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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 133 (ENGINE CONTROLS SELF-DIAGNOSTICS - 4.3L)PROGRAMMINGCKP SYSTEM VARIATION LEARN PROCEDURE
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6

CKP System Variation Learn Procedure

2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION CKP System Variation Learn Procedure
WARNING: This page is about a different car, the 2003 GMC Savana and 2003 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: For additional diagnostic information, see DTC P0336: CRANKSHAFT POSITION SENSOR 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 P0315, 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:
    • Accelerate to Wide Open Throttle (WOT).
    • Release throttle when fuel cut-off occurs.
    • 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 Sensor (CKP) Sensor Activity

        If there is a CKP sensor condition, refer to the applicable DTC that set.

      2. Camshaft Position (CMP) Sensor Activity

        If there is a CMP sensor condition, refer to the applicable DTC that set.

      3. Engine Coolant Temperature (ECT)

        If the engine coolant temperature is not warm enough, idle the engine until the engine coolant temperature 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 P0315 ran and passed, the CKP variation learn procedure is complete. If the scan tool indicates DTC P0315 failed or did not run, see DTC P0315 . If any other DTCs set, refer to DIAGNOSTIC TROUBLE CODE DEFINITIONS  for the applicable DTC.
  9. Turn OFF the ignition for 30 seconds after the learn procedure is completed successfully.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.