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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:
 (a) Disconnect the harness HJ12 from the ECU and do a resistance check of the harness 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 harness 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) . 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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R R R R R R R R R R  4_ If the resistance values are in the specified limits: - disconnect the harness HJ12 from the harness CJ12R at the 6 o'clock junction box and do a check of the resistance of the harness CJ12R between: . pins 16 and 6 (68 to 102 ohms) . pins 19 and 18 (30 to 42 ohms) . pins 20 and 8 (22 to 30 ohms) . pins 17 and 7 (> 10 Megohms) . pins 19 and 7 (> 10 Megohms) . pins 20 and 7 (> 10 Megohms) . pin 17 and the ground (> 10 Megohms) . pin 19 and the ground (> 10 Megohms) . pin 20 and the ground (> 10 Megohms).
R  a_ If the resistance values are in the specified limits: - replace the harness HJ12 (Ref. AMM TASK 73-21-50-000-045) and (Ref. AMM TASK 73-21-50-400-045). 
R  b_ If the resistance values are not in the specified limits: - replace the harness CJ12R (Ref. AMM TASK 73-21-50-000-028) and (Ref. AMM TASK 73-21-50-400-028).
 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 75-21-00-810-823
 Failure of the HPTCC Valve Channel B on Engine 1
 1. Possible Causes
_______________
 - TCC sensor(s)

 - High Pressure Turbine Clearance Control (HPTCC) Valve

 - Hydromechanical Unit (HMU)

 - ECU (4000KS)

 - harness HJ8

 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 73-21-50-000-041 Removal of the HJ8 Harness AMM 73-21-50-210-002 Visual Inspection of the Wiring Harnesses AMM 73-21-50-400-041 Installation of the HJ8 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
　
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