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Crankshaft Position Sensor System Variation Learn Procedure

WARNING: This page is about a different car, the 2002 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
WARNING: Before performing Crankshaft Position (CKP) sensor 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: To perform CKP variation learn procedure, a switchover to gasoline operation is necessary. Remove CNG fuse (20-amp) located in underhood fuse block to perform switchover.
NOTE: Battery must be fully charged and in good condition. Scan tool connection at Data Link Connector (DLC) should be clean and tight before starting crankshaft position system variation learn procedure.
  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, refer to DIAGNOSTIC TROUBLE CODE DEFINITIONS  for the applicable DTC that set.
  3. With a scan tool, select Crankshaft Position (CKP) variation learn procedure.
  4. Observe the fuel cut-off for engine that you are performing the learn procedure on.
  5. The scan tool instructs you to perform the following:
    • Block drive wheels.
    • Apply parking brake.
    • Cycle ignition from OFF to ON.
    • Apply and hold brake pedal.
    • Start and idle engine.
    • Turn OFF A/C.
    • Place 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. CKP sensor activity. If there is a CKP sensor condition, refer to applicable DTC that set. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  .
      2. CMP sensor activity. If there is a CMP sensor condition, refer to applicable DTC that set.
      3. ECT activity. If engine coolant temperature is not warm enough, idle engine until coolant temperature reaches the correct temperature.
  6. With the scan tool, enable the CKP system variation learn procedure.
    7. NOTE: While the learn procedure is in progress, release throttle immediately when engine starts to decelerate. The engine control is returned to operator and engine responds to throttle position after learn procedure is complete.
  7. Slowly increase engine speed to RPM that you observed.
  8. Immediately release the throttle when fuel cut-off is reached.
  9. The scan tool displays Learn Status: Learned this ignition. If scan tool does NOT display this message and no additional DTCs set, diagnose for engine mechanical problem. If a DTC sets, refer to DIAGNOSTIC TROUBLE CODE DEFINITIONS  .
  10. Turn ignition off for 30 seconds after the learn procedure is completed successfully.
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