Hummer H2. Manual - part 1920

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2002-04 GENERAL INFORMATION

Strategy Based Diagnosis 

STRATEGY BASED DIAGNOSIS 

The goal of Strategy Based Diagnostics 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 Diagnostics 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, verify the Customer Concern box . The final step of 
your diagnostic process should be Repair and verify the Fix box 7. Refer to the following chart for the correct 
Strategy Based Diagnostics. 

 

2004 Hummer H2 

2002-04 GENERAL INFORMATION Strategy Based Diagnosis

  

 

2004 Hummer H2 

2002-04 GENERAL INFORMATION Strategy Based Diagnosis

  

Fig. 1: Strategy Based Diagnosis 

1. Verify the Customer 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 

 

2004 Hummer H2 

2002-04 GENERAL INFORMATION Strategy Based Diagnosis

  

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.  

2. 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.  

3. Perform Published Diagnostic System Checks: One or more DTCs may not support a system. System 

checks verify the proper operation of the system. This will lead the technician in an organized approach to 
diagnostics.  

4. Check Bulletins and Other Service Information: Use videos, newsletters, and the Pulsat programs.  

5.

5.1 Stored DTCs: Follow the designated DTC table exactly in order to make an effective repair.  

5.2 Symptom No DTC: Select the symptom from the symptom tables. Follow the diagnostic steps 
or suggestions in order to complete the repair, or refer to the applicable component/system check.  

5.3 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, road salt or other corrosives battery acid, oil or other fluids. Utilize the 
wiring diagrams, system description and operation, and system circuit description.  

5.4 Intermittents: An intermittent condition is one that does not occur continuously and will occur 
when certain conditions are met. Generally, intermittents are caused by faulty electrical connections 
and wiring, malfunctioning components, electromagnetic/radio frequency interference, and 
aftermarket equipment. Combine technician knowledge with efficient use of the available service 
information. Evaluate the symptoms and conditions described by the customer. Use a check sheet 
or other method in order to identify the component. Follow the suggestions for intermittent 
diagnosis found in the service manual. The Tech 1 and Tech 2 scan tools, and the J 39200 (Fluke 
87) have data capturing capabilities that can assist in detection of intermittents.  

5.5 Vehicle Operates as Designed: This condition exists when the vehicle is found to operate 
normally. The condition described by the customer may be normal. Verify against another like 
vehicle that is operating normally under the same conditions described by the customer. Explain 
your findings and the operation of that system to the customer.  

6. 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.  

7. Repair and Verify Fix: After isolating the cause, make the repairs and validate for proper operation. 

Verify that the symptom has been corrected, which may involve road testing the vehicle. 

 

2004 Hummer H2 

2002-04 GENERAL INFORMATION Strategy Based Diagnosis