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Crankshaft Position (CKP) Sensor Variation Learn Procedure (4.3L, 5.0L, 5.7L & 7.4L Except Calif.)

  1. Procedure must be performed if any of following have been done:
    • EEPROM was reprogrammed.
    • If CKP sensor was removed or replaced.
    • VCM was replaced.
  2. Install scan tool on Data Link Connector (DLC). Apply parking brake. Block rear wheels. Ensure hood is closed.
  3. Place transmission in Park (A/T models) or Neutral (M/T models). Start and warm engine until engine coolant temperature is at least 150°F (65°C). Ensure all accessories are off.
  4. Apply service brakes. With engine idling, use scan tool to select and enable CKP sensor variation learn procedure.
  5. Gradually accelerate engine to 4000 RPM. Quickly release throttle to idle position once CKP sensor variation learn procedure fuel cut-off is obtained and engine starts to decelerate. Once CKP sensor variation values are learned, VCM will return engine control to operator and engine will respond to throttle position.
    CAUTION: Ensure throttle is quickly released to idle position once CKP sensor variation learn procedure fuel cut-off is obtained and engine starts to decelerate.
  6. If CKP sensor variation learn procedure was completed, turn ignition off for at least 15 seconds. Remove scan tool. If CKP sensor variation learn procedure was not completed, DTC P1336 will set. Perform test procedures for DTC P1336 and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
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