Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1987BLAZER FULL SIZE V8-379 6.2L DSLREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTION
1987 Chevrolet Blazer Full Size V8-379 6.2L DSL
Computers and Control Systems: Testing and Inspection
1987 Chevrolet Blazer Full Size V8-379 6.2L DSLSECTION Testing and Inspection
1. Following a Flow of Diagnosis will usually lead to the correct test procedure and help repair the problem.
2. The Diagnostic Circuit Check under Computers and Control Systems/System Diagnosis/Procedures should ALWAYS be performed whether or not a computer related problem is suspected. The "Diagnostic Circuit Check" may reveal computer problems which were not originally suspected. Bypassing this test during diagnosis may lead to replacement of good parts.
3. If test procedures cannot fix the problem (or is not available), you can find additional component and system information in these areas:
^ A-Charts (System Testing) - may contain useful system descriptions, circuit description, wiring diagrams or diagnostic notes. Look here to see if the system you are working on has a related system test. You may perform these tests even if you have not been directed (unless otherwise noted).
^ C-Charts (Component Testing) - may contain useful component descriptions, circuit description, wiring diagrams or diagnostic notes. Look here to see if the component you are working on has a specific component test. You may perform these tests even if you have not been directed (unless otherwise noted).
^ Diagnostic Charts under Computers and Control Systems/System Diagnosis/Procedures - may be reviewed for diagnostic notes and circuit descriptions.
CAUTION:
- Trouble Code charts should Never be used to diagnose a component unless that trouble code has been stored.
- Using the trouble code chart without a stored trouble code may lead to incorrect diagnosis and replacement of good parts.
^ Diagnosis by Symptom - under Computers and Control Systems/System Diagnosis/Procedures should be used when no computer related problems appear. Refer to the related system (Computers and Control Systems, Fuel Control Systems, Ignition Control System, etc.).
^ System or Component Descriptions - Sometimes getting a better idea of HOW the system or component works can help with diagnosis of a problem.
2. The Diagnostic Circuit Check under Computers and Control Systems/System Diagnosis/Procedures should ALWAYS be performed whether or not a computer related problem is suspected. The "Diagnostic Circuit Check" may reveal computer problems which were not originally suspected. Bypassing this test during diagnosis may lead to replacement of good parts.
3. If test procedures cannot fix the problem (or is not available), you can find additional component and system information in these areas:
^ A-Charts (System Testing) - may contain useful system descriptions, circuit description, wiring diagrams or diagnostic notes. Look here to see if the system you are working on has a related system test. You may perform these tests even if you have not been directed (unless otherwise noted).
^ C-Charts (Component Testing) - may contain useful component descriptions, circuit description, wiring diagrams or diagnostic notes. Look here to see if the component you are working on has a specific component test. You may perform these tests even if you have not been directed (unless otherwise noted).
^ Diagnostic Charts under Computers and Control Systems/System Diagnosis/Procedures - may be reviewed for diagnostic notes and circuit descriptions.
CAUTION:
- Trouble Code charts should Never be used to diagnose a component unless that trouble code has been stored.
- Using the trouble code chart without a stored trouble code may lead to incorrect diagnosis and replacement of good parts.
^ Diagnosis by Symptom - under Computers and Control Systems/System Diagnosis/Procedures should be used when no computer related problems appear. Refer to the related system (Computers and Control Systems, Fuel Control Systems, Ignition Control System, etc.).
^ System or Component Descriptions - Sometimes getting a better idea of HOW the system or component works can help with diagnosis of a problem.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.