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HOMESERVICE MANUALSCHEVROLET2002CAVALIER BASE, 4D SEDAN, 2.4 TREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS SELF-DIAGNOSTICS - 2.4LPROGRAMMINGCKP SYSTEM VARIATION LEARN PROCEDURE
2002 Chevrolet Cavalier Base, 4D Sedan, 2.4 T

CKP System Variation Learn Procedure

2002 Chevrolet Cavalier Base, 4D Sedan, 2.4 TSECTION CKP System Variation Learn Procedure
NOTE: A Crankshaft Position (CKP) system variation learn procedure must be performed any time a change is made to the crankshaft sensor-to-crankshaft relationship. Changing the crank sensor to crankshaft relationship will not allow the PCM to detect misfire at all speeds and loads accurately, resulting in a possible false misfire DTC being set.

Removing a part for inspection and then reinstalling the same part is considered a disturbance. A false DTC P0300 could be set if this procedure is not performed.

The learn procedure is required after the following service procedures have been performed, regardless of whether or not DTC P1336 is set: A PCM replacement, an engine replacement, crankshaft replacement, CKP sensor replacement, or any engine repair which disturbs the crankshaft/harmonic balancer relationship to the crankshaft position sensor.

A fully warmed up engine is critical to learning the variation correctly. If a valid learn occurs, no other learns can be completed on that ignition cycle.

If the engine cuts out before the specified learn procedure engine speed or at normal fuel cut-off RPM, the PCM is not in the learn procedure mode. Review the crankshaft position system variation learn procedure and re-enable the learn procedure. Verify that the scan tool displays Test In Progress.

WARNING: Before performing the Crankshaft Position System Variation Learning Procedure, always set vehicle parking brake and block drive wheels in order to prevent personal injury. Release throttle immediately when engine starts to decelerate in order to eliminate over-revving engine. Once learn procedure is completed, control module will return engine control to operator and engine will respond to throttle position.
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
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