DTC P0127
Precautions: General safety (00)
DTC Detecting Condition and Trouble Area
| DTC detection condition | Trouble area |
|---|---|
|
P0127: Intake Air Temperature Too High Measured IAT-1 is higher than specified value. (1 D/C detection logic) |
•IAT sensor-1 and/or its circuit
•Engine cooling system •Engine oil insufficient •Air intake system •ECM |
Circuit Diagram
| [A]: | ECM connector (View: [a]) | A3: | MAF sensor ground circuit | 2. | MAF sensor |
| A1: | MAF sensor power supply circuit | B1: | IAT sensor-1 signal circuit | 3. | IAT sensor-1 |
| A2: | MAF sensor signal circuit | 1. | ECM |
DTC Troubleshooting
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
Was “Engine and Emission Control System Check” performed?
|
Go to Step 2.
|
|
| 2 |
IAT sensor-1 signal circuit and MAF sensor ground check
1)Check “B1” and “A3” circuits according to Step 2 of IAT Sensor-1 Check:D16AA.
Is check result OK?
|
Go to Step 3.
|
Repair or replace defective wire harness.
|
| 3 |
IAT sensor-1 check
1)Check IAT sensor-1.
Is check result OK?
|
Go to Step 4.
|
Replace MAF sensor with IAT sensor-1.
|
| 4 |
Cooling system check
1)Check cooling system.
•Coolant level:
•Engine cooling system: Is check result OK?
|
Go to Step 5.
|
Repair or replace defective part(s).
|
| 5 |
Engine lubrication system check
1)Check that there is no engine oil leakage and engine oil level is correct.
Is check result OK?
|
Go to Step 6.
|
Repair or replace defective part(s).
|
| 6 |
Air intake system check
1)Check that air intake system is working properly.
Is check result OK?
|
Replace ECM and recheck DTC.
|
Repair or replace defective part(s).
|