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Home >> Chevrolet >> 2003 >> Monte Carlo LS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics - 3.4L >> Programming >> CKP System Variation Learn Procedure
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CKP System Variation Learn Procedure

  1. Connect scan tool to DLC.
  2. Monitor the Powertrain Control Module (PCM) for DTCs using scan tool. If other DTCs are set, except DTCs P1336, refer to DIAGNOSTIC TROUBLE CODE DEFINITIONS  for the applicable DTC that set.
  3. Select the CRANKSHAFT POSITION VARIATION LEARN PROCEDURE using the scan tool.
  4. Observe the fuel cut-off specifications for that engine.
  5. The scan tool instructs you to perform the following:
    • Block drive wheels.
    • Apply and hold the brake pedal.
    • Cycle the ignition switch from OFF to RUN position.
    • 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. CKP Sensors Activity  - If there is a CKP sensor condition, refer to the applicable DTC that set.
      2. Camshaft Position Sensor Activity  - If there is a CMP sensor condition, refer to the applicable DTC that set.
      3. Engine Coolant Temperature  - If the ECT is not warm enough, idle the engine until the ECT reaches the correct temperature.
  6. Enable the crankshaft position system variation learn procedure using the scan tool.
    7. 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.
  7. Slowly increase the engine speed to the 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 the scan tool does NOT display this message and no additional DTCs set, check for a engine mechanical problem. See appropriate article in ENGINES. If a DTC set, see DIAGNOSTIC TROUBLE CODE DEFINITIONS  under DIAGNOSTIC TESTS, for the applicable DTC that set.
  10. Turn ignition switch to OFF position for 30 seconds after the learn procedure is completed successfully.
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