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 Loss of the Feedback Signal from the HPTCC Valve through the two Channels on Engine 1
 1. Possible Causes
_______________
 - High Pressure Turbine Clearance Control (HPTCC) Valve

 - ECU (4000KS)

 - harness HJ11

 - harness HJ12

 - harness CJ11R

 - harness CJ12R

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM  73-21-50-000-026 
AMM  73-21-50-000-028 
AMM  73-21-50-000-044 
AMM  73-21-50-000-045 
AMM  73-21-50-400-026 
AMM  73-21-50-400-028 
AMM  73-21-50-400-044 
AMM  73-21-50-400-045 
AMM  73-21-60-000-001 
AMM  73-21-60-400-001 
AMM  73-29-00-710-040 
AMM  75-21-10-000-002 
AMM  75-21-10-400-002 

3. Fault Confirmation
__________________
 A. Test
Removal of the CJ11R HarnessRemoval of the CJ12R HarnessRemoval of the HJ11 HarnessRemoval of the HJ12 HarnessInstallation of the CJ11R HarnessInstallation of the CJ12R HarnessInstallation of the HJ11 HarnessInstallation of the HJ12 HarnessRemoval of the Electronic Control Unit (ECU)(4000KS)Installation of the Electronic Control Unit (ECU)(4000KS)Operational Test of the FADEC on the Ground (with Engine non Motoring)Removal of the High Pressure Turbine Active Clearance Control (HPTACC) ValveInstallation of the High Pressure Turbine Active Clearance Control (HPTACC) Valve
 (1) Do the operational test of the FADEC 1 on the ground with engine non motoring (Ref. AMM TASK 73-29-00-710-040).
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 4. Fault Isolation
_______________
 A. This failure message is triggered when there is a disagreement between channels A and B position signals from the HPTCC Valve or one or both signals is out of range.
 (1) If the failure message HPTC VLV, J11, ECU and HPTC VLV, J12, ECU is not confirmed:

 (a) No maintenance action required.

 (2) If the failure message HPTC VLV, J11, ECU and 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, J11, ECU and HPTC VLV, J12, ECU is confirmed:
 (a) Disconnect the harnesses HJ11 and HJ12 from the ECU and do a
R  resistance check of the harnesses HJ11 and HJ12 between: . pins 34 and 35 (68 to 102 Ohms) . pins 18 and 36 (30 to 42 Ohms) . pins 16 and 33 (22 to 30 Ohms) . pins 34 and 17 (> 10 Megohms) . pins 18 and 17 (> 10 Megohms) . pins 16 and 17 (> 10 Megohms) . pin 34 and the ground (> 10 Megohms) . pin 18 and the ground (> 10 Megohms)
R  . pin 16 and the ground (> 10 Megohms).
 1 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).
 2 If the resistance values are not in the specified limits:
_
 - disconnect the harnesses CJ11R and CJ12R from the HPTCC Valve and do a resistance check of the HPTCC Valve between: . pins 2 and 3 (68 to 102 Ohms) . pins 4 and 5 (30 to 42 Ohms) . pins 6 and 7 (22 to 30 Ohms)
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 . pin 2 and the ground (> 10 Megohms) . pin 4 and the ground (> 10 Megohms) . pin 6 and the ground (> 10 Megohms).

 NOTE : Tighten the connector by hand plus one eighth of a
____ turn. If necessary use soft nose pliers.
　
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