GDI Exhaust Temp Sensor Testing

GDI Exhaust Temperature Sensor Testing

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Most GDI Exhaust Temperature Sensors have two terminals. It is important to remember that this sensor is connected in series with an E C M internal resistor. The ECM microprocessor takes the actual signal at the middle of the voltage divider network or between the sensor and internal resistor. This is important to know for two reasons.

One, if the sensor is disconnected and the signal wire is probed, you should see 5 volts, like any other sensor. But, if a load, such as another resistor or a test light is used to drop the voltage down and no change is seen, it means the ECM internal resistor is shorted, and the ECM should be replaced.

On this sensor, the ECM provides 5 volts, through the internal resistor. Don't worry about shorting this circuit to ground, the 5 volt reference voltage regulator is protected internally. Do not use a power probe on any computer circuit, however, contrary to what most theoretical instructors say, a test light is fine to be used with this circuit, if connected to ground. The test light bulb actually works like a resistor. If an instructor ever says not to ....

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