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Home › Pontiac › 2001 › Grand Am GT1 › Repair and Diagnosis › Accessories & Equipment › Communication Devices › Body Control Modules › Programming › Powertrain Control Module › Crankshaft Position Sensor Variation Learn Procedure (3.4L)

Crankshaft Position Sensor Variation Learn Procedure (3.4L)

  1. Procedure must be performed if any of the following have been done or exist:
    • EEPROM was reprogrammed.
    • If Diagnostic trouble code P1336 exists.
    • If crankshaft, Crankshaft Position Sensor (CKP), engine, Powertrain Control Module (PCM) or vibration damper have been replaced.
  2. CKP sensor variation compensating values are stored in PCM after a learn procedure has been performed. If actual CKP sensor values are not within specification, DTC P0300 will be stored in the PCM.
  3. Connect scan tool to Data Link Connector (DLC). DLC is located under left side of instrument panel. Using scan tool, check for stored DTCs. If no DTCs exist or if DTC P1336 exists, go to next step. If any DTCs exist except for 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.
  4. Ensure ignition 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 158°F (70°C). Turn ignition switch to OFF position.
    NOTE: Ensure engine coolant temperature is at least 158°F (70°C) before performing CKP sensor variation learn procedure.
  5. Using scan tool, select and enable crankshaft position system variation learn procedure.
  6. Start vehicle. Apply and hold brake pedal firmly. Ensure transaxle is in Park. Steadily increase engine speed until fuel cut-off is reached at 5150 RPM and hold. Release accelerator pedal after second fuel cut-off has been reached. Crankshaft position system variation compensating values are learned when RPM decreases back to idle.
  7. Check scan tool for status of DTC P1336. If scan tool indicates DTC P1336 ran and passed, CKP sensor variation learn procedure fuel cut-off is complete. If scan tool indicates DTC P1336 failed or was not run, check for any other DTCs. If any other DTCs exist, perform test procedures for specified DTC and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If no other DTCs exist, repeat CKP sensor variation learn procedure.
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