Basic Diagnostic Procedure - Testing
Diagnosis of the CCC system should be performed in the following order:
- Make sure that all engine systems not related to the CCC system are operating properly. Do not proceed with testing unless all other problems have been repaired.
- Go to the Diagnostic Circuit Check chart and follow all instructions given there to verify proper operation of ECM self-diagnostics and to obtain any stored trouble codes.
- If trouble codes were displayed, determine whether the codes are "intermittent" or "hard". Go to numbered Code Charts for further diagnosis of stored trouble codes.
- If no trouble codes were displayed, proceed to Field Service Mode on TBI models (part of Diagnostic Circuit Check).
- If no trouble is indicated by any of these charts, use the TROUBLE SHOOTING material in this article. The comments there will send you to the proper component charts or tell you what to fix.
- After any repairs have been made, always perform System Performance Check. Clear any trouble codes.
NOTE:
Each of the steps listed here are described later in this section. If you are unsure of the proper way to test, read through the following material.