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R  6 If the fault continues:_ - replace the harness HJ8 (Ref. AMM TASK 73-21-50-000-041) and (Ref. AMM TASK 73-21-50-400-041).
 (3) If the failure message HPTC VLV (POS), HMU on channel 2B is confirmed:
 (a) Disconnect the harness HJ8 from the ECU and do a check of resistance between: 
R  . pins 23 and 24 (17 to 23 ohms).
 1 If the resistance values are in 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 HJ8 (Ref. AMM TASK 73-21-50-000-041) and (Ref. AMM TASK 73-21-50-400-041).
 (b) If the resistance values are out of the specified limits: - disconnect the harness HJ8 from the HMU and do a check of the
 HMU resistance between: 
R  . pins 23 and 24 (17 to 23 ohms).
R  1 If the resistance values are in the specified limits:_ - replace the harness HJ8 (Ref. AMM TASK 73-21-50-000-041) and (Ref. AMM TASK 73-21-50-400-041). 
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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 LPT ACTIVE CLEARANCE CONTROL SYSTEM - FAULT ISOLATION PROCEDURES

________________________________________________________________
 TASK 75-22-00-810-801
 Loss of the Feedback Signal from the LPTC Valve - Engine 1 - Channel A
 1. Possible Causes
_______________
 - LPTC 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 73-21-50-210-002 Visual Inspection of the Wiring Harnesses 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) AMM 73-21-60-400-001 Installation of the Electronic Control Unit (ECU) AMM 73-29-00-710-040 Operational Test of the FADEC on the Ground (with
 Engine non Motoring)
 AMM 75-22-10-000-002  Removal of the Low Pressure Turbine Active Clearance Control (LPTACC) Valve
 AMM 75-22-10-400-002  Installation of the Low Pressure Turbine Active
 Clearance Control (LPTACC) Valve

 3. Fault Confirmation
__________________
 A. Do the operational test of the FADEC 1A on the ground (with engine non R motoring) (Ref. AMM TASK 73-29-00-710-040).
 4. Fault Isolation
_______________
 A. The fault message is generated if the channel A signal is invalid, out of range.
 (1) If the failure message LPTC VLV, J11, ECU is not confirmed:
 (a) No maintenance action is required.
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 (2) If the failure message LPTC VLV, J11, ECU is not confirmed but is

 repetitive: R - disconnect the CJ11R harness (LPT-A) connector (located in the R right core compartment) from the LPTC valve and visually examine R the receptacles and the connectors for damaged pins or R contamination (Ref. AMM TASK 73-21-50-210-002).
R (a) If damage is found:
R - repair or replace as required.

R (b) If no damage is found:
　
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