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 MANUALSCHEVROLET1993LUMINA APV V6-3800 3.8LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONSCAN TOOL TESTING AND PROCEDURES
1993 Chevrolet Lumina APV V6-3800 3.8L
Scan Tool Testing and Procedures
1993 Chevrolet Lumina APV V6-3800 3.8LSECTION Scan Tool Testing and Procedures
Typical Tech 1 Data Values:
Typical Tech 1 Data Values:
If after completing the FLOW OF DIAGNOSIS and finding the Tech 1 diagnostics functioning properly and no diagnostic trouble codes displayed, the "Typical Scan Values" may be used for comparison with values obtained on the vehicle being diagnosed. The "Typical Scan Values," are average display values recorded from normally operating vehicles and are intended to represent what a normally functioning system would display.
A SCAN TOOL THAT DISPLAYS FAULTY DATA SHOULD NOT BE USED, AND THE PROBLEM SHOULD BE REPORTED TO THE MANUFACTURER. THE USE OF A FAULTY SCAN CAN RESULT IN MISDIAGNOSIS AND UNNECESSARY PARTS REPLACEMENT.
Only the parameters listed below are used for diagnosing. If a scan reads other parameters, the values are not recommended by General Motors for use in diagnosing. For more description on the values and use of the Tech 1 to diagnose PCM inputs, refer to the applicable diagnosis section in "Component Testing". If all values are within the range illustrated, Testing and Inspection
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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.