STEP
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DESCRIPTION
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STEP 1
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Get detailed information about the conditions and the environment when the incident occurred. The following are key pieces of information required to make a good analysis:
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WHAT
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Vehicle Model, Engine, Transmission/Transaxle and the System (i.e. Radio).
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WHEN
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Date, Time of Day, Weather Conditions, Frequency.
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WHERE
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Road Conditions, Altitude and Traffic Situation.
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HOW
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System Symptoms, Operating Conditions (Other Components Interaction). Service History and if any After Market Accessories have been installed.
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STEP 2
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Operate the system, road test if necessary. Verify the parameter of the incident. If the problem cannot be duplicated, refer to “Incident Simulation Tests”.
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STEP 3
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Get the proper diagnosis materials together including:
- Power Supply Routing
- System Operation Descriptions
- Applicable Service Manual Sections
- Check for any Service Bulletins
Identify where to begin diagnosis based upon your knowledge of the system operation and the customer comments.
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STEP 4
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Inspect the system for mechanical binding, loose connectors or wiring damage. Determine which circuits and components are involved and diagnose using the Power Supply Routing and Harness Layouts.
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STEP 5
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Repair or replace the incident circuit or component.
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STEP 6
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Operate the system in all modes. Verify the system works properly under all conditions. Check you have not inadvertently created a new incident during your diagnosis or repair steps.
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