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Originally Posted by GMMerlin
You will need to perform the crankshaft variance learn procedure.
The scan tool crankshaft position system variation learn function will be inhibited if the engine coolant temperature is less than 70°C (158°F). Allow the engine to warm to at least 70°C (158F) before attempting the Crankshaft Position System Variation Learn procedure.
The Crankshaft Position System Variation Learn function will be inhibited if any powertrain DTCs other than DTC P1336 are set before or during the Crankshaft Position System Variation Learn procedure. Diagnose and repair any DTCs, if set.
Set the parking brake.
Block the drive wheels.
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.
Select and enable the Crankshaft Position Variation Learn Procedure with the scan tool.
Start the engine.
Wait until instructed by the scan tool, then apply the brake pedal firmly.
Ensure that the transaxle is in Park.
Increase accelerator pedal position until the CKP System Variation Learn fuel cutoff is reached at 4050 RPM. Release the accelerator pedal after the second fuel cutoff is reached.
The crankshaft position system variation compensating values are learned when the RPM decreases back to idle. If the procedure terminates, refer to the Important above for instructions.
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.
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What kind of scan tool is necessary to perform this procedure?
A domestic?, a professional?