- Visually examine the J7 harness connector for damaged pins, contamination and fuel wetting (Ref. AMM TASK 73-21-50-210-002).

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 (a) If damage on a connector is found:

 - Replace or repair as required.
 (b) If fuel wetting is found:

 - replace the harness J7, (Ref. AMM TASK 73-21-50-000-040) and (Ref. AMM TASK 73-21-50-400-040).

 (c) If nothing is found:

 - No further action is required.
 (2) If the test does not give the maintenance message J7, HMU(FMVRES), ECU, but is repetitive after the troubleshooting per step 4.A.(1) has been fully done:

 - replace the harness J7, (Ref. AMM TASK 73-21-50-000-040) and (Ref. AMM TASK 73-21-50-400-040).
 (a) 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 test gives the maintenance message J7, HMU(FMVRES), ECU:

 - disconnect the J7 harness from the HMU receptacle (HMU-A) (located in the left core compartment) and visually examine the J7 harness connector and the HMU receptacle for damaged pins, contamination and fuel wetting (Ref. AMM TASK 73-21-50-210-002).
 (a) If damage on a connector is found:

 - Replace or repair as required.

 (b) If fuel wetting is found:

 - replace the harness J7, (Ref. AMM TASK 73-21-50-000-040) and (Ref. AMM TASK 73-21-50-400-040).

 (c) If nothing is found:

 - Do an electrical resistance test through the HMU receptacle between: . pins 16 and 34 (34 to 46 or 85 to 150 Ohms) . pins 35 and 36 (21 to 29 or 44 to 76 Ohms) . pins 18 and 37 (21 to 29 or 44 to 76 Ohms) . pins 16 and 17 (> 10 Megohms) . pins 35 and 17 (> 10 Megohms) . pins 18 and 17 (> 10 Megohms) . pin 16 and the ground (> 10 Megohms) . pin 35 and the ground (> 10 Megohms) . pin 18 and the ground (> 10 Megohms).
 1 If the resistance values are out of the specified limits:
_
 - replace the Hydromechanical Unit (HMU), (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).
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 F 『 E C F M E E E E 56 E E E 2 If the resistance values are in the specified limits:

_
 - reconnect the harness J7, (Ref. AMM TASK 73-21-50-000-040) and (Ref. AMM TASK 73-21-50-400-040) and continue the troubleshooting.
 (d) Disconnect the J7 harness from the ECU (4000KS) receptacle and visually examine the J7 harness connector and the ECU (4000KS) receptacle for damaged pins and contamination (Ref. AMM TASK 73-21-50-210-002).
 1 If damage on a connector is found:
_ - replace or repair as required.
 2 If nothing is found:
_
 - Do an electrical resistance test through the J7 harness between: . pins 16 and 34 (34 to 46 or 85 to 150 Ohms) . pins 35 and 36 (21 to 29 or 44 to 76 Ohms) . pins 18 and 37 (21 to 29 or 44 to 76 Ohms) . pins 16 and 17 (> 10 Megohms) . pins 35 and 17 (> 10 Megohms) . pins 18 and 17 (> 10 Megohms) . pin 16 and the ground (> 10 Megohms) . pin 35 and the ground (> 10 Megohms) . pin 18 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:
_
 - replace the harness J7, (Ref. AMM TASK 73-21-50-000-040) and (Ref. AMM TASK 73-21-50-400-040).
 B. Do the test given in Para. 3.A.(1).
 (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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 TASK 73-29-00-810-865
 Loss of the Feedback Signal from the FMV Resolver through the Channel B on Engine 1
 1. Possible Causes
_______________
 - Hydromechanical Unit (HMU)

 - harness J8

 - ECU (4000KS)

 2. Job Set-up Information
　
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本文鏈接地址：A320 Trouble Shooting Manual 排故手冊 發(fā)動機(jī)燃油和控制 2(121)