FMV Nullshift Bias Channel B

TASK 73-11-00-810-802-A
FMV Nullshift Bias Channel B

1. Possible Causes

INTEGRATED FUEL PUMP AND CONTROL [4360KS]
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 73-21-00-710-809	Test No.15 - Operation Test (Dry Motor) of the FADEC System Engine Actuators
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)
EEC Wiring Harnesses
Integrated Fuel Pump and Control Wiring Harnesses
Integrated Fuel Pump and Control Wiring Schematic

3. Fault Confirmation
Subtask 73-11-00-710-051-A ** ON A/C NOT FOR ALL

A. Do the FADEC system actuator test to confirm this fault AMM 73-21-00-710-809.

NOTE: The Electronic Engine Control (EEC) channel B has detected the Fuel Metering Valve (FMV) actuator Torque Motor (TM) on the Integrated Fuel Pump and Control (IFPC) requires more current to stay in position. This fault is usually an indication of a problem with the actuator TM or internal servo valve. The integrated fuel pump and control is mounted on the fuel manifold, 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 73-11-00-810-051-A ** ON A/C NOT FOR ALL

A. If there is confirmation of the fault:
(1) Replace INTEGRATED FUEL PUMP AND CONTROL [4360KS] AMM 73-11-01-000-801 and AMM 73-11-01-400-801.
(a) Do the test given in Para. 3.
(2) If the fault continues:
(a) Examine the W03 (4087KS) harness, connector P4 (4000KS-P4) - EEC (4000KS) and connector P16 (4360KS-P16) - integrated fuel pump and control (4360KS), for problems which are possible between the EEC (4000KS) and the integrated fuel pump and control (4360KS).
(b) Inspect for harness damage.
(c) Inspect for loose or damaged connectors.

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

(d) If a problem is found with the harness or connectors:
1 Replace W03 HARNESS [4087KS] AMM 73-21-63-000-802 and AMM 73-21-63-400-802, or
2 Do the test given in Para. 3.
(3) If no problems are found with the harness or the fault continue, use a PLIERS - JAWED, SOFT to disconnect the electrical connector P4 (4000KS-P4) from the EEC (4000KS) and connector P16 (4360KS-P16) from the integrated fuel pump and control (4360KS).
(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 connector P4 (4000KS-P4) to the EEC (4000KS) and connector P16 (4360KS-P16) to the integrated fuel pump and control (4360KS).
(d) Do the test given in Para. 3.
(4) If the fault continues:
(a) Disconnect the electrical connector P4 (4000KS-P4) from the EEC (4000KS) and connector P16 (4360KS-P16) from the integrated fuel pump and control (4360KS). Use a MULTIMETER - STANDARD to test the integrated fuel pump and control FMV TM circuits in the harness. Refer to Table 1. 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: Integrated Fuel Pump and Control FMV TM Channel B Connector Contacts

W03 (4087KS) Harness P4 (4000KS-P4) EEC (4000KS) Connector Contacts	W03 (4087KS) Harness P16 (4360KS-P16) Integrated Fuel Pump and Control (4360KS) Connector Contacts
U	23
r	24

(b) If a problem is found with the harness or connectors:
1 Replace W03 HARNESS [4087KS] AMM 73-21-63-000-802 and AMM 73-21-63-400-802.
2 Do the test given in Para. 3.
(5) 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 73-11-00-860-051-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.

[Rev.8 from Aug 2018] 2026.04.04 04:36:31 UTC