Crankshaft Position Sensor Variation Learn Procedure: Description

Crankshaft Position (CKP) system variation compensating values are stored in Powertrain Control Module (PCM) non-volatile memory after learn procedure has been performed. If actual crankshaft position system variation is not within crankshaft position system variation compensating values stored in PCM, DTC P0300 may set. CKP system variation learn procedure should be performed if any of the following conditions are true:

• DTC P1336 is set.
• PCM has been replaced.
• Engine has been replaced.
• Crankshaft has been replaced.
• Crankshaft harmonic balancer has been replaced.
• Crankshaft Position (CKP) sensor has been replaced.

Set vehicle parking brake and block drive wheels when performing CKP system variation learn procedure to prevent personal injury. Release throttle when engine reaches the SECOND fuel cut off. Leaving throttle open during the fuel cut-off will allow engine to decel at an even rate. Once learn procedure is completed, PCM will return the engine control to the operator and engine will respond to throttle position.

Scan tool crankshaft position system variation learn function cannot be performed if Engine Coolant Temperature (ECT) is less than 158°F (70°C). Scan tool crankshaft position system variation learn function will be inhibited if any powertrain DTCs other than DTC P1336 are set before or during CKP system variation learn procedure. Diagnose and repair any DTCs if set.