____ 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 75-21-00-810-809
 Loss of the Feedback Signal on the Channel A of the HPTCC Valve on Engine 1
 1. Possible Causes
_______________
 - High Pressure Turbine Clearance Control (HPTCC) Valve

 - ECU (4000KS)

 - harness HJ11

 - harness CJ11R

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 73-21-50-000-026 Removal of the CJ11R Harness AMM 73-21-50-000-044 Removal of the HJ11 Harness AMM 73-21-50-400-026 Installation of the CJ11R Harness AMM 73-21-50-400-044 Installation of the HJ11 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, J11, ECU is not confirmed:
 (a) No maintenance action required.
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 (2) If the failure message HPTC VLV, J11, 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 is confirmed:
 (a) Disconnect the harness HJ11 from the ECU and do a resistance check of the harness HJ11 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 harness CJ11R 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) . pin 2 and the ground (> 10 Megohms) . pin 4 and the ground (> 10 Megohms) . pin 6 and the ground (> 10 Megohms).
R 3_If the resistance values are not in the specified limits:
 - 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).
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