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.
With Smart Key System:: Communications
The ECM communicates with the following ECU using the signals listed below. The following table explains receiving and sending signals by the ECM or ECU.
| Transmitter | Receiver | Signal | Communication Line |
|---|---|---|---|
| ECM | Front Controller | Radiator cooling fan control signal | CAN --> BEAN |
| ECM | A/C ECU | A/C control signal (compressor control for turning off) | CAN --> BEAN |
| ECM | A/C ECU | A/C and engine co-operation control signal (compressor control for deceleration) | CAN --> BEAN |
| A/C ECU | ECM | Idle up request signal | BEAN --> CAN |
| Skid control ECU | ECM | Throttle closing request signal | CAN |
| Skid control ECU | ECM | Ignition retard angle request signal | CAN |
| Skid control ECU | ECM | Engine torque reduction request signal | CAN |
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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