Loss of the Feedback Signal on Channel A of the HPTCC Valve on Engine 2

TASK 75-21-00-810-810-A
Loss of the Feedback Signal on Channel A of the HPTCC Valve on Engine 2

1. Possible Causes

High Pressure Turbine Clearance Control (HPTCC) Valve
ECU [4000KS]
harness J11
harness CJ11R
harness HJ11

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 73-21-50-000-002	Removal of the CJ11R Harness
AMM 73-21-50-000-010	Removal of the J11 Harness
AMM 73-21-50-000-026	Removal of the CJ11R Harness for SAC Engines
AMM 73-21-50-000-044	Removal of the HJ11 Harness for SAC Engines
AMM 73-21-50-400-002	Installation of the CJ11R Harness
AMM 73-21-50-400-010	Installation of the J11 Harness
AMM 73-21-50-400-026	Installation of the CJ11R Harness for SAC Engines
AMM 73-21-50-400-044	Installation of the HJ11 Harness for SAC Engines
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 Motoring)
AMM 75-21-10-000-001	Removal of the High Pressure Turbine Active Clearance Control (HPTACC) Valve
AMM 75-21-10-000-002	Removal of the High Pressure Turbine Active Clearance Control (HPTACC) Valve
AMM 75-21-10-400-001	Installation 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
Subtask 75-21-00-710-068-A ** ON A/C NOT FOR ALL

A. Test
(1) Do the operational test of the FADEC 2 on the ground with engine non motoring AMM 73-29-00-710-040.

4. Fault Isolation
Subtask 75-21-00-810-063-A ** ON A/C NOT FOR ALL

A. This failure message is triggered when there is a disagreement between channels A and B position signals from the HPTCC Valve or the signal is out of range.
(1) If the failure message HPTC VLV, J11, ECU is not confirmed:
(a) No maintenance action required.
(2) If the failure message HPTC VLV, J11, 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 AMM 75-21-10-000-001 and AMM 75-21-10-400-001.

1 If the fault continues:

replace the ECU [4000KS] AMM 73-21-60-000-001 and AMM 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 is confirmed:
(a) Disconnect the harness J11 from the ECU and do a resistance check of the harness J11 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)
. pin 16 and the ground (> 10 Megohms).
1 If the resistance values are in the specified limits:

replace the ECU [4000KS] AMM 73-21-60-000-001 and AMM 73-21-60-400-001.

2 If the resistance values are not in the specified limits:

disconnect the harness CJ11R 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).

3 If the resistance values are not in the specified limits:

replace the High Pressure Turbine Clearance Control (HPTCC) Valve AMM 75-21-10-000-001 and AMM 75-21-10-400-001.

4 If the resistance values are in the specified limits:

disconnect the harness J11 from the harness CJ11R at the 6 o'clock junction box and do a check of the resistance of the harness CJ11R between:
. 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)
. pin 16 and the ground (> 10 Megohms).

a If the resistance values are in the specified limits:

replace the harness J11 AMM 73-21-50-000-010 and AMM 73-21-50-400-010.

b If the resistance values are not in the specified limits:

replace the harness CJ11R AMM 73-21-50-000-002 and AMM 73-21-50-400-002.

NOTE: Tighten the connector by hand plus one eighth of a turn. If necessary use soft nose pliers.

Subtask 75-21-00-810-063-B ** ON A/C NOT FOR ALL

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 is not confirmed:
(a) No maintenance action required.
(2) If the failure message HPTC VLV, J11, 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 AMM 75-21-10-000-002 and AMM 75-21-10-400-002.

1 If the fault continues:

replace the ECU [4000KS] AMM 73-21-60-000-001 and AMM 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 is confirmed:
(a) Disconnect the harness HJ11 from the ECU and do a resistance check of the harness HJ11 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)
. pin 16 and the ground (> 10 Megohms).
1 If the resistance values are in the specified limits:

replace the ECU [4000KS] AMM 73-21-60-000-001 and AMM 73-21-60-400-001.

2 If the resistance values are not in the specified limits:

disconnect the harness CJ11R from the HPTCC Valve and do a resistance check of the HPTCC Valve between:
. pins 2 and 3 (65 to 99 Ohms)
. pins 4 and 5 (23 to 40 Ohms)
. pins 6 and 7 (18 to 29 Ohms)
. pin 2 and the ground (> 10 Megohms)
. pin 4 and the ground (> 10 Megohms)
. pin 6 and the ground (> 10 Megohms).

3 If the resistance values are not in the specified limits:

replace the High Pressure Turbine Clearance Control (HPTCC) Valve AMM 75-21-10-000-002 and AMM 75-21-10-400-002.

4 If the resistance values are in the specified limits:

disconnect the harness HJ11 from the harness CJ11R at the 6 o'clock junction box and do a check of the resistance of the harness CJ11R between:
. 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)
. pin 16 and the ground (> 10 Megohms).

a If the resistance values are in the specified limits:

replace the harness HJ11 AMM 73-21-50-000-044 and AMM 73-21-50-400-044.

b If the resistance values are not in the specified limits:

replace the harness CJ11R AMM 73-21-50-000-026 and AMM 73-21-50-400-026.

NOTE: Tighten the connector by hand plus one eighth of a turn. If necessary use soft nose pliers.

Subtask 75-21-00-710-069-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.
(1) No additional maintenance action is required if the fault is not confirmed.
(2) Continue the fault isolation procedure if the fault continues.

[Rev.8 from Aug 2018] 2026.04.04 04:37:01 UTC