08/09/21
Message Overview:
Message Description:
Both channels of the PACK DISCHARGE TEMPERATURE SENSOR are detected failed. Check for sensor failure.
Possible Causes:
- Pack Discharge Temperature Sensor (MT33)
- Integrated Air System Controller (IASC) (A55)
- 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 |
| Operational Test of the Integrated Air System (IAS) Controller | AMM 21-31-01-710-801 |
| Removal of the Pack Discharge Temperature-Sensor | AMM 21-52-37-000-801 |
| Installation of the Pack Discharge Temperature-Sensor | AMM 21-52-37-400-801 |
| Standard Practices - Wire Repair | SPM 20-12-10-02 |
Troubleshooting Recommendations:
- Disconnect connector MT33P1 (PDTS). Check continuity between pins 1 to 3 and 4 to 5 on the Pack Discharge Temp Sensor. Ref chart for resistance values.
- Reconnect MT33P1 and gain access to IASC #1.
- Disconnect A55P1 and check resistance between pins 51 and 68. Compare to readings recorded between pins 1 and 3 of step 1. If resistance is substantially higher verify wiring between the IASC #1 and PDTS.
- Disconnect A55P3 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 #1 and PDTS IAW AWM 21-52-17.
- If the PDTS is checking normal and fault still exists, recommend swapping IASCs for further troubleshooting.
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