Cam phaser control systems and methods for engine off conditions

A control system of a vehicle, comprising:

• an electric motor configured to phase rotation of a camshaft of an engine relative to rotation of a crankshaft of the engine;
• a current module configured to, while the engine is off and an ignition system of the vehicle is on before the engine is started:
• selectively transition a current signal back and forth between a first state and a second state;
• and
• a motor driver module configured to, while the engine is off and the ignition system of the vehicle is on before the engine is started:
• apply power to the electric motor from a battery and adjust a position of the camshaft toward a predetermined position when the current signal is in the first state;
• and
• disconnect the electric motor from the battery and allow the position of the camshaft to move away from the predetermined position when the current signal is in the second state.

A control system of a vehicle, comprising:

• a cam phaser configured to phase rotation of a camshaft of an engine relative to rotation of a crankshaft of the engine;
• a current module configured to, while the engine is off and an ignition system of the vehicle is on during an auto-stop portion of an auto-stop/start event:
• selectively transition a current signal back and forth between a first state and a second state;
• and
• a motor driver module configured to, while the engine is off and the ignition system of the vehicle is on during the auto-stop portion of the auto-stop/start event:
• apply power to an electric motor from a battery and adjust a position of the camshaft toward a predetermined position when the current signal is in the first state;
• and
• disconnect the electric motor from the battery and allow the position of the camshaft to move away from the predetermined position when the current signal is in the second state.