CKP System Variation Learn Procedure
The scan tool monitors certain component signals to determine if all conditions are met to continue with the procedure. The scan tool only displays the condition that inhibits the procedure while monitoring the following components:
CKP sensors activity-If there is a CKP sensor condition, refer to the applicable DTC that was set
Camshaft position (CMP) sensor activity-If there is a CMP sensor condition, refer to the applicable DTC that was set
Engine coolant temperature (ECT)-If the ECT is not warm enough, idle the engine until the ECT reaches normal operating temperature
NOTE: For additional diagnostic information, refer to DTC P1336.
Install a scan tool
Monitor the powertrain control module for diagnostic trouble codes (DTCs). If other DTCs are set, except DTC P1336, refer to the Diagnostic Trouble Code List for the applicable DTC that was set
Select the crankshaft position (CKP) variation learn procedure
Observe the fuel cut-off
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
Maintain pressure on the brake pedal
Start and idle the engine
Place the vehicles transmission in Park (A/T) or Neutral (M/T).
With the scan tool, enable the CKP system variation learn procedure.
Slowly increase the engine speed to the RPM that you observed.
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.
Immediately release the throttle when fuel cut-off is reached
The scan tool should display the Learn Status: "Learned this ignition"
If the scan tool does not display this message and no additional DTCs set, refer to Symptoms - Engine
If a DTC set, refer to Diagnostic Trouble Code (DTC) List for the applicable DTC that set
Turn OFF the ignition for 30 seconds after the learn procedure is completed successfully
