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. pin 6 and the ground (> 10 megohms).
(c) If the resistance values are out of the specified limits:
- replace the LPTC valve (Ref. AMM TASK 75-22-10-000-001) and (Ref. AMM TASK 75-22-10-400-001).
(d) If the resistance values are in the specified limits:
- connect the CJ12R harness (LPT-A) connector to the LPTC valve receptacle (located in the right core compartment),
- disconnect the J12 harness from the ECU (4000KS) and visually examine the receptacles and the connectors for damaged pins or contamination (Ref. AMM TASK 73-21-50-210-001).
1 If damage is found:
_ - repair or replace as required.
2 If no damage is found:
_
- do an electrical resistance test through the J12 harness between: . pins 4 and 5 (80 to 109.5 ohms) . pins 6 and 7 (85 to 115 ohms) . pins 2 and 3 (85 to 115 ohms) . pins 4 and 1 (> 10 megohms) . pins 6 and 1 (> 10 megohms) . pins 2 and 1 (> 10 megohms) . pin 4 and the ground (> 10 megohms) . pin 6 and the ground (> 10 megohms) . pin 2 and the ground (> 10 megohms).
3 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).
4 If the resistance values are out of the specified limits:
_
- disconnect the J12 harness from the CJ12R harness located at the 6 o'clock junction box and do an electrical resistance test through the CJ12R harness between: . pins 20 and 21 (80 to 109.5 ohms) . pins 7 and 19 (85 to 115 ohms) . pins 2 and 9 (85 to 115 ohms) . pins 20 and 8 (> 10 megohms) . pins 7 and 8 (> 10 megohms) . pins 2 and 8 (> 10 megohms) . pin 20 and the ground (> 10 megohms) . pin 7 and the ground (> 10 megohms) . pin 2 and the ground (> 10 megohms).
5 If the resistance values are in the specified limits:
_
- replace the harness J12 (ECU to the 6 o'clock junction box) (Ref. AMM TASK 73-21-50-000-011) and (Ref. AMM TASK 73-21-50-400-011).
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6 If the resistance values are out of the specified limits:
_
- replace the harness CJ12R (Ref. AMM TASK 73-21-50-000-004) and (Ref. AMM TASK 73-21-50-400-004).
R **ON A/C 106-149, 155-199, 208-299, 301-399, 401-499,
A. The failure messages are generated if the channels A and B signals are invalid, out of range, or both channels disagree.
(1) If the failure messages LPTC VLV, J11, ECU and LPTC VLV, J12, ECU are not confirmed:
(a) No maintenance action is required.
(2) If the failure messages LPTC VLV, J11, ECU and LPTC VLV, J12, ECU are not confirmed but are repetitive:
- disconnect the CJ11R and CJ12R harnesses from the LPTC valve (LPT-A and LPT-B connectors) and visually examine the receptacles and the connectors for damaged pins or contamination (Ref. AMM TASK 73-21-50-210-002).
(a) If damage is found:
- repair or replace as required.
(b) If no damage is found:
- replace the LPTC valve (Ref. AMM TASK 75-22-10-000-002) and (Ref. AMM TASK 75-22-10-400-002).
(c) 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).
(d) If the fault continues during the subsequent flights:
- replace the harness HJ11 (Ref. AMM TASK 73-21-50-000-044) and (Ref. AMM TASK 73-21-50-400-044).
(e) If the fault continues during the subsequent flights:
- replace the harness CJ11R (located in the right core compartment) (Ref. AMM TASK 73-21-50-000-026) (Ref. AMM TASK 73-21-50-400-026).
(f) If the fault continues during the subsequent flights:
- replace the harness HJ12 (Ref. AMM TASK 73-21-50-000-045) and (Ref. AMM TASK 73-21-50-400-045).
(g) If the fault continues during the subsequent flights:
- replace the harness CJ12R (located in the right core compartment) (Ref. AMM TASK 73-21-50-000-028) (Ref. AMM TASK 73-21-50-400-028).
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本文链接地址：A320 Trouble Shooting Manual 排故手册 大气 AIR(28)
