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.
Electronic Hydraulic Control System: General
The electronic hydraulic control system for transmission and transfer consists of various sensors, switches, TCM and control valve containing solenoid valves. This system controls shifting, lock-up clutch operation, line pressure and automatic transmission operation including shift timing. This also controls transfer clutch operation. TCM judges vehicle driving status based on various types of input signals and controls a total of eight solenoids (front brake solenoid, forward brake solenoid, input clutch solenoid, high&low reverse clutch solenoid, direct clutch solenoid, lock-up solenoid, line pressure solenoid and transfer solenoid) by sending appropriate signals.
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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.