ECM/PCM monitors temperature changes of the IAT sensor. If ECM/PCM detects a erratic change of intake air temperature ECM/PCM determines that a fault exists and a DTC is stored.
Item | Detecting Condition | Possible Cause | |
DTC Strategy | Case 1 |
•
Out-of-range high | 1. Poor connection 2. IATS |
Case 2 |
•
Plausibility check / Monitor at cold condition | ||
Case 3 |
•
Electrical Check | ||
Case 4 |
•
Signal stuck check | ||
Enable Conditions | Case 1 |
•
(A)Vehicle speed > 31 mph
•
(B) 24 kg/h < Air mass flow < 160 kg/h
•
After (A) + (B) condition for 8 sec. | |
Case 2 |
•
Block heater : Not detected | ||
Case 3 |
•
- | ||
Case 4 |
•
[Vehicle speed < 3mph for 14 sec] ≥ 5 times & Air mass flow < 24 kg/h
•
[Vehicle speed > 37mph for 8 sec] ≥ 2 times & Air mass flow > 40 kg/h
•
ECT at cranking < 75 ℃ | ||
Threshold Value | Case 1 |
•
IAT > 110℃ | |
Case 2 |
•
Ref. temp - IAT(at cranking) > 20 ℃ | ||
Case 3 |
•
IAT sensor voltage - Intergrated sensor voltage > 0.5 V | ||
Case 4 |
•
Max. IAT - Min. IAT < 1.5 ℃ | ||
Diagnosis Time |
•
- | ||
MIL On Condition |
•
2 trips | ||
