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HOMESERVICE MANUALSCHEVROLET1998SUBURBAN K2500, 7.4 J, PART TIMEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 101 (COMPUTER RELEARN PROCEDURES)COMPUTER RELEARN PROCEDURES - CARSCAVALIER & SUNFIRECRANKSHAFT POSITION (CKP) SENSOR VARIATION LEARN PROCEDURE
1998 Chevrolet Suburban K2500, 7.4 J, Part Time

Crankshaft Position (CKP) Sensor Variation Learn Procedure

1998 Chevrolet Suburban K2500, 7.4 J, Part TimeSECTION Crankshaft Position (CKP) Sensor Variation Learn Procedure
WARNING: This page does not describe the selected car, but rather 69 other vehicles, including the 1999 Saturn SW2, 1999 Saturn SW1, 1999 Saturn SL2, 1999 Saturn SL1, and 1999 Saturn SL. However, it is still accessible from the selected car via links, so may be relevant.
  1. Procedure must be performed if any of the following have been done or exist:
    • EEPROM was reprogrammed.
    • If Diagnostic Trouble Code (DTC) P1336 exists.
    • If crankshaft, crankshaft position sensor, engine or Powertrain Control Module (PCM) have been replaced.
    • Any repairs have been performed that disturbs the crankshaft or vibration damper to the crankshaft position sensor relationship.
  2. CKP sensor variation compensating values are stored in Powertrain Control Module (PCM) after a learn procedure has been performed. If actual CKP sensor values are not within specification, Diagnostic Trouble Code (DTC) P0300 will be stored in the PCM.
  3. Ensure battery is fully charged. Ensure cable is properly connected on Data Link Connector (DLC). Apply parking brake. Block front wheels. Ensure hood is closed.
  4. Place transaxle in Park (A/T models) or Neutral (M/T models). Ensure all accessories are off. Start engine and warm engine until engine coolant temperature is at least 185°F (85°C).
  5. Apply service brakes. With engine idling, use scan tool to select and enable CKP sensor variation learn procedure.
  6. Accelerate engine until CKP sensor variation learn procedure fuel cut off is obtained and engine starts to decelerate or cut out. Quickly release throttle to idle position once CKP sensor variation learn procedure is obtained and engine decelerates or cuts out. Once CKP sensor variation values are learned, the PCM will return engine control to the 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 or cut out.
  7. Using scan tool, verify that CKP sensor variation learn procedure was completed. If CKP sensor variation learn procedure was not completed, go to next step. If CKP sensor variation learn procedure was completed, shut engine off and remove scan tool.
  8. If CKP sensor variation learn procedure was not completed, repeat entire procedure up to 10 times. If PCM will not learn the CKP sensor variation compensating values, a DTC P1336 should be stored in the PCM. Perform test procedures for DTC P1336 and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
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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.