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 # 1 - CHECKING FOR 12 VOLTS AT TERMINAL -AREGULAR METHOD
1990 Chevrolet Lumina APV V6-191 3.1L
Regular Method
1990 Chevrolet Lumina APV V6-191 3.1LSECTION Regular Method
TEST # 1 (Regular Method)
CHECK FOR 12 VOLTS TO TERMINAL -A- AT TRANSMISSION
^ Check for 12 volts to terminal A at the transmission.
^ Raise the vehicle on the lift so the driving wheels are off the ground.
^ Connect the alligator clip of your test light to ground. Unplug the wires at the case and place the tip of your test light on the terminal marked A.
^ Do not depress the brake pedal.
^ Computer controlled vehicles: turn on the ignition and the tester should light.
^ All other vehicles: start the engine and bring to normal operating temperature.
^ Raise RPM to 1500 and the tester should light. If tester lights continue with Regular Method.
^ If the tester does not light go to Test # 2.
CHECK FOR 12 VOLTS TO TERMINAL -A- AT TRANSMISSION
^ Check for 12 volts to terminal A at the transmission.
^ Raise the vehicle on the lift so the driving wheels are off the ground.
^ Connect the alligator clip of your test light to ground. Unplug the wires at the case and place the tip of your test light on the terminal marked A.
^ Do not depress the brake pedal.
^ Computer controlled vehicles: turn on the ignition and the tester should light.
^ All other vehicles: start the engine and bring to normal operating temperature.
^ Raise RPM to 1500 and the tester should light. If tester lights continue with Regular Method.
^ If the tester does not light go to Test # 2.
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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.