Strategy Based Diagnosis
The goal of Strategy Based Diagnosis is to provide guidance when
you create a plan of action for each specific diagnostic situation.
Following a similar plan for each diagnostic situation, you will
achieve maximum efficiency when you diagnose and repair vehicles.
Although each of the Strategy Based Diagnosis boxes is numbered,
you are not required to complete every box in order to successfully
diagnose a customer concern. The first step of your diagnostic
process should always be Understand and Verify the Customer's
Concern. The final step of your diagnostic process should be Repair
and verify the Fix. Refer to the following chart for the correct
Strategy Based Diagnosis.
- Understand and Verify the Customer's Concern: The
first part of this step is to obtain as much information as
possible from the customer. Are there aftermarket accessories on
the vehicle? When does the condition occur? Where does the
condition occur? How long does the condition last? How often does
the condition occur? In order to verify the concern, the technician
should be familiar with the normal operation of the system and
refer to the owner or service manual for any information
needed.
- Vehicle Operating as Designed: This condition exists
when the vehicle is found to operate normally. The condition
described by the customer may be normal. Compare with another like
vehicle that is operating normally under the same conditions
described by the customer. Explain your findings and the operation
of the system to the customer. If the customer is dissatisfied
submit a Field Product Report.
- Preliminary Checks: Conduct a thorough visual
inspection. Review the service history. Detect unusual sounds or
odors. Gather diagnostic trouble code (DTC) information in order to
achieve an effective repair.
- Perform Published Diagnostic System Check- Vehicle:
The verifies the proper operation of the system. This will
lead the technician in an organized approach to diagnostics and
identify what category of diagnostic to perform.
- Check for related Bulletins, Recalls and Preliminary
Information (PI).
- Diagnostic categories:
6.1. |
Current DTC: Follow the designated DTC diagnostic
in order to make an effective repair. Refer to
Diagnostic Trouble Code (DTC) List - Vehicle
:
→ → Insignia 2010 → Insignia 2009 →
. |
6.2. |
Symptom - No DTC: Select the appropriate symptom
diagnostic. Follow the diagnostic steps or suggestions in order to
complete the repair. Refer to
Symptoms - Vehicle
:
→ → Insignia 2010 → Insignia 2009 →
. |
6.3. |
No Published Diagnostics: Analyze the Concern.
Develop a plan for the diagnostics. The service manual schematics
will help you to see system power, ground, input, and output
circuits. You can also identify splices and other areas where
multiple circuits are tied together. Look at component locations to
see if components, connectors or harnesses may be exposed to
extreme temperature, moisture, or corrosives (road salt, battery
acid, oil or other fluids). Utilize the wiring diagrams, system
description and operation, and system circuit description. |
6.4. |
Intermittent/History DTC: An intermittent
condition is one that does not occur continuously, may be difficult
to duplicate, and will only occur when certain conditions are met.
Generally, an intermittent is caused by faulty electrical
connections and wiring, malfunctioning components,
electromagnetic/radio frequency interference, driving conditions,
or aftermarket equipment. The following approaches/tools may prove
to be beneficial in locating and repairing an intermittent
condition or history DTC. |
•
|
Combining technicians knowledge with the available
service information. |
•
|
Evaluate the symptoms and conditions described by
the customer on the
Customer Concern Verification Sheets
:
→ → Insignia 2010 → Insignia 2009 →
. |
•
|
Use the available scan tool, digital multi-meter,
or J 42598 with data capturing capabilities. |
- Isolate the Root Cause then Repair and Verify Fix:
After isolating the root cause, make the repairs and validate for
the correct operation by performing the Diagnostic Repair Verification .
Verifying that the DTC or symptom has been corrected may involve
road testing the vehicle.
- Re-examine the Concern: If a technician cannot
successfully find or isolate the concern, a re-evaluation is
necessary. Re-verify the concern. The concern could be an
intermittent or normal condition.
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