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 MANUALSCHEVROLET1991S10/T10 P/U 4WD V6-262 4.3LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSENGINE CONTROL MODULETESTING AND INSPECTIONINITIAL INSPECTION AND DIAGNOSTIC OVERVIEW
1991 Chevrolet S10/T10 P/U 4WD V6-262 4.3L
Initial Inspection and Diagnostic Overview
1991 Chevrolet S10/T10 P/U 4WD V6-262 4.3LSECTION Initial Inspection and Diagnostic Overview
A technician may request the ECU to perform a function test by grounding ALDL terminal H to A once for 2 seconds. This will activate the motor and the valves. The ignition must be cycled after each attempt to prevent a false code from being set.
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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.