Crankshaft Variation Learn Procedure

1. Set the parking brake. Block the drive wheels.
2. Close the hood. Start the engine and allow engine coolant temperature to reach at least 70°C (158°F). Turn OFF the engine, then turn the key to ON.
3. Select and enable the crankshaft position variation learn procedure with the Tech II, or equivalent, scan tool. Start the engine. Wait until instructed by the scan tool, then apply the brake pedal firmly.
4. Ensure that the transaxle is in Park. Increase accelerator pedal position until the CKP system variation learn fuel cut-off is reached at 4050 RPM for 3.5L, or 5150 RPM for 4.0L.
5. Release the accelerator pedal after the second fuel cut-off is reached. The crankshaft position system variation compensating values are learned when the RPM decreases back to idle. If the procedure terminates, check if vehicle is at normal operating temperature or any DTCs other than P1336 are set.
6. Observe the DTC status for DTC P1336. If the scan tool indicates that DTC P1336 ran and passed, the crankshaft position system variation learn procedure is complete. Use the scan tool to clear any DTCs. DTC P1336 will not automatically clear after a successful learn procedure. DTC P1336 will not clear from memory if the learn procedure was unsuccessful.

If the scan tool indicates that DTC P1336 failed or did not run, recheck for other DTCs that may have set during the procedure. If no DTCs other than P1336 are set, repeat the crankshaft position system variation learn procedure. If the learn procedure will not pass, a mechanical engine problem may exist.