Abstract: A control system includes an auto-stop module, an auto-start module, and a starter module. The auto-stop module stops an engine when a brake pedal position is greater than a threshold position and a transmission is in a drive gear. The auto-start module starts the engine when the brake pedal position is less than a minimum position and the engine stop is initiated. When the engine start is initiated and an engine speed is greater than zero, the starter module engages a pinion gear of a starter with a ring gear of an engine by reciprocally actuating the pinion gear N times between a retracted position and an extended position, wherein N is an integer greater than two.

Abstract: A system for diagnosing a switchable roller finger follower (SRFF) and an oil control valve (OCV) includes a signal monitoring module and a fault detection module. The signal monitoring module receives at least one of an individual cylinder fuel correction (ICFC) signal and an air/fuel ratio imbalance (AFIM) signal when: an engine speed signal is within a predetermined range of speed; an engine load signal is within a predetermined range of load; and a charcoal canister vapor signal is within a predetermined range of flow rate. The fault detection module detects a fault of at least one of a SRFF and an OCV based on an exhaust gas recirculation value and at least one of the ICFC and AFIM signals. The ICFC and AFIM signals are generated based on: an engine position signal; and at least one of an oxygen signal and a wide range air fuel signal.

Abstract: A method and control module includes a manifold absolute pressure comparison module that determines a function of the manifold absolute pressure and an average manifold absolute pressure for a plurality of cylinders and that compares the manifold absolute pressure parameter to a manifold absolute pressure threshold. The control module includes a misfire event module that compares the misfire parameter to a misfire threshold. A hardware remedy module performs a valve actuation hardware remedy in response to comparing the manifold absolute pressure and comparing the misfire parameter.

Abstract: A valve lifter control system includes a valve lifter control module and a forced transition determination module. The valve lifter control module determines a desired lift state of a valve lifter based on at least one of engine speed and engine load. The forced transition determination module initiates a forced transition of the valve lifter from the low-lift state to the high-lift state based on manifold vacuum independently of the desired lift state.

Abstract: A diagnostic system for an engine includes a phaser control module that commands a first cam phaser position of a cam phaser of the engine for a first period and a second cam phaser position of the cam phaser for a second period, and a phaser diagnostic module that diagnoses a phaser control error for the cam phaser based on a first pressure of fluid supplied by an oil control valve to the cam phaser measured during the first period, and a second pressure of fluid supplied by the oil control valve to the cam phaser measured during the second period. The first and second pressures are measured on one of an advance-side fluid chamber and a retard-side fluid chamber of the cam phaser. The phaser diagnostic module detects one of a phaser mechanical fault and a phaser hydraulic system fault. A related method is also provided.

Abstract: An engine system includes a nitrogen oxide (NOx) estimation module and a diagnostic module. The NOx estimation module estimates an amount of NOx in an exhaust gas produced by an engine based on a predetermined function of a position of at least one of a camshaft phaser and an exhaust gas recirculation (EGR) valve. The diagnostic module determines a state of at least one of the camshaft phaser and the EGR valve based on a predetermined threshold and a difference between the estimated amount of NOx and an actual amount of NOx in the exhaust gas measured by a NOx sensor.