IATS (Intake Air Temperature Sensor) is intergrated in MAF sensor.
This part employs a thermistor (NTC) which is sensitive to changes in temperature.
The electric resistance of a thermistor decreases as the temperature increases, and increases as the temperature decreases.
The power source in the ECM is supplied to the IATS via a resistor in the ECM.
The ECM judges intake air temperature by the sensor output voltage and is used for injection quantity correction, injection time correction, starting fuel quantity correction as a compensation signal.
If the signal is above threshold value, the ECM judged this as a fault and DTC is set.
Item | Detecting Condition | Possible Cause |
DTC Strategy | ● Signal check, high | ● Short to ground in signal circuit ● Open in signal circuit ● Open in ground circuit ● Faulty IATS ● Faulty ECM |
Enable Conditions | ● Ignition on | |
Threshold Value | ● Output signal > 4.9V | |
Diagnostic Time | ● 2 sec. | |
MIL Fuel Limit Fuel Cut EGR Off | ● No ● No ● No ● Yes | |
Fail safe | ● Engine air temperature is fixed at value of 60°C by ECM |
IATS | |||
Temperature (°C) | 20 | 40 | 60 |
Resistance (kΩ) | 2.29 ~ 2.55 | 1.1 ~ 1.2 | 0.56 ~ 0.65 |
