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4. Fault Isolation
_______________
A. This failure message is triggered when there is a disagreement between channels A and B position signals from the HPTCC Valve or one or both signals is out of range.
(1) If the failure message HPTC VLV, J11, ECU and HPTC VLV, J12, ECU is not confirmed:
(a) No maintenance action required.
(2) If the failure message HPTC VLV, J11, ECU and 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, J11, ECU and HPTC VLV, J12, ECU is confirmed:
(a) Disconnect the harnesses HJ11 and HJ12 from the ECU and do a
R resistance check of the harnesses HJ11 and 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 harnesses CJ11R and 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)
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. pin 2 and the ground (> 10 Megohms) . pin 4 and the ground (> 10 Megohms) . pin 6 and the ground (> 10 Megohms).
NOTE : Tighten the connector by hand plus one eighth of a
____ turn. If necessary use soft nose pliers.
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).
R 4_If the resistance values are in the specified limits:
- disconnect the harnesses HJ11 and HJ12 from the harnesses CJ11R and CJ12R at the 6 o'clock junction box and do a check of the resistance of the harnesses CJ11R and CJ12R between:
- for harness CJ11R
. pins 29 and 30 (68 to 102 ohms)
. pins 18 and 31 (30 to 42 ohms)
. pins 16 and 28 (22 to 30 ohms)
. pins 29 and 17 (> 10 Megohms)
. pins 18 and 17 (> 10 Megohms)
. pins 16 and 17 (> 10 Megohms)
. pin 29 and the ground (> 10 Megohms)
. pin 18 and the ground (> 10 Megohms)
R . pin 16 and the ground (> 10 Megohms).
- for harness CJ12R
. 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)
R . 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)
R . pin 20 and the ground (> 10 Megohms).
a If the resistance values are in the specified limits:
_
- replace the harness HJ11 (Ref. AMM TASK 73-21-50-000-044) and (Ref. AMM TASK 73-21-50-400-044) and/or harness HJ12 (Ref. AMM TASK 73-21-50-000-045) and (Ref. AMM TASK 73-21-50-400-045).
R
R b_If the resistance values are not in the specified limits:
- replace the harness CJ11R (Ref. AMM TASK 73-21-50-000-026) and (Ref. AMM TASK 73-21-50-400-026) and/or harness CJ12R (Ref. AMM TASK 73-21-50-000-028) and (Ref. AMM TASK 73-21-50-400-028).
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