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P0078 EVT CONTROL SOLENOID VALVE EC-175 < DTC/CIRCUIT DIAGNOSIS > [HR16DE] C D E F G H I J K L M A EC N P O P0078 EVT CONTROL SOLENOID VALVE DTC Logic INFOID:0000000009267074 DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE 1. PRECONDITIONING If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test. 1. Turn ignition switch OFF and wait at least 10 seconds. 2. Turn ignition switch ON. 3. Turn ignition switch OFF and wait at least 10 seconds. >> GO TO2. 2. PERFORM DTC CONFIRMATION PROCEDURE 1. Start engine and let it idle for 5 seconds. 2. Check 1st trip DTC. YES >> Proceed to . NO >> INSPECTION END Diagnosis Procedure INFOID:0000000009267075 1. CHECK EXHAUST VALVE TIMING CONTROL SOLENOID VALVE POWER SUPPLY 1. Turn ignition switch OFF. 2. Disconnect exhaust valve timing (EVT) control solenoid valve harness connector. 3. Turn ignition switch ON. 4. Check the voltage between exhaust valve timing control solenoid valve harness connector and ground. Is the inspection result normal? YES >> GO TO 3. NO >> GO TO 2. 2. CHECK EXHAUST VALVE TIMING CONTROL SOLENOID VALVE POWER SUPPLY CIRCUIT 1. Turn ignition switch OFF. 2. Disconnect IPDM E/R harness connector. 3. Check the continuity between EVT control solenoid valve harness connector and IPDM E/R harness con- nector. 4. Also check harness for short to ground. DTC No. Trouble diagnosis name (Trouble diagnosis content) DTC detecting condition Possible cause P0078 EX V/T ACT/CIRC-B1 An improper voltage is sent to the • Harness or connectors (Exhaust valve timing control solenoid valve • Exhaust valve timing control solenoid valve EVT control solenoid valve Ground Voltage Connector Terminal F32 2 Ground Battery voltage EVT control solenoid valve IPDM E/R Continuity Connector Terminal Connector Terminal F32 2 F42 39 Existed |