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Crankshaft Position Sensor Variation Learn Procedure: Notes

WARNING: This page is about a different car, the 2001 GMC Safari and 2001 Chevrolet Astro. However, it is still accessible from the selected car via links, so may be relevant.
  1. This procedure must be performed if any of following have been done or exist:
    • Electronically Erasable Programmable Read Only Memory (EEPROM) was reprogrammed.
    • Diagnostic Trouble Code (DTC) P1336 exists.
    • Crankshaft, Crankshaft Position (CKP) Sensor, engine, Powertrain Control Module (PCM) or vibration damper have been replaced.
  2. Using scan tool, check for stored DTCs. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If no DTCs exist, or if DTC P1336 exists, go to next step. If any DTCs exist except P1336, perform test procedures for specified DTC and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. Ensure all DTCs are cleared from PCM. Go to next step.
  3. Prepare vehicle for Crankshaft, Crankshaft Position (CKP) Sensor variation learn procedure. Ensure ignition is switch is in OFF position. Apply parking brake. Block front wheels. Ensure hood is closed. Start engine and warm engine until engine coolant temperature is at least 150°F (70°C). Turn ignition switch to OFF position.
    4. NOTE: Ensure engine coolant temperature is at least 150°F (70°C) before performing CKP sensor variation learn procedure.
  4. Using scan tool, select and enable CKP SENSOR VARIATION LEARN procedure. Start engine. Apply service brakes. Ensure transaxle is in Park.
  5. Slowly increase engine speed to 4000 RPM.
  6. Immediately release throttle when engine speed start to decreases (PCM commanded).
  7. If scan tool shows CKP learn procedure is complete, go to step  10 . If scan tool does not show CKP learn procedure is complete, go to next step.
  8. Attempt CKP learn procedure as many as 3 times. If scan tool indicates that learn procedure is complete, go to step  10 . If scan tool does not indicate that learn procedure is complete, go to next step.
  9. Check CKP sensor and crankshaft reluctor wheel for damage. If problem is found, go to step  11 . If no problem is found see DIAGNOSTIC AIDS  .
  10. Turn ignition switch to OFF position for 15 seconds, then go to step  12 .
  11. Replace CKP sensor and/or reluctor wheel. After replacing CKP sensor, perform CKP SENSOR VARIATION LEARN procedure. After performing learn procedures, go to next step.
  12. Using scan tool, select DTC, CLEAR INFO. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter this DTC. Operate vehicle within conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, repeat step  2 . After performing learn procedures, go to next step.
  13. Using scan tool, select CAPTURE INFO, REVIEW INFO. If any undiagnosed DTCs are displayed, go to applicable DTC test.
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