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.
EGR Temperature Sensor
The EGR temperature sensor detects temperature changes in the EGR passageway. When the cooling efficiency of EGR cooler is extremely deteriorated, exhaust gas is not cooled than expected, and the temperature in the passageway changes. The EGR temperature sensor is a thermistor that modifies a voltage signal sent from the ECM. This modified signal then returns to the ECM as an input signal. As the temperature increases, EGR temperature sensor resistance decreases.
This sensor is not directly used to control the engine system. It is used only for the fail safe.
<Reference data>
| EGR Temperature [°C (°F)] |
Voltage* (V) |
Resistance (MΩ) |
|---|---|---|
| 0 (32) | 4.87 | 0.62 - 1.05 |
| 50 (122) | 4.54 | 0.065 - 0.094 |
| 100 (212) | 2.88 | 0.011 - 0.015 |
*: These data are reference values and are measured between ECM terminals.
NO RELATED
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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.