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 4. Fault Isolation
_______________
 A. The failure message is triggered if there is a difference between the actual position and the feedback position of the valve of more than 5% and the fault continues for more than 7 seconds.
 (1) If the failure message HPTC VLV (POS), HMU on channel 2A, on both channels is not confirmed:

 (a) No maintenance action required.

 (2) If the failure message HPTC VLV (POS), HMU on channel 2A, on one or both channels is not confirmed but is repetitive:

 (a) Do the following trouble shooting at next maintenance opportunity:
 1 Do a check of the Post Flight Report (PFR) and the Schedule
_ Maintenance Report (SMR)/Class 3 report for TCC SNSR, HJ13, ECU. If the failure message is present:
R  - disconnect the TCC sensor(s).
 NOTE : Engines post SB 73-046 are equipped with only one
____
 sensor.

 - Do a cleaning of the harness connectors and receptacles
R  using a bristle brush with stoddart solvent (CP 2011) (Ref. AMM TASK 73-21-50-210-002).
 - reconnect the connectors to the TCC sensor(s).
 NOTE : Tighten the connector by hand plus one eighth of a
____ turn. If necessary use soft nose pliers.
 a If the fault continues:
_
 - replace the TCC sensor(s) (Ref. AMM TASK 73-21-70-000-002) and (Ref. AMM TASK 73-21-70-400-002).
 NOTE : Engines post SB 73-046 are equipped with only one
____ sensor.
 2 If the fault continues:
_
 - 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).
 3 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).
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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 2A 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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