Diagnostic Charts

The diagnostic charts are used to find and repair problems which the on-car diagnostics have found. These charts include:

Charts which test the reliability of the self-diagnostic system.
Charts which help fix problems which are "SERVICE ENGINE SOON" light related.
Charts which test the computerized fuel control system performance.
Charts which help fix a problem when the on-car diagnostics don't work.
ENGINE CRANKS BUT WON'T RUN charts. Refer to the appropriate TROUBLE SHOOTING chart in the CCC TESTS W/O CODES article in this section.
Charts where a stored trouble code leads you to a particular problem. See ECM TROUBLE CODE DEFINITION and DIAGNOSTIC AIDS in the 3.3/3.8L PFI TESTS/CODES article in this section.
Charts which are used because the FIELD SERVICE MODE CHECK found a problem.

NOTE: Although there are many charts connected with computer diagnosis, only 2 charts are needed to prove system is operating properly. Normally, only 3 charts are necessary to find a problem, if one exists.