HPSOV Position Disagreement Failure

TASK 73-11-00-810-818-A
HPSOV Position Disagreement Failure

1. Possible Causes

INTEGRATED FUEL PUMP AND CONTROL [4360KS]
W04 HARNESS [4088KS]
WC08 HARNESS-CORE [4094KS]
W03 HARNESS [4087KS]
[4000KS]

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	MULTIMETER - STANDARD
No specific	1	PLIERS - JAWED, SOFT

B. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 71-00-00-810-834-A	General Troubleshooting Guidelines for Additional Troubleshooting Information
TSM TASK 71-00-00-810-835-A	Component and Harness Intermittent Troubleshooting Procedure for Guidance Troubleshooting Intermittent Faults
AMM 70-70-00-910-803	SPOP 6 - Cleaning of the Contact Points and Wiring Harnesses
AMM 73-11-01-000-801	Removal of the Integrated Fuel Pump and Control (IFPC)
AMM 73-11-01-400-801	Installation of the Integrated Fuel Pump and Control (IFPC)
AMM 73-21-00-710-806	Test No.7 - EEC Operation Test (Self Test)
AMM 73-21-01-000-801	Removal of the Electronic Engine Control (EEC)
AMM 73-21-01-400-801	Installation of the Electronic Engine Control (EEC)
AMM 73-21-63-000-802	Removal of the Electronic Engine Control (EEC) Wiring Harness (W03)
AMM 73-21-63-400-802	Installation of the Electronic Engine Control (EEC) Wiring Harness (W03)
AMM 73-21-64-000-802	Removal of the Electronic Engine Control (EEC) Wiring Harness (W04)
AMM 73-21-64-400-802	Installation of the Electronic Engine Control (EEC) Wiring Harness (W04)
AMM 73-21-68-000-802	Removal of the EEC Wiring Harness (WC08)
AMM 73-21-68-400-802	Installation of the EEC Wiring Harness (WC08)
AMM 78-36-00-010-802	Opening of the Thrust Reverser Cowl-Doors
AMM 78-36-00-410-802	Closing of the Thrust Reverser Cowl-Doors
EEC Wiring Harnesses
W04/WC08 Wiring Harness Interconnect
Integrated Fuel Pump and Control Wiring Harnesses
Integrated Fuel Pump and Control Channel A Wiring Schematic
Integrated Fuel Pump and Control Channel B Wiring Schematic

3. Fault Confirmation
Subtask 73-11-00-710-069-A ** ON A/C NOT FOR ALL

A. Do the EEC system interactive test to confirm this fault. Refer to FADEC self test AMM 73-21-00-710-806.

NOTE: The Electronic Engine Control (EEC) detected the proximity sensor signal circuit for the fuel Shutoff Valve (HPSOV) in the Integrated Fuel Pump and Control (IFPC) from channel A and channel B do not agree. The integrated fuel pump and control is mounted on the top of the main gearbox at the 4 o'clock position.

Refer to the general troubleshooting guidelines for additional troubleshooting information (Ref. TSM TASK 71-00-00-810-834).
Refer to the component and harness intermittent troubleshooting procedure for guidance troubleshooting intermittent faults (Ref. TSM TASK 71-00-00-810-835).

(1) If the maintenance message does not come back, examine the harnesses and electrical connectors as described in the component and harness intermittent fault isolation procedure (Ref. TSM TASK 71-00-00-810-835).
(a) If no problems are found, return the engine to service. Monitor the engine for reoccurring maintenance messages. Examine the harness and electrical connectors as described in the guidelines for intermittent component and harness maintenance message troubleshooting (Ref. TSM TASK 71-00-00-810-835).
(2) If the maintenance message comes back (hard fault), go to the Para. Fault Isolation.

4. Fault Isolation

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AFTER SHUTDOWN. THE ENGINE CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS WARNING, INJURY CAN OCCUR.

WARNING: REFER TO THE MSDS FOR ALL MATERIAL USED AND THE MANUFACTURER'S SAFETY INSTRUCTIONS FOR ALL EQUIPMENT USED. IF YOU DO NOT OBEY THIS WARNING, INJURY CAN OCCUR.

CAUTION: MAKE SURE YOU REMOVE ELECTRICAL POWER FROM THE EEC BEFORE YOU REMOVE THE ELECTRICAL CONNECTORS. IF YOU DO NOT OBEY THIS INSTRUCTION, DAMAGE TO THE EEC CAN OCCUR.

Subtask 73-11-00-810-067-A ** ON A/C NOT FOR ALL

A. If there is confirmation of the fault:
(1) Open the thrust reverser cowl-doors AMM 78-36-00-010-802.
(2) Examine the W03 (4087KS), W04 (4088KS) and WC08 (4094KS) harnesses and connectors P13 (4000KS-P13) and P14 (4000KS-P14) - EEC (4000KS), interconnect J108 (4111VC)/P108 (4111VC-A) and connectors P16 (4360KS-P16) and P15 (4360KS-P15) - integrated fuel pump and control (4360KS), for problems which are possible between the EEC (4000KS) and the integrated fuel pump and control (4360KS).
(a) Examine for harness damage.
(b) Examine for loose or damaged connectors.

NOTE: Loose connectors must be disconnected and examined for more wear or damage.

(c) If a problem is found with the harnesses or connectors:
1 Replace W03 HARNESS(4087KS) AMM 73-21-63-000-802 and AMM 73-21-63-400-802, or
2 Replace W04 HARNESS(4088KS) AMM 73-21-64-000-802 and AMM 73-21-64-400-802, or
3 Replace WC08 HARNESS-CORE(4094KS) AMM 73-21-68-000-802 and AMM 73-21-68-400-802.
4 Do the test given in Para. 3.
(3) If no problems are found with the harnesses or the connectors, use a PLIERS - JAWED, SOFT to disconnect the electrical connectors P13 (4000KS-P13) and P14 (4000KS-P14) from the EEC (4000KS), interconnect J108 (4111VC)/P108 (4111VC-A) and connectors P16 (4360KS-P16) and P15 (4360KS-P15) from the integrated fuel pump and control (4360KS).
(a) Examine the pins and sockets (contacts) for alignment and damage. Look for contacts pushed into the connector face. Replace parts as necessary.
(b) Clean the contacts with contact cleaner and clean cloth per SPOP 6. Blow dry with air (at less than 30 psi) across the connector face AMM 70-70-00-910-803.
(c) Reconnect the electrical connectors P13 (4000KS-P13) and P14 (4000KS-P14) to the EEC (4000KS), interconnect J108 (4111VC)/P108 (4111VC-A) and connectors P16 (4360KS-P16) and P15 (4360KS-P15) to the integrated fuel pump and control (4360KS).
(d) Do the test given in Para. 3.
(4) If the fault continues:
(a) Replace INTEGRATED FUEL PUMP AND CONTROL [4360KS] AMM 73-11-01-000-801 and AMM 73-11-01-400-801.
(b) Do the test given in Para. 3.
(5) If the fault continues:
(a) Disconnect the electrical connectors P13 (4000KS-P13) and P14 (4000KS-P14) from the EEC (4000KS), interconnect J108 (4111VC)/P108 (4111VC-A) and connectors P16 (4360KS-P16) and P15 (4360KS-P15) from the integrated fuel pump and control (4360KS). Use a MULTIMETER - STANDARD to do a test of the integrated fuel pump and control (4360KS) HPSOV proximity sensor circuits in the harnesses. Refer to Table 1 and Table 2. Look for:
1 Wire-to-wire shorts
2 Shorts to ground
3 Continuity (less than 5 ohms resistance).

NOTE: A short to ground is found when the resistance is less than 100 000 (100K) ohms.

Table 1: IFPC HPSOV Proximity Sensor Channel A Connector Contacts

W04 (4088KS) Harness P13 (4000KS-P13) EEC (4000KS) Connector Contacts	W04 (4088KS) Harness J108 (4111VC) Connector Contacts	WC08 (4094KS) Harness P108 (4111VC-A) Connector Contacts	WC08 (4094KS) Harness P15 (4360KS-P15) IFPC (4360KS) Connector Contacts
d	24	24	9
B	25	25	20
C	26	26	10
D	27	27	21

Table 2: IFPC HPSOV Proximity Sensor Channel B Connector Contacts

W03 (4087KS) Harness P14 (4000KS-P14) EEC (4000KS) Connector Contacts	W03 (4087KS) Harness P16 (4360KS-P16) IFPC (4360KS) Connector Contacts
d	9
B	20
C	10
D	21

(b) If a problem is found with the harnesses or connectors:
1 Replace W04 HARNESS [4088KS] AMM 73-21-64-000-802 and AMM 73-21-64-400-802, or
2 Replace WC08 HARNESS-CORE [4094KS] AMM 73-21-68-000-802 and AMM 73-21-68-400-802, or
3 Replace W03 HARNESS [4087KS] AMM 73-21-63-000-802 and AMM 73-21-63-400-802.
4 Do the test given in Para. 3.
(6) If the fault continues:
(a) Replace [4000KS] AMM 73-21-01-000-801 and AMM 73-21-01-400-801.
(b) Do the test given in Para. 3.

5. Close-up
Subtask 73-11-00-860-067-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) Make sure that the work area is clean and clear of tools and other items.
(a) Close the thrust reverser cowl-doors AMM 78-36-00-410-802.

[Rev.8 from Aug 2018] 2026.04.04 04:36:34 UTC