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.
Component Description: Pcm/TCM
The PCM/TCM is located behind glove box on all vehicles except "G" Series. On "G" Series, PCM/TCM is under driver's seat. PCM/TCM controls TCC, force motor (hydraulic pressure) and shifting solenoids "A" and "B". In addition, PCM also controls ignition, fuel and emission devices related to the engine.
The PCM/TCM receives electronic signals from sensors and switches. These signals help the PCM/TCM determine when to operate various relays and solenoids related to engine and transmission components.
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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.