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.
Chart C-8A, Torque Converter Clutch Functional Check - 1992 3.8L PFI (VIN 1): Notes
When solenoid coil is activated, TCC is applied which results in a straight through mechanical coupling from engine to wheels. When solenoid coil is deactivated, TCC is released which allows torque converter to operate in conventional manner. PWN solenoid varies hydraulic pressure to make locking and unlocking of TCC smoother. TCC will engage under the following conditions:
- Engine is warmed up.
- Vehicle speed above a calibrated value of about 28 MPH.
- Throttle position not changing, indicating a steady speed.
- Brake switch is closed.NOTE: Test numbers refer to test numbers on diagnostic chart.
- This test determines whether fault is caused by a bad solenoid or control circuit.
- This test checks availability of voltage on circuit No. 420.
- This test checks PCM's capability to pulse PWM solenoid on and off.
- Electrical circuits have checked out okay. Refer to appropriate AUTO TRANS DIAGNOSIS article for hydraulic and mechanical diagnosis.
NO RELATED
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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.