Diagnostic System Check
DIAGNOSTIC SYSTEM CHECKDESCRIPTION
The Diagnostic System Check is an organized approach to identifying a condition created by an electronic engine control system malfunction. The Diagnostic System Check must be the starting point for any driveability concern. The Diagnostic System Check directs the service technician to the next logical step in diagnosing the concern. Understanding the table and using the table correctly reduces diagnostic time and prevents the replacement of good parts.
TEST DESCRIPTION
Steps 1-2:
Steps 3-5:
Steps 6-8:
Steps 9-12:
The number below refers to the step number on the diagnostic table.
11. This step is for areas that have inspection and maintenance testing procedures for emissions testing. Use this step if the testing facility found one or more I/M system statuses that did not set.