Abstract: A malfunction of an on-board diagnostic (OBD) controller system is diagnosed by comparing a voltage of an input part of an OBD controller with a voltage of a battery. The OBD controller is connected to the battery through a communication line in the HEV. When an input voltage measuring circuit or the controller is malfunctioning, the malfunction is diagnosed.

Abstract: A continuously variable valve duration (CVVD) system includes a controller configured to determine whether a learning value existing in the CVVD system is required to be verified during one of a hardware abnormality, a learning value abnormality, and a motor voltage abnormality. In particular, the controller performs a learning value verification control using a rotation detection value and switches from a learning value verification control to a re-learning control when re-learning is required.

Abstract: An EHC line leakage diagnosis method can operate a heater of an oxygen detector when satisfying one or more conditions of an engine off time, a coolant temperature, and an outside air temperature by a diagnosis controller upon the key-on of the non-operation of an engine, and then, determine the normality or abnormality of a temperature drop using a change in a temperature value of a signal value and the temperature value detected by the oxygen detector after an air pump is driven, and then confirm the leakage of an exhaust line and a line on the rear end portion of an EHC valve of an air line using the number of times of the occurrence of the abnormality of the temperature drop, and can perform the failure diagnosis without generating the exhaust gas by not operating an engine.

Abstract: An EHC line leakage diagnosis method can operate a heater of an oxygen detector when satisfying one or more conditions of an engine off time, a coolant temperature, and an outside air temperature by a diagnosis controller upon the key-on of the non-operation of an engine, and then, determine the normality or abnormality of a temperature drop using a change in a temperature value of a signal value and the temperature value detected by the oxygen detector after an air pump is driven, and then confirm the leakage of an exhaust line and a line on the rear end portion of an EHC valve of an air line using the number of times of the occurrence of the abnormality of the temperature drop, and can perform the failure diagnosis without generating the exhaust gas by not operating an engine.

Abstract: A vehicle and a method of displaying nitrogen oxide emissions of the vehicle to accurately detect and easily display an amount of nitrogen oxide emitted from the vehicle includes receiving nitrogen oxide concentration values of exhaust gas in the vehicle, calculating an average value of the nitrogen oxide concentration based on the nitrogen oxide concentration values, calculating an amount of nitrogen oxide in the exhaust gas based on the average value of the nitrogen oxide concentration, calculating a nitrogen oxide index of the exhaust gas based on the amount of the nitrogen oxide, and displaying the calculated nitrogen oxide index for each of a plurality of predetermined sections through a display unit of a cluster of the vehicle.

Abstract: A method for diagnosing failure of a cold start E/M reduction system confirms the change in the torque reserve compared to the torque reserve confirmed for the ignition timing upon cold start by any one of an operation of an electric load device, an operation of an alternator, an operation of a purge valve, an operation of an air conditioner, a shift state of a transmission, and a coolant temperature state of an engine, and confirms the failure or normality of any one of the electric load device, the alternator, the purge valve, and the air conditioner is normal or failed using the change in the torque reserve to apply the confirmed result to determine whether the cold start E/M reduction system is abnormal, securing failure diagnosis accuracy for the components for the cold start E/M reduction.

Abstract: An embodiment system for mild hybrid starter and generator (MHSG) failure diagnosis of a mild hybrid vehicle includes a data detection part configured to detect data for determining whether to activate a catalyst, and a controller configured to determine whether there is an MHSG failure using a deviation between a required torque and an actual operating torque of an MHSG after determining whether catalyst activation is needed and whether to start a stage of the MHSG failure diagnosis based on the data detected by the data detection part.

Abstract: An apparatus and method for diagnosing a failure in a blower of a vehicle improve performance of various systems using state information of the blower. The apparatus and method include a controller that converts an operating current value supplied to the blower of the vehicle into a voltage value and diagnoses whether the blower fails based on the voltage value. The apparatus and method also include a display that displays whether the blower fails.

Abstract: A continuously variable valve duration (CVVD) system includes a controller configured to determine whether a learning value existing in the CVVD system is required to be verified during one of a hardware abnormality, a learning value abnormality, and a motor voltage abnormality. In particular, the controller performs a learning value verification control using a rotation detection value and switches from a learning value verification control to a re-learning control when re-learning is required.

Abstract: A method for verifying a CVVD location learning result may include performing a learning value verification control by confirming a position of a control shaft connected to a motor with a signal value of an auxiliary cam sensor for a rotation of a camshaft if a controller determines that a learning value acquired in a short duration and a long duration of a CVVD system is desired to be verified.

Abstract: A device and a method for diagnosing a positive crankcase ventilation (PCV) breather line. The device includes: a crankcase pressure sensor that is installed on the PCV breather line including a front end connected to an intake line and a rear end connected to a crankcase and detects a pressure inside the crankcase; and a processor that diagnoses an abnormality of the PCV breather line based on the pressure of the crankcase.

Abstract: A cold start split injection control method is provided. The method includes a split injection controller which determines cold start conditions of an engine system, an injection mode control which performs a cold start split injection by an operation of an injector and an injection malfunction diagnostic control which performs an injection malfunction diagnostic with any one or more among an injector opening angle, an injector operating time, and the number of injector operation times which are measured through the fuel injection of the injector.

Abstract: A method for diagnosing failure of a cold start E/M reduction system confirms the change in the torque reserve compared to the torque reserve confirmed for the ignition timing upon cold start by any one of an operation of an electric load device, an operation of an alternator, an operation of a purge valve, an operation of an air conditioner, a shift state of a transmission, and a coolant temperature state of an engine, and confirms the failure or normality of any one of the electric load device, the alternator, the purge valve, and the air conditioner is normal or failed using the change in the torque reserve to apply the confirmed result to determine whether the cold start E/M reduction system is abnormal, securing failure diagnosis accuracy for the components for the cold start E/M reduction.

Abstract: A vehicle may include a cluster and an engine control unit (ECU), where the cluster may generate a travel distance signal that indicates a travel distance detected by a vehicle speed sensor, and the ECU may be configured to set a travel distance at the time of an immediately previous key-OFF as a current travel distance when the travel distance signal indicates the initial value at the time of an ignition-ON, and to set the temporary previous travel distance and the temporary current travel distance as a previous travel distance and the current travel distance, respectively, when a temporary previous travel distance prior to a current time point by a predetermined period and a temporary current travel distance at the current time point are greater than or equal to the set current travel distance.

Abstract: A thermostat misdiagnosis prevention method applied to an engine system of the present disclosure applies high speed/high load and low speed/low load, which are divided by a vehicle speed and an engine output detected from the engine system at an engine warm-up temperature of engine coolant, as monitoring conditions of a thermostat, and determines thermostat fail by primarily determining the thermostat fail with the engine coolant temperature of the engine coolant temperature and the outside air temperature detected from the engine system, then confirming a delay time with respect to the outside air temperature, and secondarily determining the thermostat fail with the engine coolant temperature in a monitoring ECU, thereby corresponding to the enhanced OBD together with preventing the misdiagnosis of the thermostat by the fail-safe according to the primary and secondary determinations.

Abstract: A cold start split injection control method is provided. The method includes a split injection controller which determines cold start conditions of an engine system, an injection mode control which performs a cold start split injection by an operation of an injector and an injection malfunction diagnostic control which performs an injection malfunction diagnostic with any one or more among an injector opening angle, an injector operating time, and the number of injector operation times which are measured through the fuel injection of the injector.

Abstract: A device and a method for diagnosing a positive crankcase ventilation (PCV) breather line. The device includes: a crankcase pressure sensor that is installed on the PCV breather line including a front end connected to an intake line and a rear end connected to a crankcase and detects a pressure inside the crankcase; and a processor that diagnoses an abnormality of the PCV breather line based on the pressure of the crankcase.

Abstract: An apparatus and method for diagnosing a failure in a blower of a vehicle improve performance of various systems using state information of the blower. The apparatus and method include a controller that converts an operating current value supplied to the blower of the vehicle into a voltage value and diagnoses whether the blower fails based on the voltage value. The apparatus and method also include a display that displays whether the blower fails.

Abstract: A method of diagnosing an engine purge system includes: obtaining, by a controller, a first measurement value by measuring a pressure of a secondary purge line when a boosting pressure from a compressor is greater than or equal to a predetermined reference pressure; obtaining, by the controller, a second measurement value by measuring a pressure of the secondary purge line while opening and closing a purge control solenoid valve when a throttle valve is deployed; determining, by the controller, whether at least one of the secondary purge line or a recirculation line is blocked by comparing the first measurement value and the second measurement value; and providing, by the controller, an alert when it is determined that at least one of the secondary purge line or the recirculation line is blocked.

Abstract: A method of diagnosing an engine purge system includes: obtaining, by a controller, a first measurement value by measuring a pressure of a secondary purge line when a boosting pressure from a compressor is greater than or equal to a predetermined reference pressure; obtaining, by the controller, a second measurement value by measuring a pressure of the secondary purge line while opening and closing a purge control solenoid valve when a throttle valve is deployed; determining, by the controller, whether at least one of the secondary purge line or a recirculation line is blocked by comparing the first measurement value and the second measurement value; and providing, by the controller, an alert when it is determined that at least one of the secondary purge line or the recirculation line is blocked.