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.
TCC Check
The Torque Converter Clutch (TCC) eliminates power loss during highway cruise conditions. An ECM controlled solenoid in the transmission activates the TCC.
Ignition power is supplied to the solenoid through a brake switch which opens when the brake is applied. The ECM completes the ground to activate the TCC solenoid for clutch engagement.
- Checks for complete circuit from ignition through solenoid to the test point.
- Checks that the ECM is completing the circuit to ground to engage the TCC.
- Checks for TPS signal to ECM.
- Checks ground circuit to ECM terminal "A2".
- Checks for ignition voltage to terminal "A" of the TCC harness connector.
- Checks for complete circuit from ignition to ground via TCC test terminal in ALCL.
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.