F 『 E C F M E E E E 56 E E E (a) If the fault continues during the subsequent flights:

 - replace the Hydromechanical Unit (HMU) (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).
 (b) If the fault continues during the subsequent flights:
 - replace the HJ7 harness (Ref. AMM TASK 73-21-50-000-040) and (Ref. AMM TASK 73-21-50-400-040).
 (3) If the failure message J7, HMU(VBV TM), ECU is confirmed:
 (a) Disconnect the HJ7 harness from the ECU (4000KS) receptacle.
 1 Visually examine the ECU (4000KS) receptacle and the HJ7
_ 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 HJ7 harness between: . pins 29 and 30 (17 to 23 ohms) . pins 29 and 13 (> 10 megohms) . pin 29 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 HJ7 harness to the ECU (4000KS).
 (b) Disconnect the HJ7 harness from the HMU receptacle (HMU-A) (located in the left core compartment).
 1 Visually examine the HJ7 harness connector and the HMU
_ receptacle for damaged pins and contamination (Ref. AMM TASK 73-21-50-210-001).
 a If harness connector or HMU receptacle is damaged:
_ - repair or replace as required.
 b If no damage is found:
_
 - do an electrical resistance test through the HMU receptacle between: . pins 27 and 28 (17 to 23 ohms) . pins 27 and 12 (> 10 megohms) . pin 27 and the ground (> 10 megohms).
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ECES  F 『 E C F M E E E E 56 E E E c If the resistance values are out of the specified limits:

_
 - replace the HMU (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).
 d If the resistance values are in the specified limits:
_
 - replace the HJ7 harness (Ref. AMM TASK 73-21-50-000-040) and (Ref. AMM TASK 73-21-50-400-040).
 (4) If the failure message J8, HMU(VBV TM), ECU is confirmed:
 (a) Disconnect the HJ8 harness from the ECU (4000KS) receptacle.
 1 Visually examine the ECU (4000KS) receptacle and the HJ8
_ 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 HJ8 harness between: . pins 29 and 30 (17 to 23 ohms) . pins 29 and 13 (> 10 megohms) . pin 29 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 HJ8 harness to the ECU (4000KS).
 (b) Disconnect the HJ8 harness from the HMU receptacle (HMU-B) (located in the left core compartment).
 1 Visually examine the HJ8 harness connector and the HMU
_ receptacle for damaged pins and contamination (Ref. AMM TASK 73-21-50-210-001).
 a If harness connector or HMU receptacle is damaged:
_ - repair or replace as required.
 b If no damage is found:
_
 - do an electrical resistance test through the HMU receptacle between: . pins 27 and 28 (17 to 23 ohms) . pins 27 and 12 (> 10 megohms) . pin 27 and the ground (> 10 megohms).
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ECES

 F  『
 E  C F M  E
 E  E

 E 56 E E E c If the resistance values are out of the specified limits:

_
 - replace the HMU (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).
 d If the resistance values are in the specified limits:
_
 - replace the HJ8 harness (Ref. AMM TASK 73-21-50-000-041) and (Ref. AMM TASK 73-21-50-400-041).
 (5) If the failure messages J7, HMU(VBV TM), ECU + J8, HMU(VBV TM), ECU are confirmed on both channel A and channel B:
 - replace the ECU right away for dual channel fault (Ref. AMM TASK 73-21-60-000-001) (Ref. AMM TASK 73-21-60-400-001).
　
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