| Main Action |
- Sensor plausibility check
|
- Poor Connector Connection
- Faulty IAT sensor
|
| Case 1 |
Prerequisite condition |
- Engine speed is higher than 450 RPM
- Battery voltage is between 10V and 16V
- Engine coolant temperature (ECT) is higher than 56°C (132.8°F)
- Elapsed time since engine stops is longer than 10 minutes
- Difference between minimum and maximum amount of heat stored in intake manifold is greater than 1000
|
| Threshold Value |
Signal stuck
- Signal variation of IAT since engine starts is lower than 0.258°C (32.5°F)
|
| Diagnosis Time |
|
| Case 2 |
Prerequisite condition |
- Battery voltage is between 10V and 16V
|
| Threshold Value |
Noisy signal
- Absolute value of difference between IAT and mean value of IAT movement is higher than 8.25°C (46.9°F)
|
| Diagnosis Time |
- Continuously (for 1 second by repeated 100 msec)
|
| Case 2 |
Prerequisite Condition |
- Battery voltage is between 10V and 16V
- Elapsed time since engine stops is longer than 360 minutes
- ECT drop in 15 seconds after starting is less than or equals to 1.4°C (34.5°F)
|
| Threshold value |
- Value of difference between IAT and AAT is greater than 25°C (77°F) or value of difference between IAT and ECT is greater than 20°C (68°F)
- Value of difference among other temperature sensors (ECT and AAT) is lower than or equals to 25°C (77°F)
|
| Diagnosis Time |
|
| MIL On Condition |
|