Crankshaft Position System Variation Learn

The Crankshaft Position System Variation Learn procedure is also required when the following service procedures have been performed, regardless of whether DTC P0315 is set:

• An engine replacement
• A engine control module (ECM) or body control module (BCM) replacement
• A crankshaft balancer replacement
• A crankshaft removal and/or replacement
• A crankshaft position sensor disturbance/removal and/or replacement
• Any engine repairs which disturb the crankshaft to crankshaft position sensor relationship.

The ECM monitors certain component signals to determine if all the conditions are met to continue with the crankshaft position System Variation Learn Procedure. The scan tool only displays the condition that inhibits the procedure. The scan tool displays the signals of the following components:

• Crankshaft position sensors activity - If there is a crankshaft position sensor condition, refer to the applicable DTC that set.
• Camshaft position sensor signal activity - If there is a camshaft position sensor signal condition, refer to the applicable DTC that set.
• Engine coolant temperature (ECT) - If the engine coolant temperature is not warm enough, idle the engine until the engine coolant temperature reaches the correct temperature.

The ECM monitors certain component signals to determine if all the conditions are met to continue with the Crankshaft Position Variation Learn procedure.