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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 70 (Engine Controls Self-Diagnostics - 4.3L) >> Diagnostic Tests >> DTC P1336: Crankshaft System Variation Not Learned >> Description

DTC P1336: Crankshaft System Variation Not Learned: Description

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The crankshaft position system variation learn feature is used to calculate reference period errors caused by slight tolerance variations in the crankshaft, and the crankshaft position sensors. The calculated error allows the Powertrain Control Module (PCM) to accurately compensate for reference period variations. This enhances the ability of the PCM to detect misfire events over a wider range of engine speed and load. The PCM stores the crankshaft position system variation values after a learn procedure has been performed. This Diagnostic Trouble Code (DTC) set indicates that the crankshaft position system variation values have not been stored in the PCM and the crankshaft position system variation learn procedure must be performed.

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