R A. The failure message is generated if channel A sensor signal is invalid or R out of range. R NOTE : If T3 sensor Part Number is 1348M21P01, P04 or P05, replace T3
____ R sensor (Ref. AMM TASK 77-23-10-000-001) and (Ref. AMM TASK 77-23-10-400-001).
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R (1) If the failure message T3 SNSR, J13, ECU is not confirmed: R - no maintenance action is required.
R (2) If the failure message T3 SNSR, J13, ECU is not confirmed, but is R repetitive: R - visually examine the T3 thermocouple receptacle and the CJ13 R harness connector for damaged pins and contamination (Ref. AMM TASK
 73-21-50-210-001).
R (a) If harness connector or T3 thermocouple receptacle is damaged: R - repair or replace as required.
R (b) If no damage is found: R - visually examine the ECU (4000KS) receptacle and the HJ13 R harness connector for damaged pins and contamination (Ref. AMM
 TASK 73-21-50-210-001).
R 1_ If harness connector or ECU receptacle is damaged:
R - repair or replace as required.

R 2_ If no damage is found:
R - replace the T3 thermocouple (Ref. AMM TASK 77-23-10-000-002)
R and (Ref. AMM TASK 77-23-10-400-002).

R (c) If the fault continues during the subsequent flights:
R - replace the CJ13 harness (Ref. AMM TASK 73-21-50-000-029) and
R (Ref. AMM TASK 73-21-50-400-029).

R (d) If the fault continues during the subsequent flights:
R - replace the HJ13 harness (Ref. AMM TASK 73-21-50-000-046) and
R (Ref. AMM TASK 73-21-50-400-046).

R (e) If the fault continues during the subsequent flights:
R - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and
R (Ref. AMM TASK 73-21-60-400-001).

R (3) If the failure message T3 SNSR, J13, ECU is confirmed:
R - disconnect the two CJ13 connectors from the T3 thermocouple
R - visually examine the T3 thermocouple receptacle and the CJ13
R harness connectors for damaged pins and contamination (Ref. AMM

 TASK 73-21-50-210-001).
R (a) If harness connectors or T3 thermocouple receptacle are damaged:
R - repair or replace as required.

R (b) If no damage is found:
R - do a resistance check of the two T3 thermocouple connectors
R between:

R . pins A and B (0.5 to 10 ohms)

R . pin A and the ground (> 10 megohms).

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 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 77-23-10-000-002) and (Ref. AMM TASK 77-23-10-400-002).
 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)
R  . 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).

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