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.
Shift Control Mechanism
To perform hydraulic control, shift control, and lock-up control of the automatic transmission, the PCM controls shift solenoid valves A, B, and C, line pressure solenoid valve A, and automatic transmission (A/T) clutch pressure control solenoid valves A, B, C, and D. The PCM switches each shift solenoid valve ON and OFF. This changes the positions of the shift valves in the valve bodies which open and close ports to send hydraulic pressure to the appropriate clutch. A/T clutch pressure control solenoid valves A, B, C, and D control the clutch pressure regulated by each of them, which allows smooth shifts and lock-up of the torque converter.
Use the Manual With the Right Hardware
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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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