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.
Lock-Up System: Notes
The lock-up mechanism operates in D (during accelerating: 1st, 2nd, 3rd, 4th, 5th, and 6th gears/during decelerating: 2nd, 3rd, 4th, 5th, and 6th gears), S with automatic shift mode (during accelerating: 1st, 2nd; 3rd, 4th, and 5th gears/during decelerating: 2nd, 3rd, 4th, and 5th gears), and S with sequential sportshift mode (during accelerating: 1st, 2nd, 3rd, 4th, 5th, and 6th gears/during decelerating: 2nd, 3rd, 4th, 5th, and 6th gears). The pressurized fluid is supplied through a lock-up fluid passage in the torque converter, causing the lock-up clutch in the torque converter to be engaged. As this takes place, the mainshaft rotates at the same speed as the engine crankshaft. The PCM controls the shift solenoid valve C pressure and A/T clutch pressure control solenoid valve D pressure to optimize the lock-up timing and the amount of the lock-up. The shift solenoid C pressure operates the lock-up shift valve to switch the lock-up ON and OFF. The A/T clutch pressure control solenoid valve D pressure operates the lock-up control valve to control the degree of lock-up.
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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.
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