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Crankshaft Position System Variation Learn Procedure

NOTE: For additional diagnostic information, see DTC P0336: CRANKSHAFT POSITION SENSOR A CIRCUIT PERFORMANCE .
  1. Install a scan tool.
  2. With a scan tool, monitor the powertrain control module for DTCs. If other DTCs are set, except DTC P1336, see DIAGNOSTIC TROUBLE CODE DEFINITIONS .
  3. With a scan tool, select the crankshaft position variation learn procedure.
  4. The scan tool instructs you to perform the following items:
    • Accelerate to Wide Open Throttle (WOT).
    • Release and observe the fuel cut-off for the engine that you are performing the learn procedure on.
    • Engine should not accelerate beyond calibrated RPM value.
    • Release throttle immediately if value is exceeded.
    • Block drive wheels.
    • Set parking brake.
    • DO NOT apply brake pedal.
    • Cycle the ignition from off to on.
    • Apply and hold the brake pedal.
    • Start and idle engine.
    • Turn A/C off.
    • Vehicle must remain in Park or Neutral.
    • 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, see DIAGNOSTIC TROUBLE CODE DEFINITIONS .
      2. Camshaft Position (CMP) sensor activity. If there is a CMP sensor condition, see DIAGNOSTIC TROUBLE CODE DEFINITIONS .
      3. Engine Coolant Temperature (ECT). If the ECT is not warm enough, idle the engine until the ECT reaches the correct temperature.
  5. With the scan tool, enable the crankshaft position system variation learn procedure.
    6. 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.
  6. Accelerate to WOT.
  7. Immediately release the throttle when fuel cut-off is reached.
  8. The scan tool displays Learn Status: LEARNED THIS IGNITION. If the scan tool indicates that DTC P1336 ran and passed, the CKP variation learn procedure is complete. If the scan tool indicates DTC P1336 failed or did not run, see DTC P1336: CRANKSHAFT SYSTEM VARIATION NOT LEARNED . If any other DTCs set, see DIAGNOSTIC TROUBLE CODE DEFINITIONS .
  9. Turn off the ignition for 30 seconds after the learn procedure is completed successfully.
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