Abstract: A method of rationalizing a sensor of a vehicle is provided. The method includes the steps of receiving an output from a wheel speed sensor, receiving an output from a lateral accelerometer, receiving an output from a steering angle sensor, determining whether an evaluation event exists based on the output from the wheel speed sensor, evaluating one of the steering angle sensor output or the lateral accelerometer sensor output during the evaluation event, and determining whether the other of the steering angle sensor output or the lateral accelerometer sensor output exceeds a test threshold value during the evaluation event.

Abstract: In at least some implementations, a method for initiating a test cycle in a vehicle diagnostic includes determining if vehicle operation parameters meet enablement criteria for a test cycle, determining a time to an impediment, comparing the time to the impediment to a duration of the test cycle, and initiating the test cycle when the time to the impediment is greater than the duration of the test cycle, and not initiating the test cycle when the time to the impediment is less than the duration of the test cycle.

Abstract: A method for controlling driveline torque on an electrified powertrain based on obstacle detection is provided. The electrified powertrain includes a first eMotor, a second eMotor and an internal combustion engine (ICE). An obstacle is detected proximate to the vehicle. A proximity signal is communicated to a first torque module that determines a first torque limit. A road surface is detected. A traction limit signal is communicated to a second torque module that determines a second torque limit. A road curvature is detected. A curvature signal is communicated to a third torque module that determines a third torque limit. A safety tolerance is determined based on the first, second and third torque limit. A first torque request is communicated to the ICE. A second torque request is communicated to the first eMotor. A third torque request is communicated to the second eMotor.

Abstract: In a method, a master cylinder pressure signal, a brake pedal position signal and a brake torque signal provided by an electronic control unit of an anti-lock braking system are rationalized. The master cylinder pressure signal is rationalized against the brake pedal position signal, the brake pedal position signal is rationalized against the master cylinder pressure signal and the brake torque signal is rationalized against the brake pedal position signal. The rationalizations utilize a difference between a maximum value of the signal being rationalized recorded during a maximum value learn period and a minimum value of the signal being rationalized recorded during a minimum value learn period. The rationalization is successful when this difference is greater than a rationalization value.

Abstract: A control system for a vehicle having an engine with an electronic stop-start (ESS) system and a manual transmission and a diagnostic method for a clutch pedal position sensor configured to output a voltage indicative of a level of depression of a clutch pedal that is configured to control engagement and disengagement of a clutch assembly of the manual transmission and a clutch interlock switch configured to output an on/off state indicative of a position of the clutch pedal relative to a fully-depressed position each utilize a controller configured to correlate the output voltage of the clutch pedal position sensor and the on/off state of the clutch interlock switch to detect a malfunction of the clutch pedal position sensor or the clutch interlock switch, and disable the ESS system when the malfunction of the clutch pedal position sensor or the clutch interlock switch is detected.

Abstract: Diagnostic systems and methods for a surge valve that selectively bypasses a compressor of a turbocharger of an engine involve receiving, by a controller, a barometric pressure signal indicative of a barometric pressure external to the engine, receiving, by the controller, a throttle inlet pressure (TIP) signal indicative of an air pressure at an inlet of a throttle valve of the engine and downstream from the surge valve and the compressor, and performing, by the controller, a diagnostic technique on the surge valve, the diagnostic technique comprising generating a pressure ratio signal that is a ratio of the TIP signal to the barometric pressure signal, applying a high-pass filter to the pressure ratio signal to obtain a filtered pressure ratio signal, and based on a quantity of detected pulses in the filtered pressure ratio signal that exceed the diagnostic threshold, detecting a malfunction of the surge valve.

Abstract: A diagnostic system for a crankcase ventilation system of a boosted engine includes a pressure sensor (i) disposed in-line along a make-up air (MUA) hose of the crankcase ventilation system and (ii) configured to measure a pressure in the MUA hose, the MUA hose connecting an induction system of the engine to a crankcase of the engine. The diagnostic system also includes a controller configured to: detect a mild acceleration operating condition of the engine; and in response to detecting the mild acceleration operating condition: obtain a plurality of pressure samples based on the measured pressure by the pressure sensor, compare the plurality of pressure samples to a fault threshold indicative of a disconnected MUA hose, and based on the comparing, generate a fault signal indicative of a disconnected MUA hose.

Abstract: In a method, a brake torque signal provided by an electronic control unit of an anti-lock braking system is validated. The brake torque signal is enabled for use as a brake event input signal upon being successfully validated for diagnostic and control routines of the vehicle that use the brake torque signal as a brake event input signal. If the brake torque signal fails validation, it is disabled for such use. The brake torque signal is validated by first rationalizing a brake pedal position signal and a master cylinder pressure signal. Once the brake pedal position signal is successfully rationalized with the master cylinder pressure signal, the brake pedal position signal is rationalized with the brake torque signal. The brake torque signal is successfully validated when both rationalizations are successful. The validation fails if either rationalization fails.