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R AMM 77-21-10-400-029 Installation of the Lower Right Thermocouple Lead
Assembly
ASM 73-25/15
AWM 71-51-09
3. Fault Confirmation
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A. Do the operational test of the FADEC 2A on the ground (with engine non motoring) (Ref. AMM TASK 73-29-00-710-040).
4. Fault Isolation
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A. If the test gives the maintenance message T495 SNSR, J13, ECU:
- do a check for open or short to ground of the harness HJ13 between the ECU (4000KS) and the 6 o'clock junction box, between the 6 o'clock junction box and the T495 thermocouple (Ref. AWM 71-51-09) and (Ref. ASM 73-25/15).
(1) If the wiring is not correct:
- repair the above wiring.
(2) If the wiring is correct:
- disconnect the harness HJ13 from the ECU (4000KS) and do a resistance check of the cable between: . pins 12 and 13 (1 to 10 ohms) . pins 12 and 24 (> 10 megohms) . pin 12 and the ground (> 10 megohms).
(a) 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).
(b) If the resistance values are out of the specified limits:
- disconnect the harness CJ13 at the 6 o'clock junction box and do a resistance check of the harness CJ13 between: . pins 3 and 13 (1 to 10 ohms) . pins 3 and 12 (> 10 megohms) . pin 3 and the ground (> 10 megohms).
1 If the resistance values are in the specified limits:
_
- replace the harness HJ13 (Ref. AMM TASK 73-21-50-000-046) and (Ref. AMM TASK 73-21-50-400-046).
2 If the resistance values are out of the specified limits:
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- disconnect the harness CJ13 from the T495 thermocouple and do a resistance check of the T495 thermocouple between: . pins A and B (1 to 10 ohms) . pin A and the ground (> 10 megohms).
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E F 『 E C F M E E E E 56 E E E a If the resistance values are in the specified limits:
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- replace the harness CJ13 (Ref. AMM TASK 73-21-50-000-029) and (Ref. AMM TASK 73-21-50-400-029).
b If the resistance values are out of the specified limits,
_ do an inspection/check of the T495 thermocouple wiring harness for isolation of the defective part (Ref. AMM TASK 77-21-10-200-002).
- if the electrical check of one of the three two-probe lead assemblies is not correct, replace the defective thermocouple: . the lower left-hand thermocouple lead assembly (Ref. AMM TASK 77-21-10-000-027) and (Ref. AMM TASK 77-21-10-400-027) or . the lower right-hand thermocouple lead assembly (Ref. AMM TASK 77-21-10-000-029) and (Ref. AMM TASK 77-21-10-400-029) or . the upper left-hand thermocouple lead assembly (Ref. AMM TASK 77-21-10-000-028) and (Ref. AMM TASK 77-21-10-400-028).
- if the electrical check of the three-probe lead assembly is not correct: . replace the three-probe thermocouple lead assembly (Ref. AMM TASK 77-21-10-000-026) and (Ref. AMM TASK 77-21-10-400-026), (Ref. AMM TASK 77-21-10-000-027) and (Ref. AMM TASK 77-21-10-400-027), (Ref. AMM TASK 77-21-10-000-028) and (Ref. AMM TASK 77-21-10-400-028), (Ref. AMM TASK 77-21-10-000-029) and (Ref. AMM TASK 77-21-10-400-029).
- if the electrical check of the upper extension lead is not correct: . replace the upper extension lead (Ref. AMM TASK 77-21-10-000-008) and (Ref. AMM TASK 77-21-10-400-008).
- if the electrical check of the lower extension lead is not correct: . replace the lower extension lead (Ref. AMM TASK 77-21-10-000-009) and (Ref. AMM TASK 77-21-10-400-009).
- if the electrical check of the main junction box assembly is not correct: . replace the main junction box assembly (Ref. AMM TASK 77-21-10-000-025) and (Ref. AMM TASK 77-21-10-400-025).
B. Do the test given in Para. 3.A.
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TASK 77-20-00-810-805
Loss of the T3 Thermocouple Signal - Engine 1 - Channel A and Channel B
1. Possible Causes
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- T3 thermocouple
- CJ13 harness 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320 Trouble Shooting Manual 排故手册 发动机指示(166)
