P009A-INTAKE AIR TEMP/ AMBIENT AIR TEMP PLAUSIBILITY
For a complete wiring diagram Refer to Section 8W
| Possible Causes |
| AAT SENSOR - COLD |
| AAT SENSOR - HOT |
| CHECKING CONNECTORS |
| IAT SENSOR - COLD |
| IAT SENSOR - HOT |
| INTERMITTENT CONDITION |
Diagnostic Test
1.CHECKING CONNECTORS
Is there any evidence of connector problems?
Yes
- Repair or replace as necessary.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
- Go To2
2.IAT SENSOR - COLD
NOTE: Allow the engine to completely cool to ambient temperature.
Are the readings within 7°C (13°F) of each other?
Yes
- Go To3
No
- Check the wiring and connectors associated with the IAT Sensor for corrosion, damage or other problems. Repair as necessary. If wiring and connectors are o.k., replace the Intake Air Temperature Sensor.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
3.AAT SENSOR - COLD
NOTE: Allow the engine to completely cool to ambient temperature.
Are the readings within 7°C (13°F) of each other?
Yes
- Go To4
No
- Check the wiring and connectors associated with the AAT Sensor for corrosion, damage or other problems. Repair as necessary. If wiring and connectors are o.k., replace the Ambient Air Temperature Sensor.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
4.IAT SENSOR - HOT
Are the readings within 7°C (13°F) of each other?
Yes
- Go To5
No
- Check the wiring and connectors associated with the IAT Sensor for corrosion, damage or other problems. Repair as necessary. If wiring and connectors are o.k., replace the Intake Air Temperature Sensor.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
5.AAT SENSOR - HOT
Is the Ambient Temperature Sensor reading correct outside temperature?
Yes
- Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
No
- Check the wiring and connectors associated with the AAT Sensor for corrosion, damage or other problems. Repair as necessary. If wiring and connectors are o.k., replace the Ambient Air Temperature Sensor.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).