W DOC AIRBUS | TSM A320F

Loss of the T3 Thermocouple Signal - Engine 2 - Channel A

TASK 77-20-00-810-810-A
Loss of the T3 Thermocouple Signal - Engine 2 - Channel A

1. Possible Causes
  • T3 thermocouple
  • CJ13 harness
  • J13 harness
  • ECU [4000KS]
  • HJ13 harness
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 73-21-50-000-005
Removal of the CJ13 Harness
AMM 73-21-50-000-012
Removal of the J13 Harness
AMM 73-21-50-000-029
Removal of the CJ13 Harness
AMM 73-21-50-000-046
Removal of the HJ13 Harness for SAC Engines
AMM 73-21-50-210-001
Visual Inspection of the Wiring Harness
AMM 73-21-50-210-002
Visual Inspection of the Wiring Harnesses
AMM 73-21-50-400-005
Installation of the CJ13 Harness
AMM 73-21-50-400-012
Installation of the J13 Harness
AMM 73-21-50-400-029
Installation of the CJ13 Harness
AMM 73-21-50-400-046
Installation of the HJ13 Harness for SAC Engines
AMM 73-21-60-000-001
Removal of the Electronic Control Unit (ECU)
AMM 73-21-60-400-001
Installation of the Electronic Control Unit (ECU)
AMM 73-29-00-710-040
Operational Test of the FADEC on the ground (with Engine Motoring)
AMM 77-23-10-000-001
Removal of the Compressor Discharge Temperature (T3) Sensor
AMM 77-23-10-000-002
Removal of the Compressor Discharge Temperature (T3) Sensor
AMM 77-23-10-400-001
Installation of the Compressor Discharge Temperature (T3) Sensor
AMM 77-23-10-400-002
Installation of the Compressor Discharge Temperature (T3) Sensor
3. Fault Confirmation
Subtask 77-20-00-710-068-A ** ON A/C NOT FOR ALL
A. Test
   (1) Do the operational test of the FADEC 2A on the ground (with engine non motoring) AMM 73-29-00-710-040.
Subtask 77-20-00-710-068-B ** ON A/C NOT FOR ALL
A. Test
   (1) Do the operational test of the FADEC 2A on the ground (with engine non motoring) AMM 73-29-00-710-040.
4. Fault Isolation
Subtask 77-20-00-810-059-A ** ON A/C NOT FOR ALL
A. The failure message is generated if channel A sensor signal is invalid or out of range.
NOTE: If T3 sensor Part Number is 1348M21P01, P04 or P05, replace T3 sensor AMM 77-23-10-000-001 and AMM 77-23-10-400-001.
   (1) If the failure message T3 SENS, J13, ECU is not confirmed:
  • no maintenance action is required.
   (2) If the failure message T3 SENS, J13, ECU is not confirmed, but is repetitive:
  • visually examine the T3 thermocouple receptacle and the CJ13 harness connector for damaged pins and contamination AMM 73-21-50-210-001.
     (a) If harness connector or T3 thermocouple receptacle is damaged:
  • repair or replace as required.
     (b) If no damage is found:
  • visually examine the ECU (4000KS) receptacle and the J13 harness connector for damaged pins and contamination AMM 73-21-50-210-001.
       1 If harness connector or ECU receptacle is damaged:
  • repair or replace as required.
       2 If no damage is found:
     (c) If the fault continues during the subsequent flights:
     (d) If the fault continues during the subsequent flights:
     (e) If the fault continues during the subsequent flights:
   (3) If the failure message T3 SENS, J13, ECU is confirmed:
  • disconnect the two CJ13 connectors from the T3 thermocouple
  • visually examine the T3 thermocouple receptacle and the CJ13 harness connectors for damaged pins and contamination AMM 73-21-50-210-001.
     (a) If harness connectors or T3 thermocouple receptacle are damaged:
  • repair or replace as required.
     (b) If no damage is found:
  • do a resistance check of the two T3 thermocouple connectors between:
    . pins A and B (0.5 to 10 ohms)
    . pin A and the ground (> 10 megohms).
       1 If the resistance values of one of the two T3 thermocouple connectors are out of specified limits:
       2 If the resistance values are in the specified limits:
  • reconnect the CJ13 harness to the T3 thermocouple
  • disconnect the J13 harness from the ECU
  • visually examine the ECU (4000KS) receptacle and the J13 harness connector for damaged pins and contamination AMM 73-21-50-210-001.
         a If harness connector or ECU receptacle is damaged:
  • repair or replace as required.
         b If no damage is found:
  • do an electrical resistance test through the J13 harness between:
    . pins 4 and 5 (0.5 to 10 ohms)
    . pins 14 and 15 (0.5 to 10 ohms)
    . pins 4 and 16 (> 10 megohms)
    . pins 14 and 16 (> 10 megohms)
    . pin 4 and the ground (> 10 megohms)
    . pin 14 and the ground (> 10 megohms).
         c If the resistance values are in the specified limits:
         d If the resistance values are out of the specified limits:
  • reconnect the J13 harness
  • disconnect the J13 harness from the CJ13 harness at the 6 o'clock junction box
  • do an electrical resistance test through the CJ13 harness between:
    . pins 7 and 8 (0.5 to 10 ohms)
    . pins 1 and 10 (0.5 to 10 ohms)
    . pins 7 and 9 (> 10 megohms)
    . pins 1 and 9 (> 10 megohms)
    . pin 7 and the ground (> 10 megohms)
    . pin 1 and the ground (> 10 megohms).
         e If the resistance values are out of the specified limits:
         f If the resistance values are in the specified limits:
Subtask 77-20-00-810-059-B ** ON A/C NOT FOR ALL
A. The failure message is generated if channel A sensor signal is invalid or out of range.
NOTE: If T3 sensor Part Number is 1348M21P01, P04 or P05, replace T3 sensor AMM 77-23-10-000-001 and AMM 77-23-10-400-001.
   (1) If the failure message T3 SNSR, J13, ECU is not confirmed:
  • no maintenance action is required.
   (2) If the failure message T3 SNSR, J13, ECU is not confirmed, but is repetitive:
  • visually examine the T3 thermocouple receptacle and the CJ13 harness connector for damaged pins and contamination AMM 73-21-50-210-001.
     (a) If harness connector or T3 thermocouple receptacle is damaged:
  • repair or replace as required.
     (b) If no damage is found:
  • visually examine the ECU (4000KS) receptacle and the J13 harness connector for damaged pins and contamination AMM 73-21-50-210-001.
       1 If harness connector or ECU receptacle is damaged:
  • repair or replace as required.
       2 If no damage is found:
     (c) If the fault continues during the subsequent flights:
     (d) If the fault continues during the subsequent flights:
     (e) If the fault continues during the subsequent flights:
   (3) If the failure message T3 SNSR, J13, ECU is confirmed:
  • disconnect the two CJ13 connectors from the T3 thermocouple
  • visually examine the T3 thermocouple receptacle and the CJ13 harness connectors for damaged pins and contamination AMM 73-21-50-210-001.
     (a) If harness connectors or T3 thermocouple receptacle are damaged:
  • repair or replace as required.
     (b) If no damage is found:
  • do a resistance check of the two T3 thermocouple connectors between:
    . pins A and B (0.5 to 10 ohms)
    . pin A and the ground (> 10 megohms).
       1 If the resistance values of one of the two T3 thermocouple connectors are out of specified limits:
       2 If the resistance values are in the specified limits:
  • reconnect the CJ13 harness to the T3 thermocouple
  • disconnect the J13 harness from the ECU
  • visually examine the ECU (4000KS) receptacle and the J13 harness connector for damaged pins and contamination AMM 73-21-50-210-001.
         a If harness connector or ECU receptacle is damaged:
  • repair or replace as required.
         b If no damage is found:
  • do an electrical resistance test through the J13 harness between:
    . pins 4 and 5 (0.5 to 10 ohms)
    . pins 14 and 15 (0.5 to 10 ohms)
    . pins 4 and 16 (> 10 megohms)
    . pins 14 and 16 (> 10 megohms)
    . pin 4 and the ground (> 10 megohms)
    . pin 14 and the ground (> 10 megohms).
         c If the resistance values are in the specified limits:
         d If the resistance values are out of the specified limits:
  • reconnect the J13 harness
  • disconnect the J13 harness from the CJ13 harness at the 6 o'clock junction box
  • do an electrical resistance test through the CJ13 harness between:
    . pins 7 and 8 (0.5 to 10 ohms)
    . pins 1 and 10 (0.5 to 10 ohms)
    . pins 7 and 9 (> 10 megohms)
    . pins 1 and 9 (> 10 megohms)
    . pin 7 and the ground (> 10 megohms)
    . pin 1 and the ground (> 10 megohms).
         e If the resistance values are out of the specified limits:
         f If the resistance values are in the specified limits:
Subtask 77-20-00-810-059-C ** ON A/C NOT FOR ALL
A. The failure message is generated if channel A sensor signal is invalid or out of range.
NOTE: If T3 sensor Part Number is 1348M21P01, P04 or P05, replace T3 sensor AMM 77-23-10-000-002 and AMM 77-23-10-400-002.
   (1) If the failure message T3 SNSR, J13, ECU is not confirmed:
  • no maintenance action is required.
   (2) If the failure message T3 SNSR, J13, ECU is not confirmed, but is repetitive:
  • visually examine the T3 thermocouple receptacle and the CJ13 harness connector for damaged pins and contamination AMM 73-21-50-210-002.
     (a) If harness connector or T3 thermocouple receptacle is damaged:
  • repair or replace as required.
     (b) If no damage is found:
  • visually examine the ECU (4000KS) receptacle and the HJ13 harness connector for damaged pins and contamination AMM 73-21-50-210-002.
       1 If harness connector or ECU receptacle is damaged:
  • repair or replace as required.
       2 If no damage is found:
     (c) If the fault continues during the subsequent flights:
     (d) If the fault continues during the subsequent flights:
     (e) If the fault continues during the subsequent flights:
   (3) If the failure message T3 SNSR, J13, ECU is confirmed:
  • disconnect the two CJ13 connectors from the T3 thermocouple
  • visually examine the T3 thermocouple receptacle and the CJ13 harness connectors for damaged pins and contamination AMM 73-21-50-210-002.
     (a) If harness connectors or T3 thermocouple receptacle are damaged:
  • repair or replace as required.
     (b) If no damage is found:
  • do a resistance check of the two T3 thermocouple connectors between:
    . pins A and B (0.5 to 10 ohms)
    . pin A and the ground (> 10 megohms).
       1 If the resistance values of one of the two T3 thermocouple connectors are out of specified limits:
       2 If the resistance values are in the specified limits:
  • reconnect the CJ13 harness to the T3 thermocouple
  • disconnect the HJ13 harness from the ECU
  • visually examine the ECU (4000KS) receptacle and the HJ13 harness connector for damaged pins and contamination AMM 73-21-50-210-002.
         a If harness connector or ECU receptacle is damaged:
  • repair or replace as required.
         b If no damage is found:
  • do an electrical resistance test through the HJ13 harness between:
    . pins 4 and 5 (0.5 to 10 ohms)
    . pins 14 and 15 (0.5 to 10 ohms)
    . pins 4 and 16 (> 10 megohms)
    . pins 14 and 16 (> 10 megohms)
    . pin 4 and the ground (> 10 megohms)
    . pin 14 and the ground (> 10 megohms).
         c If the resistance values are in the specified limits:
         d If the resistance values are out of the specified limits:
  • reconnect the HJ13 harness
  • disconnect the HJ13 harness from the CJ13 harness at the 6 o'clock junction box
  • do an electrical resistance test through the CJ13 harness between:
    . pins 7 and 8 (0.5 to 10 ohms)
    . pins 1 and 10 (0.5 to 10 ohms)
    . pins 7 and 9 (> 10 megohms)
    . pins 1 and 9 (> 10 megohms)
    . pin 7 and the ground (> 10 megohms)
    . pin 1 and the ground (> 10 megohms).
         e If the resistance values are out of the specified limits:
         f If the resistance values are in the specified limits:
Subtask 77-20-00-710-069-A ** ON A/C NOT FOR ALL
B. Do the test given in Para. 3.A.
   (1) No additional maintenance action is required if the fault is not confirmed.
   (2) Repeat the fault isolation procedure if the fault continues.
[Rev.8 from Aug 2018] 2026.04.04 04:37:44 UTC
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