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 Control Unit (Ecu)
The ECU controls all functions of the TCCS. The ECU receives signals from the data sensors and switches. Signals are processed by the ECU for controlling the Electronic Fuel Injection (EFI), Electronic Spark Advance (ESA), Idle Speed Control (ISC), Electronic Controlled Transmission (ECT) and EGR systems.
The ECU contains a fail-safe function used in case of a data sensor or switch failure. This function provides a back-up system to provide minimal driveability. The "CHECK ENGINE" light will also be activated during this function.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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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