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 4 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).
 5 If the fault continues:
_
 - replace the harness HJ7 (Ref. AMM TASK 73-21-50-000-040) and (Ref. AMM TASK 73-21-50-400-040).
 (3) If the failure message HPTC VLV (POS), HMU on channel 1A is confirmed:
 (a) Disconnect the harness HJ7 from the ECU and do a check of resistance between: . pins 23 and 24 (17 to 23 Ohms).
 1 If the resistance values are 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).
 a If the fault continues:
_
 - replace the Hydromechanical Unit (HMU) (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).
 b 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).
 c If the fault continues:
_
 - replace the harness HJ7 (Ref. AMM TASK 73-21-50-000-040) and (Ref. AMM TASK 73-21-50-400-040).
 (b) If the resistance values are out of the specified limits:
 - disconnect the harness HJ7 from the HMU and do a check of the HMU resistance between: . pins 23 and 24 (17 to 23 Ohms).
 1 If the resistance values are in the specified limits:
_
 - replace the harness HJ7 (Ref. AMM TASK 73-21-50-000-040) and (Ref. AMM TASK 73-21-50-400-040).
R 2_If the resistance values are out of the specified limits:
 - replace the Hydromechanical Unit (HMU) (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).
 NOTE : Tighten the connector by hand plus one eighth of a
____ turn. If necessary use soft nose pliers.
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 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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 Failure of the HPTCC Valve Channel A on Engine 2
 1. Possible Causes_______________
 - TCC sensor(s)

 - High Pressure Turbine Clearance Control (HPTCC) Valve

 - Hydromechanical Unit (HMU)

 - ECU (4000KS)

 - harness HJ7

 - High Pressure Turbine Clearance Control (HPTCC) valve

 2. Job Set-up Information______________________
 A. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE  DESIGNATION
 -------------------------------------------------------------------------------
AMM 73-21-10-000-002  Removal of the Hydromechanical Unit (HMU)
 AMM 73-21-10-400-002  Installation of the Hydromechanical Unit (HMU)
 AMM 73-21-50-000-040  Removal of the HJ7 Harness
 AMM 73-21-50-210-002  Visual Inspection of the Wiring Harnesses
 AMM 73-21-50-400-040  Installation of the HJ7 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 73-21-70-000-002  Removal of the High Pressure Turbine Clearance Control (HPTCC) Sensor
 AMM 73-21-70-400-002  Installation of the High Pressure Turbine Clearance Control (HPTCC) Sensor
 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. Do the operational test of the FADEC 2A on the ground with engine non motoring (Ref. AMM TASK 73-29-00-710-040).
　
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