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CKP System Variation is needed to compensate for minor variations in manufacturing tolerances that might alter the relationship of the crankshaft position sensor to the reluctor wheel, possibly resulting in a false misfire DTC and MIL illumination.
CKP positions must be relearned when any of these parts are removed or replaced:
CKP sensor
Front cover or bracket holding the crankshaft position sensor
Target wheel (reluctor)
Crankshaft
Engine block
Engine assembly
PCM
The learn procedure is required after the following service procedures have been performed, regardless of whether or not DTC P1336 is set:
PCM replacement
Engine replacement
Crankshaft replacement
Crankshaft balancer replacement
Crankshaft position sensor replacement
Any engine repair(s) which disturbs the crankshaft/harmonic balancer to crankshaft position sensor relationship
CKP variation is only relearned with a scan tool. It does not relearn “by itself.”
1. Make sure no DTCs are set. If DTCs
are set, service them before performing the procedure.
2. The service brake must be firmly applied and the transmission in Park for an automatic or Neutral for a manual.
3. A/C must be “OFF” and the hood closed.
4. At this point, use the scan tool and select CASE Learn:
5. Open the accelerator to the CASE fuel cutoff speed and release it as soon as the PCM cuts off the fuel and the engine begins to decelerate.
6. The scan tool will identify when the procedure is complete
~Larry~
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ClubGP Member 6530
Since 2001
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