2
_ R R R
R
R R R 3
_
 F EEFF : ALL E E ECES If no damage is found:
- clean the connector and receptacle with a bristle brush and stoddard solvent (Material No. CP2011) (Ref. AMM TASK 73-21-50-210-002).

 - do an electrical resistance test through the HMU receptacle between: . pins 21 and 41 (< 5 ohms) . pins 21 and 8 (> 10 megohms) . pin 21 and the ground (> 10 megohms).

 a_ If the resistance values are out of the specified limits:
 - replace the HMU (Ref. AMM TASK 73-21-10-000-001) and
 (Ref. AMM TASK 73-21-10-400-001).

 b If the resistance values are in the specified limits:
_
 - reconnect the J7 harness

 - disconnect the J7 harness from the ECU (4000KS) receptacle

 - visually examine the ECU (4000KS) receptacle and the J7 harness connector for damaged pins or contamination (Ref. AMM TASK 73-21-50-210-002).

 c If harness connector or ECU receptacle is damaged:
_ - repair or replace as required.
 d If no damage is found:
_
- clean the connector and receptacle with a bristle brush and stoddard solvent (Material No. CP2011) (Ref. AMM TASK 73-21-50-210-002).

 - do an electrical resistance test through the HMU receptacle between: . pins 21 and 41 (< 5 ohms) . pins 21 and 8 (> 10 megohms) . pin 21 and the ground (> 10 megohms).

 e 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).
 f If the resistance values are out of the specified limits:
_
 - replace the J7 harness (Ref. AMM TASK 73-21-50-000-006) and (Ref. AMM TASK 73-21-50-400-006).
If the fault continues during the subsequent flights:
 - remove the HMU (Ref. AMM TASK 73-21-10-000-001)

 - inspect main fuel pump shaft.

 a If damaged/broken or worn:
_
 - replace the main fuel pump (Ref. AMM TASK 73-11-10-000-001) and (Ref. AMM TASK 73-11-10-400-001).
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 E 56 E E E b If not damaged/broken or worn:

_
 - replace the HMU (Ref. AMM TASK 73-21-10-000-001) and (Ref. AMM TASK 73-21-10-400-001).
 B. Do the test given in Para. 3.A.
 (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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ECES  TASK 73-20-00-810-947 Failure of the PS12 Signal on Engine 1

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 1. Possible Causes
_______________
 - ECU (4000KS)
 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 73-21-60-000-001 Removal of the Electronic Control Unit (ECU)(4000KS) AMM 73-21-60-400-001 Installation of the Electronic Control Unit (ECU)(4000KS) AMM 73-29-00-710-040 Operational Test of the FADEC on the Ground (with Engine non Motoring)
 3. Fault Confirmation
__________________
 A. Do the operational test of the FADEC 1B on the ground (with engine non motoring) (Ref. AMM TASK 73-29-00-710-040).
 4. Fault Isolation
_______________
 A. If the test gives the maintenance message ECU (PS12 SENSOR):
 - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) (Ref. AMM TASK 73-21-60-400-001).
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ECES  TASK 73-20-00-810-948 Failure of the PS12 Signal on Engine 2

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 1. Possible Causes
_______________
 - ECU (4000KS)
 2. Job Set-up Information
　
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