPONENT DIAGNOSIS > [K9K] P0488 EGR SYSTEM P0488 EGR SYSTEM DTC Logic INFOID:0000000001162628 DTC DETECTION LOGIC NOTE: The DTC is declared present after the engine is started. • Special notes: Diagnosis Procedure INFOID:0000000001162629 1. CHECK GROUND CONNECTIONS 1. Turn ignition switch OFF. 2. Check ground connection E15. Refer to Ground inspection in . Is the inspection result normal? YES >> GO TO 2. NO >> Repair or replace ground connection. 2. CHECK EGR VOLUME CONTROL VALVE INSTALLATION Check that EGR volume control valve is installed properly. YES >> GO TO 3. NO >> Install EGR volume control valve properly. 3. CHECK EGR VOLUME CONTROL VALVE CONTROL POSITION SENSOR POWER SUPPLY CIRCUIT 1. Disconnect EGR volume control valve harness connector. 2. Turn ignition switch ON. 3. Check the voltage between EGR volume control valve control position sensor connector and ground. Is the inspection result normal? YES >> GO TO 4. NO >> Repair open circuit or short to ground or short to power in harness or connectors. 4. CHECK EGR VOLUME CONTROL VALVE CONTROL POSITION SENSOR GROUND CIRCUIT FOR DTC No. Trouble diagnosis name Possible cause P0488 EGR VOLUME CONTROL • Harness or connectors (The EGR volume control valve circuit is open • EGR volume control valve sensor • Incorrect EGR volume control valve installa- tion • EGR volume control valve stuck closed GR volume control valve control position sensor Ground Voltage Connector Terminal F52 1 Ground Approx. 5V |