(d) If the fault continues during the subsequent flights:

 - replace the HJ13 harness (Ref. AMM TASK 73-21-50-000-046) and (Ref. AMM TASK 73-21-50-400-046).

 (e) If the fault continues during the subsequent flights:

 - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
 (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 (Ref. AMM TASK 73-21-50-210-001).

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 (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:
 - replace the T3 thermocouple (Ref. AMM TASK 77-23-10-000-001) and (Ref. AMM TASK 77-23-10-400-001).
 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 (Ref. AMM TASK 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 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:
_
 - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
 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).

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 E 56 E E E e If the resistance values are out of the specified limits:

_
 - replace the CJ13 harness (Ref. AMM TASK 73-21-50-000-029) and (Ref. AMM TASK 73-21-50-400-029).
 f If the resistance values are in the specified limits:
_
 - replace the HJ13 harness (Ref. AMM TASK 73-21-50-000-046) and (Ref. AMM TASK 73-21-50-400-046).
 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.

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ECES  TASK 77-20-00-810-829

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 1. Possible Causes
 Loss of the T3 Thermocouple Signal - Engine 2 - Channel B _______________
 - T3 thermocouple

 - CJ13 harness

 - HJ13 harness

 - ECU (4000KS)

 2. Job Set-up Information______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM  73-21-50-000-029 
AMM  73-21-50-000-046 
AMM  73-21-50-210-001 
AMM  73-21-50-400-029 
AMM  73-21-50-400-046 
AMM  73-21-60-000-001 
AMM  73-21-60-400-001 
　
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