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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_
- 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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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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