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EC-388 < DTC/CIRCUIT DIAGNOSIS > [QR25DE] P1078 EVT CONTROL POSITION SENSOR P1078 EVT CONTROL POSITION SENSOR DTC Description INFOID:0000000011278104 DTC DETECTION LOGIC POSSIBLE CAUSE • Harness or connectors (Exhaust valve timing control position sensor circuit is open or shorted.) • Accumulation of debris to the signal pick-up portion of the camshaft • Exhaust valve timing control position sensor • Sensor power supply 2 circuit FAIL-SAFE • Traveling control mode (Accelerator angle variation control) • Device fix mode 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 TO 2. 2. PERFORM DTC CONFIRMATION PROCEDURE 1. Start engine and let it idle for 10 seconds. 2. Check 1st trip DTC. YES >> Proceed to . NO >> INSPECTION END Diagnosis Procedure INFOID:0000000011278105 1. CHECK EXHAUST VALVE TIMING (EVT) CONTROL POSITION SENSOR POWER SUPPLY 1. Turn ignition switch OFF. 2. Disconnect exhaust valve timing (EVT) control position sensor harness connector. 3. Turn ignition switch ON. 4. Check the voltage between EVT control position sensor harness connector and ground. Is the inspection result normal? YES >> GO TO 3. NO >> GO TO 2. 2. CHECK SENSOR POWER SUPPLY 2 CIRCUIT Perform . DTC No. CONSULT screen terms (Trouble diagnosis content) DTC detecting condition P1078 EXH TIM SEN/CIRC-B1 An excessively high or low voltage from the sensor is sent to ECM. + − Voltage (Approx.) EVT control position sensor Connector Terminal F45 1 Ground 5 V |