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.
Torque Converter Clutch
The Powertrain Control Module (PCM) uses signals from the Vehicle Speed Sensor (VSS) to detect Torque Converter Clutch (TCC) lock-up status. The PCM then compares the actual data with the TCC lock-up schedule in the PCM memory to detect mechanical trouble of the TCC solenoid and valve body.
The TCC solenoid is used to engage the lock-up clutch. The PCM outputs system voltage to turn ON (energize) or remove voltage to turn OFF (de-energize) to control the hydraulic pressure to the lock-up valve within the transaxle. The TCC solenoid is always OFF in 1st and 2nd gears. The TCC is ON in 3rd and 4th gears when the PCM deems it appropriate.
If the brake light switch is closed, the PCM will not allow the TCC lock-up to occur. The PCM also uses the brake light switch input for fuel cut-off control.
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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.