Emission Control Systems: Testing and Inspection

Flow Of Diagnosis:

FLOW OF DIAGNOSIS
The flow of diagnosis is the where to start when diagnostics are necessary. The steps that the technician should follow are outlined below:

Review The Driveability And Repair History Worksheets
These worksheets are to be filled out by the customer when the vehicle is brought in for diagnostics. The technician should review both the driveability and repair history worksheets. Refer to Technical Management Support / Vehicle Inspection Forms & Symptom Checklists.

Verify The Customer Complaint
To verify the customer complaint the technician will need to run or road test the vehicle and verify that the customer complaint is a deviation from normal operation.

Check For Applicable Technical Service Bulletins
Check all available service information. This includes PROM or manual updates, warranty, and recall information. Difficult to diagnose problems are often described in periodical publications by experienced technicians who have encountered like symptoms in similar vehicles.

Checking The Basics
All diagnostics should begin with checking the basics.

Computers and Controls / Flow of Diagnostics
The Computers and Controls / Flow of Diagnostics is an organized approach to identifying a problem created by an electronic powertrain control system malfunction.