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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 75-21-00-810-812
Loss of the Feedback Signal on the Channel B of the HPTCC Valve on Engine 2
1. Possible Causes
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- High Pressure Turbine Clearance Control (HPTCC) Valve
- ECU (4000KS)
- harness HJ12
- harness CJ12R
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 73-21-50-000-028 Removal of the CJ12R Harness AMM 73-21-50-000-045 Removal of the HJ12 Harness AMM 73-21-50-400-028 Installation of the CJ12R Harness AMM 73-21-50-400-045 Installation of the HJ12 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 2 on the ground with engine non motoring (Ref. AMM TASK 73-29-00-710-040).
4. Fault Isolation
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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, J12, ECU is not confirmed:
(a) No maintenance action required.
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