The scantool crankshaft position system varation learn function will ne inhibited if the engine coolant temperature is less than 158F..
The varation learn will be inhibited if any codes other than P1336 are set...
1) set the parking brake
2) start the engine and allow it to reach at least 158F
3) Turn off the ignition switch
4) Select the crankshaft varation learn procedure from the scantool special functions list
5) Follow the directions on the scantool, if the procedure is terminated, refer for important above for instructions
6) Observe DTC status for for DTC P1336
7) If the scantool indicates that DTC P1336 ran and passed, the crankshaft position system varation learn procedure is complete. If the scantool indicates DTC P1336 failed or not run, check for other DTC'*. If no DTC'* other than P1336 are set, repeat the crankshaft variation learn procedure as necessary..
From the service manual
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