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.
Input/Output Signal Chart
| Sensor | Input Signal to ECM | ECM function | Actuator | |
|---|---|---|---|---|
| Crankshaft position sensor (POS) | Engine speed* | Air conditioner cut control |
IPDM E/R ↓ Air conditioner relay ↓ Compressor |
|
| Camshaft position sensor (PHASE) | ||||
| Engine coolant temperature sensor | Engine coolant temperature | |||
| Accelerator pedal position sensor | Accelerator pedal position | |||
| Battery | Battery voltage* | |||
| Refrigerant pressure sensor | Refrigerant pressure | |||
| EPS control unit | CAN communication | EPS operation signal | ||
| Combination meter | CAN communication | Vehicle speed signal | ||
| BCM | CAN communication |
|
||
* : ECM determines the start signal status by the signals of engine speed and battery voltage.
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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