CKP System Variation Learn Procedure

Install a scan tool.
Using scan tool, monitor the Powertrain Control Module (PCM) for DTCs. If other DTCs are set, except DTC P1336, refer to DIAGNOSTIC TROUBLE CODE DEFINITIONS .
With a scan tool, select the CKP variation learn procedure.
Observe fuel cut-off for the engine that you are performing the learn procedure on.
The scan tool instructs you to perform the following:
- Block drive wheels.
- Apply vehicles parking brake.
- Cycle ignition from off to ON.
- Apply and hold the brake pedal.
- Start and idle the engine.
- Turn off the A/C.
- Place 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. CKP sensors activity. If there is a CKP sensor condition, refer to the applicable DTC that set.
  2. CMP sensor activity. If there is a CMP sensor condition, refer to the applicable DTC that set.
  3. ECT sensor activity. If ECT is not warm enough, idle engine until ECT reaches the correct temperature.
With the scan tool, enable the CKP system variation learn procedure.
NOTE: While the learn procedure is in progress, release throttle immediately when engine starts to decelerate. The engine control is returned to the operator and engine responds to throttle position after the learn procedure is complete.
Slowly increase 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 scan tool does NOT display this message and no additional DTCs set, diagnose for and engine mechanical problem. If a DTC is set, refer to DIAGNOSTIC TROUBLE CODE DEFINITIONS . Diagnose affected DTC(s).
Turn ignition off for 30 seconds after the learn procedure is completed successfully.