GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Oldsmobile 🢒 1999 🢒 Intrigue 🢒 Engine 🢒 Engine Controls - 3.8L 🢒 Crankshaft Position System Variation Learn

The crankshaft position (CKP) system variation compensating values are stored in the PCM non-volatile memory after a learn procedure has been performed. If the actual CKP system variation is not within the CKP system variation compensating values stored in the PCM, DTC P0300 may set. Refer to DTC P0300 Engine Misfire Detected .

The Crankshaft Position System Variation Learn Procedure should be performed if any of the following conditions are true:

    • DTC P1336 is set.
    • The PCM has been replaced.
    • The engine has been replaced.
    • The crankshaft has been replaced.
    • The crankshaft harmonic balancer has been replaced.
    • The CKP sensor has been replaced.

Caution: Before performing the Crankshaft Position System Variation Learning Procedure always set the vehicle parking brake and block the drive wheels in order to prevent personal injury. Release the throttle immediately when the engine starts to decelerate in order to eliminate over revving the engine. Once the learn procedure is completed, the control module will return engine control to the operator and the engine will respond to the throttle position.

Important: The scan tool CKP system variation learn function is inhibited if the engine coolant temperature is less than 70°C (158°F). Allow the engine to warm to at least 70°C (158F) before attempting the CKP system variation learn procedure.

The scan tool CKP system variation learn function is inhibited if any powertrain DTCs other than DTC P1336 are set before or during the CKP system variation learn procedure. Diagnose and eliminate any DTCs set.

The CKP system variation learn function is inhibited if the PCM detects a malfunction involving the CKP signal circuit, the 3X reference circuit, or the 18X reference circuit.

   •  If the scan tool indicates a problem with the camshaft position (CMP) sensor signal, refer to DTC P0341 Camshaft Position (CMP) Sensor Performance .
   • If the scan tool indicates a problem with the 3X crankshaft position sensor signal, refer to DTC P1374 Crankshaft Position (CKP) High to Low Resolution Frequency Correlation .
   •  If the scan tool indicates a problem with the 18X crankshaft position sensor signal, refer to DTC P0336 Crankshaft Position (CKP) Sensor Circuit .

  1. Set the parking brake.
  2. Block the drive wheels.
  3. Ensure that the hood is closed.
  4. Start the engine and allow the engine coolant temperature to reach at least 70°C (158°F).
  5. Turn off the ignition switch.
  6. Select and enable the CKP variation learn procedure with the scan tool.
  7. Start the vehicle.
  8. Apply and hold the service brake pedal firmly.
  9. Ensure that the transaxle is in Park.
  10. Increase accelerator pedal position until the CKP system variation learn fuel cutoff is reached. CKP system variation learn fuel cutoff is reached at 5150 RPM. Immediately release the accelerator pedal when fuel cutoff is reached.
  11. The CKP system variation compensating values are learned when RPM decreases back to idle. If the procedure terminates, refer to the Important above for instructions.
  12. Observe the DTC status for DTC P1336.
  13. If the scan tool indicates that DTC P1336 ran and passed, the CKP system variation learn procedure is complete. If the scan tool indicates DTC P1336 failed or has not run, inspect for other DTCs. If no DTCs other than P1336 are set, repeat the CKP system variation learn procedure as necessary.