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R R R R R 4_ If the resistance values are in the specified limits:- disconnect the harness HJ11 from the harness CJ11R at the 6 o'clock junction box and do a check of the resistance of the harness CJ11R between: . pins 29 and 30 (68 to 102 ohms) . pins 18 and 31 (30 to 42 ohms) . pins 16 and 28 (22 to 30 ohms) . pins 29 and 17 (> 10 Megohms) . pins 18 and 17 (> 10 Megohms) . pins 16 and 17 (> 10 Megohms) . pin 29 and the ground (> 10 Megohms) . pin 18 and the ground (> 10 Megohms) . pin 16 and the ground (> 10 Megohms).
R a_ If the resistance values are in the specified limits: - replace the harness HJ11 (Ref. AMM TASK 73-21-50-000-044) and (Ref. AMM TASK 73-21-50-400-044).
R b_ If the resistance values are not in the specified limits: - replace the harness CJ11R (Ref. AMM TASK 73-21-50-000-026) and (Ref. AMM TASK 73-21-50-400-026).
NOTE : Tighten the connector by hand plus one eighth of a____ turn. If necessary use soft nose pliers.
B. Do the test given in para. 3.
(1) No additional maintenance action is required if the fault is not confirmed.
R (2) Continue the fault isolation procedure if the fault continues.
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TASK 75-21-00-810-811
Loss of the Feedback Signal on the Channel B of the HPTCC Valve on Engine 1
1. Possible Causes
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- High Pressure Turbine Clearance Control (HPTCC) Valve
- ECU (4000KS)
- harness HJ12
- harness CJ12R
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 73-21-50-000-028 Removal of the CJ12R Harness AMM 73-21-50-000-045 Removal of the HJ12 Harness AMM 73-21-50-400-028 Installation of the CJ12R Harness AMM 73-21-50-400-045 Installation of the HJ12 Harness 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) AMM 75-21-10-000-002 Removal of the High Pressure Turbine Active Clearance Control (HPTACC) Valve AMM 75-21-10-400-002 Installation of the High Pressure Turbine Active Clearance Control (HPTACC) Valve
3. Fault Confirmation
__________________
A. Test
(1) Do the operational test of the FADEC 1 on the ground with engine non motoring (Ref. AMM TASK 73-29-00-710-040).
4. Fault Isolation
_______________
A. This failure message is triggered when there is a disagreement between channels A and B position signal from the HPTCC Valve or the signal is out of range.
(1) If the failure message HPTC VLV, J12, ECU is not confirmed:
(a) No maintenance action required.
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(2) If the failure message HPTC VLV, J12, ECU is not confirmed but is repetitive:
(a) Do the following trouble shooting at next maintenance opportunity:
- replace the High Pressure Turbine Clearance Control (HPTCC) Valve (Ref. AMM TASK 75-21-10-000-002) and (Ref. AMM TASK 75-21-10-400-002).
1 If the fault continues:
_
- replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
NOTE : Tighten the connector by hand plus one eighth of a
____ turn. If necessary use soft nose pliers.
(3) If the failure message HPTC VLV, J12, ECU is confirmed:
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