Six Step Troubleshooting Procedure

SIX-STEP TROUBLESHOOTING PROCEDURE
The six-step diagnostic troubleshooting procedure allows a logical process through which problems in any of the vehicle's systems may be diagnosed.

1. Verification of complaint
2. Verification of any related symptoms
3. Symptom analysis
4. Problem isolation
5. Repair of isolated problem
6. Verification of proper operation

Step One: Verification of Complaint
• Does the problem really exist?
• Is it an intermittent or constant problem?
• Obtain as much information as possible from the customer.
• Duplicate the problem conditions.

Step Two: Verification of Related Symptoms
• Conduct operational checks on all circuits connected to the problem circuit.
• The problem must lie between the last negative and first positive symptom found during testing.

Step Three: Symptom Analysis
• Use the wiring diagrams.
• Isolate the problem area.
• Develop a diagnostic plan.
• Determine what checks to make and where to make them.
• Use a logical procedure.

Step Four: Problem Isolation
• Use the wiring diagrams.
• Use the proper test equipment.
• Use your diagnostic plan.
• Find the problem.

Step Five: Repair of Isolated Problem
• Repair or replace the faulty component(s)/circuit.

Step Six: Verification of Proper Operation
• Be certain that the vehicle, including the repaired system(s), works properly before returning it to the customer.