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4_ If the resistance values are out of the specified limits:
- disconnect the HJ11 harness from the CJ11R harness located
at the 6 o'clock junction box and do an electrical
resistance test through the CJ11R 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 HJ11 (ECU to the 6 o'clock junction box)
(Ref. AMM TASK 73-21-50-000-044) and (Ref. AMM TASK 73-21-
50-400-044).
6_ If the resistance values are out of the specified limits:
- replace the harness CJ11R (Ref. AMM TASK 73-21-50-000-026)
and (Ref. AMM TASK 73-21-50-400-026).
- disconnect the CJ12R harness (LPT-A) connector (located in the right core compartment) from the LPTC valve 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:
- do the electrical resistance test through the LPTC valve between: . pins 2 and 3 (80 to 109.5 ohms) . pins 4 and 5 (85 to 115 ohms) . pins 6 and 7 (85 to 115 ohms) . pin 2 and the ground (> 10 megohms) . pin 4 and the ground (> 10 megohms) . 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 75-22-10-000-002) and (Ref. AMM TASK 75-22-10-400-002).
(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 HJ12 harness from the ECU (4000KS) and visually examine the receptacles and the connectors for damaged pins or contamination (Ref. AMM TASK 73-21-50-210-002).
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R 1_ If damage is found:
R - repair or replace as required.
R 2_ If no damage is found:
R - do an electrical resistance test through the HJ12 harness
R between:
R . pins 4 and 5 (80 to 109.5 ohms)
R . pins 6 and 7 (85 to 115 ohms)
R . pins 2 and 3 (85 to 115 ohms)
R . pins 4 and 1 (> 10 megohms)
R . pins 6 and 1 (> 10 megohms)
R . pins 2 and 1 (> 10 megohms)
R . pin 4 and the ground (> 10 megohms)
R . pin 6 and the ground (> 10 megohms)
R . pin 2 and the ground (> 10 megohms).
R 3_ If the resistance values are in the specified limits:
R - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001)
R and (Ref. AMM TASK 73-21-60-400-001).
R 4_ If the resistance values are out of the specified limits:
R - disconnect the HJ12 harness from the CJ12R harness located
R at the 6 o'clock junction box and do an electrical
R resistance test through the CJ12R harness between:
R . pins 20 and 21 (80 to 109.5 ohms)
R . pins 7 and 19 (85 to 115 ohms)
R . pins 2 and 9 (85 to 115 ohms)
R . pins 20 and 8 (> 10 megohms)
R . pins 7 and 8 (> 10 megohms)
R . pins 2 and 8 (> 10 megohms)
R . pin 20 and the ground (> 10 megohms)
R . pin 7 and the ground (> 10 megohms)
R . pin 2 and the ground (> 10 megohms).
R 5_ If the resistance values are in the specified limits:
R - replace the harness HJ12 (ECU to the 6 o'clock junction box)
R (Ref. AMM TASK 73-21-50-000-045) and (Ref. AMM TASK 73-21-R 50-400-045).
R 6_ If the resistance values are out of the specified limits:
R - replace the harness CJ12R (Ref. AMM TASK 73-21-50-000-028)
R and (Ref. AMM TASK 73-21-50-400-028).
R **ON A/C ALL
R B. Do the test given in Para. 3.A.
R (1) No additional maintenance action is required if the fault is not 中國航空網 www.k6050.com 航空翻譯 www.aviation.cn 本文鏈接地址：A320 Trouble Shooting Manual 排故手冊 大氣 AIR(34)
