- ECU (4000KS)

 - HJ7 harness

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 71-00-00-710-003 Engine Automatic Start AMM 73-11-10-000-003 Removal of the Fuel Pump and Filter Assembly AMM 73-11-10-400-003 Installation of the Fuel Pump and Filter Assembly AMM 73-21-10-000-002 Removal of the Hydromechanical Unit (HMU) AMM 73-21-10-400-002 Installation of the Hydromechanical Unit (HMU) AMM 73-21-50-000-040 Removal of the HJ7 Harness AMM 73-21-50-210-001 Visual Inspection of the Wiring Harness AMM 73-21-50-400-040 Installation of the HJ7 Harness AMM 73-21-60-000-001 Removal of the Electronic Control Unit (ECU) AMM 73-21-60-400-001 Installation of the Electronic Control Unit (ECU)
 3. Fault Confirmation
__________________
 A. Perfom an engine start (Ref. AMM TASK 71-00-00-710-003).
 4. Fault Isolation
_______________
 A. This fault is generated if an Overspeed Governor (OSG) switch position
 fault is detected during an engine start. This fault can be caused by a R failed switch in the HMU, an open or short circuit in the HJ7 harness, R low fuel pressure to the HMU, or a failed main fuel pump shaft.
 (1) If the failure message HMU (OSG), J7 occurs during an engine start:
 - restart the engine to confirm the fault (Ref. AMM TASK 71-00-00-710-003).
 (a) If the fault does not repeat:
 - no maintenance action is required.
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 (2) If the failure message HMU (OSG), J7 is not confirmed after re-start, but is repetitive:
 (a) Disconnect the HJ7 harness from the HMU receptacle (HMU-A) (located in the left core compartment).
 1 Visually examine the HMU receptacle and the HJ7 harness
_ connector for damaged pins, contamination and fuel wetting (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:
_ - reconnect the HJ7 harness.
R (b) If the HMU part number is 8061-512 (GE SPEC 1348M79P07):
 - replace the main fuel pump (Ref. AMM TASK 73-11-10-000-003) and (Ref. AMM TASK 73-11-10-400-003).
 1 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).
 2 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 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).
R (c) If the HMU part number is 8061-526 (GE SPEC 1348M79P08) or R higher:
 - remove the HMU (Ref. AMM TASK 73-21-10-000-002).
 1 Inspect main fuel pump shaft.
_ a If damaged/broken or worn:
_
 - replace the Main Fuel Pump (MFP) (Ref. AMM TASK 73-11-10-000-003) and (Ref. AMM TASK 73-11-10-400-003).
 b If not damaged/broken or worn:
_
 - replace the HMU (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).
 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).
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 d 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 HMU (OSG), J7 is confirmed:
R (a) If the HMU part number is 8061-512 (GE SPEC 1348M79P07):
 - remove the HMU (Ref. AMM TASK 73-21-10-000-002).
 1 Inspect main fuel pump shaft.
_ a If damaged/broken or worn:
_
 - replace the main fuel pump (Ref. AMM TASK 73-11-10-000-003) and (Ref. AMM TASK 73-11-10-400-003).
 b If not damaged/broken or worn:
_
 - replace the HMU (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).
　
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