Engine Controls - CKP Learn Procedure

File In Section: 06 - Engine/Propulsion System

Bulletin No.: 04-06-04-067

Date: October, 2004

INFORMATION

Subject:
Information on CKP Learn Procedure After Engine Control Module (ECM) Reflash or Replacement

Models:
2004-2005 Chevrolet Aveo, Epica, Optra, Vivant
2005 Pontiac Wave (Canada Only)

with Delphi Engine Control Module (ECM)

Important:
This bulletin does NOT apply to vehicles with a Siemens controller. The software within the Siemens controller features a built-in continuous learn procedure. The Delphi controller software does not have this feature so the learn procedure must be performed.

This bulletin is being issued to remind technicians that when an engine control module (ECM) is reflashed or replaced, and the driveplate of the flywheel has been replaced, the crankshaft position (CKP) system variation learn procedure must be performed (refer to CKP System Variation Learn Procedure in SI). If this procedure is not performed, illumination of the malfunction indicator lamp (MIL) could result.





The Delphi controllers shown need to have the CKP system variation learn procedure performed.














The Siemens controllers shown DO NOT require the CKP system variation learn procedure.





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