02/02/21
Message Overview:
Message Description:
Both channels of the CABIN DUCT TEMPERATURE SENSOR are detected failed. Check for the sensor failure.
Possible Causes:
- Cabin Duct Temperature Sensor (MT26)
- Associated Wiring
Troubleshooting Tips:
Advisory Wire/Service Bulletin: None
Forum Articles/Infoservice/Newsletter: None
Quick Links:
| Removal of the Integrated Air System (IAS) Controller | AMM 21-31-01-000-801 |
| Installation of the Integrated Air System (IAS) Controller | AMM 21-31-01-400-801 |
| Removal of the Cabin Duct Temperature-Sensor | AMM 21-61-13-000-801 |
| Installation of the Cabin Duct Temperature-Sensor | AMM 21-61-13-400-801 |
| Standard Practices - Replace Wiring | SPM 20-12-00-02 |
| Standard Practices - Continuity Test | SPM 20-12-01-05 |
| Standard Practices - Repair Wiring | SPM 20-12-10-02 |
Troubleshooting Recommendations:
- Disconnect connector MT26P1. Check continuity between pins 1 to 3 and 4 to 5 on theCabin Duct Temp Sensor. Ref chart below for resistance values. Replace sensor if out of range.
- Reconnect MT26P1 and gain access to IASC #2.
- Disconnect A56P1 and check resistance between pins 1 and 2. Compare to readings recorded between pins 1 and 3 of step 1. If resistance is substantially higher verify wiring between the IASC #2 and Duct Temp Sensor.
- Disconnect A56P3 and check resistance between pins 4 and 5. Compare to readings recorded between pins 4 and 5 of step 1. If resistance is substantially higher verify wiring between the IASC #2 and Duct Temp Sensor.
- If the Cabin Duct Temp Sensor and all wiring appears good recommend swapping IASCs for further troubleshooting.
Contact Field Service for any additional support required.
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