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P0078 EVT CONTROL SOLENOID VALVE ECM-173 < DTC/CIRCUIT DIAGNOSIS > [MR20DD] C D E F G H I J K L M A ECM N P O P0078 EVT CONTROL SOLENOID VALVE DTC Description INFOID:0000000010702900 DTC DETECTION LOGIC POSSIBLE CAUSE • Harness or connectors FAIL-SAFE DTC CONFIRMATION PROCEDURE 1. PRECONDITIONING If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at >> GO TO 2. 2. PERFORM DTC CONFIRMATION PROCEDURE 1. Start engine and let it idle for at least 5 seconds. 2. Check 1st trip DTC. Is 1st trip DTC detected? YES >> Proceed to ECM-173, "Diagnosis Procedure" . NO-1 >> To check malfunction symptom before repair: Refer to GI-41, "Intermittent Incident" NO-2 >> Confirmation after repair: INSPECTION END Diagnosis Procedure INFOID:0000000010702901 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 EVT control solenoid valve harness connector and ground. Is the inspection result normal? DTC No. CONSULT screen terms (Trouble diagnosis content) DTC detecting condition P0078 EX V/T ACT/CIRC-B1 An improper voltage is sent to the ECM through exhaust valve timing con- Engine operating condition in fail-safe mode Fail safe mode Vehicle behavior Device fix mode • This mode fixes the IVT control solenoid valve and the EVT control solenoid valve in the refer- ence position. • The intake manifold runner control valve motor is turned OFF (intake manifold runner control valve opens). + Ground Voltage EVT control solenoid valve Connector Terminal F78 1 Ground Battery voltage |