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CAUTION: Before performing Crankshaft Position Sensor (CKP) system variation learn procedure, always set parking brake and block drive wheels in order to prevent personal injury. Release throttle immediately when engine starts to decelerate in order to eliminate over revving engine. Once learn procedure has been completed, control module will return engine control to operator and engine will respond to throttle position.

NOTE: For additional diagnostic information, see appropriate SELF-DIAGNOSTICS article.

Install a scan tool.
With a scan tool, monitor the powertrain control module for DTCs. If other DTCs are set, except DTC P1336, see appropriate SELF-DIAGNOSTICS article.
With a scan tool, select the crankshaft position variation learn procedure.
Observe the fuel cut-off for the engine that you are performing the learn procedure on.
The scan tool instructs you to perform the following:
- Block the drive wheels.
- Apply the vehicles parking brake.
- Cycle the ignition from OFF to ON.
- Apply and hold the brake pedal.
- Start and idle the engine.
- Turn OFF the A/C.
- Place the vehicle's transmission in Park (A/T) or Neutral (M/T).
- The scan tool monitors certain component signals to determine if all the conditions are met to continue with the procedure. The scan tool only displays the condition that inhibits the procedure. The scan tool monitors the following components:
  1. Crankshaft Position (CKP) sensor activity. If there is a CKP sensor condition, refer to the applicable DTC that set. See appropriate SELF-DIAGNOSTICS article.
  2. Camshaft Position (CMP) sensor activity. If there is a CMP sensor condition, refer to the applicable DTC that set. See appropriate SELF-DIAGNOSTICS article.
  3. 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.
With the scan tool, enable the crankshaft position system variation learn procedure.

NOTE: While the learn procedure is in progress, release the throttle immediately when the engine starts to decelerate. The engine control is returned to the operator and the engine responds to throttle position after the learn procedure is complete.

Slowly increase the engine speed to the RPM that you observed.
Immediately release the throttle when fuel cut-off is reached.
The scan tool displays Learn Status: Learned this ignition. If the scan tool does NOT display this message and no additional DTCs set, see appropriate SELF-DIAGNOSTICS article. If a DTC set, see appropriate SELF-DIAGNOSTICS article.
Turn OFF the ignition for 30 seconds after the learn procedure is completed successfully.