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 MANUALSCHEVROLET1990LUMINA APV V6-191 3.1LREPAIR AND DIAGNOSISTECHNICAL SERVICE BULLETINSALL TECHNICAL SERVICE BULLETINSA/T - DIAGNOSING CONVERTER LOCK-UP PROBLEMSTEST # 6 - CHECKING FOR GROUND AT TERMINAL -DREGULAR METHOD
1990 Chevrolet Lumina APV V6-191 3.1L
Regular Method
1990 Chevrolet Lumina APV V6-191 3.1LSECTION Regular Method
TEST # 6 (Regular Method)
CHECK FOR GROUND AT TERMINAL -D- AT THE TRANSMISSION
^ Check for ground at terminal D at the transmission.
^ On Non-computer-controlled vehicles skip this test and go directly to cooler line pressure, or surge test.
^ Raise the vehicle on the lift so the driving wheels are off the ground.
^ Unplug the wires at the case and connect the alligator clip of your test light to terminal A.
^ Place the tip of your test light on terminal D.
^ Start the engine and bring to normal operating temperature.
^ Place the selector in Drive. (O.D. on four speed units).
^ Accelerate slowly to 60 mph and the tester should light.
^ If the tester does not light you have a computer system problem. Go to test # 7 (Regular Method).
CHECK FOR GROUND AT TERMINAL -D- AT THE TRANSMISSION
^ Check for ground at terminal D at the transmission.
^ On Non-computer-controlled vehicles skip this test and go directly to cooler line pressure, or surge test.
^ Raise the vehicle on the lift so the driving wheels are off the ground.
^ Unplug the wires at the case and connect the alligator clip of your test light to terminal A.
^ Place the tip of your test light on terminal D.
^ Start the engine and bring to normal operating temperature.
^ Place the selector in Drive. (O.D. on four speed units).
^ Accelerate slowly to 60 mph and the tester should light.
^ If the tester does not light you have a computer system problem. Go to test # 7 (Regular Method).
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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.