Fuel Filter Delta Pressure Sensor Signal Disagreement

TASK 73-34-00-810-805-A
Fuel Filter Delta Pressure Sensor Signal Disagreement

1. Possible Causes

FUEL FILTER DIFF PRESS SENSOR [4002KS]
W03 HARNESS [4087KS]
W04 HARNESS [4088KS]
WC08 HARNESS-CORE [4094KS]
[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 73-21-00-710-806	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 73-34-21-000-801	Removal of the Fuel Filter Differential Pressure Sensor
AMM 73-34-21-400-801	Installation of the Fuel Filter Differential Pressure Sensor
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
W03/W04 Interconnect Wiring Harness
W04/WC08 Interconnect Wiring Harness
Fuel Filter Differential Pressure Sensor Wiring Harness
Fuel Filter Differential Pressure Sensor Wiring Schematic

3. Fault Confirmation
Subtask 73-34-00-710-054-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) has detected the circuit for the fuel filter Differential Pressure (DP) sensor do not agree between channel A and B. The fuel filter differential pressure sensor is located on the fuel manifold, attached to the main gearbox located at the 3 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 message.
(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 73-34-00-810-055-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, connectors P3 (4000KS-P3), P4 (4000KS-P4) - EEC (4000KS), interconnect P107 (4101VC-A)/J107 (4101VC), interconnect J109 (4112VC)/P109 (4112VC-A), interconnect J108 (4111VC)/P108 (4111VC-A) and connector P34 (4002KS-P34) - fuel filter differential pressure sensor (4002KS), for problems which are possible between the EEC (4000KS) and the fuel filter differential pressure sensor (4002KS).
(a) Inspect for harness damage.
(b) Inspect for loose or damaged connectors.

NOTE: Loose connectors must be disconnected and examined for further 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, use a PLIERS - JAWED, SOFT to disconnect the electrical connectors P3 (4000KS-P3), P4 (4000KS-P4) from the EEC (4000KS), interconnect P107 (4101VC-A)/J107 (4101VC), interconnect J109 (4112VC)/P109 (4112VC-A), interconnect J108 (4111VC)/P108 (4111VC-A) and connector P34 (4002KS-P34) from the fuel filter differential pressure sensor (4002KS).
(a) Examine the pins and sockets (contacts) for alignment and damage. Look for contacts pushed rearward 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 P3 (4000KS-P3) and P4 (4000KS-P4) to the EEC (4000KS), interconnect P107 (4101VC-A)/J107 (4101VC), interconnect J109 (4112VC)/P109 (4112VC-A), interconnect J108 (4111VC)/P108 (4111VC-A) and connector P34 (4002KS-P34) to the fuel filter differential pressure sensor (4002KS).
(d) Do the test given in Para. 3.
(4) If the fault continues:
(a) Replace FUEL FILTER DIFF PRESS SENSOR [4002KS] AMM 73-34-21-000-801 and AMM 73-34-21-400-801.
(b) Do the test given in Para. 3.
(5) If the fault continues:
(a) Disconnect the electrical connectors P3 (4000KS-P3) and P4 (4000KS-P4) from the EEC (4000KS), interconnect P107 (4101VC-A)/J107 (4101VC), interconnect J109 (4112VC)/P109 (4112VC-A), interconnect J108 (4111VC)/P108 (4111VC-A) and connector P34 (4002KS-P34) from the fuel filter differential pressure sensor (4002KS). Use a MULTIMETER - STANDARD to test the fuel filter differential pressure sensor channel A and B 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: Fuel Filter Differential Pressure Sensor Channel A Circuit Connector Contacts

W04 (4088KS) Harness P3 (4000KS-P3) EEC (4000KS) Connectot Contacts	W04 (4088KS) Harness J108 (4111VC) Connector Contacts	WC08 (4094KS) Harness P108 (4111VC-A) Connector Contacts	WC08 (4094KS) Harness P34 (4002KS-P34) Fuel Filter DP Sensor (4002KS) Connector Contacts
w	28	28	12
x	29	29	4
d	30	30	3
e	31	31	11

Table 2: Fuel Filter Differential Pressure Sensor Channel B Circuit Connector Contacts

W03(4087KS) Harness P4 (4000KS-P4) EEC(4000KS) Connector Contacts	W03(4087KS) Harness P107 (4101VC-A) Connector Contacts	W04(4088KS) Harness J107 (4101VC) Connector Contacts	W04(4088KS) Harness J109 (4112VC) Connector Contacts	WC08(4094KS) Harness P109 (4112VC-A) Connector Contacts	WC08(4094KS) Harness P34 (4002KS-P34) Fuel Filter DP Sensor(4002KS) Connector Contacts
w	21	21	8	8	9
x	22	22	9	9	8
d	40	40	10	10	7
e	41	41	11	11	6

(b) 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.
(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 73-34-00-860-050-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 04:40:58 UTC