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 -DQUICK METHOD
1990 Chevrolet Lumina APV V6-191 3.1L
Quick Method
1990 Chevrolet Lumina APV V6-191 3.1LSECTION Quick Method
TEST # 6 (ALDL Quick Method)
CHECK FOR GROUND AT TERMINAL -D- AT THE TRANSMISSION
Note
First you must have passed ALDL Quick method (Test # 1. Otherwise continue with regular method (Test # 6).
The test light should still be connected between terminal A and F at the ALDL.
With the engine at normal operating temperature, go for a road test.
As you start your road test the tester should be lit.
Note
if your foot is on the brake the light will be out.
Watch the test light to see if it goes out at some point during the road test.
If the test light goes out, you have ground at terminal D at the transmission. Go to test # 7.
If the test light stays on you have a computer system problem. (See test # 13) Go test # 7.
CHECK FOR GROUND AT TERMINAL -D- AT THE TRANSMISSION
Note
First you must have passed ALDL Quick method (Test # 1. Otherwise continue with regular method (Test # 6).
The test light should still be connected between terminal A and F at the ALDL.
With the engine at normal operating temperature, go for a road test.
As you start your road test the tester should be lit.
Note
if your foot is on the brake the light will be out.
Watch the test light to see if it goes out at some point during the road test.
If the test light goes out, you have ground at terminal D at the transmission. Go to test # 7.
If the test light stays on you have a computer system problem. (See test # 13) Go test # 7.
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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.