On-Wing Non-Volatiles Memory (NVM) Retrieval from the Electronic Control Unit (ECU) [CFMB]

TASK 73-21-60-740-805-A
On-Wing Non-Volatiles Memory (NVM) Retrieval from the Electronic Control Unit (ECU)

ZONE: 210
ZONE: 400

1. Reason for the Job
This procedure is used to retrieve NVM data from the ECU to use for engine troubleshooting. You can retrieve NVM data with a Portable Data Loader (PDL) P/N YV68A110 or PDL P/N ALT45200001.

NOTE: This procedure will not erase NVM content or reprogram software in the ECU.

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

REFERENCE	QTY	DESIGNATION
No specific	1	WARNING NOTICE(S)
ALT45200001	1	PORTABLE DATA LOADER
YV68A110	1	PORTABLE DATA LOADER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
210	CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD
400	POWER PLANT, NACELLES AND PYLONS
FOR [1000EM1] (ENGINE-1)
437AL, 438AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 31-36-00-740-015-A	Printout of the Engine/APU Hours and Cycles Stored in the Flight Data Interface and Management Unit (FDIMU)
TASK 71-13-00-010-040-B	Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-B	Closing of the Fan Cowl Doors
TASK 73-21-60-740-006-A	Read the LRU Identification Report and the Thrust Reverser Shut-off Valve Status
TASK 73-29-00-710-040-B	Operational Test of the FADEC on the Ground (with Engine Motoring)
TASK 73-29-00-710-040-B-02	Operational Test of the FADEC on the Ground (with Engine Non motoring)

3. Job Set-up
Subtask 73-21-60-740-082-A ** ON A/C NOT FOR ALL

A. Do a print-out of the engine hours and cycles (Ref. AMM TASK 31-36-00-740-006) or (Ref. AMM TASK 31-36-00-740-015) and of the LRU IDENTIFICATION page of the MCDU (Ref. AMM TASK 73-21-60-740-006) and keep the print-out with the engine for follow-up.

NOTE: Some tasks will possibly not be applicable depending on whether a Data Management Unit (DMU) or a Flight Data Interface and Management Unit (FDIMU) are installed on the aircraft.

Subtask 73-21-60-941-082-A ** ON A/C NOT FOR ALL

B. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) in position to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is OFF.
(b) Put a WARNING NOTICE(S) in position to tell persons not to energize the FADEC 1(2).

Subtask 73-21-60-010-098-A ** ON A/C NOT FOR ALL

C. Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-040):
(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR

4. Procedure
Subtask 73-21-60-740-083-A ** ON A/C NOT FOR ALL

A. On-Wing NVM Data Retrieval
(1) Do these steps to prepare the diskette:

NOTE: The Sundstrand or Demo Systems PDL retrieval tool, P/N YV68A110), uses a diskette to store retrieved data and the Demo Systems ALT45200001 PORTABLE DATA LOADER, can use either a diskette or the PDL hard drive to store retrieved data.

(a) Get a diskette that is formatted for PC applications.
(b) Get the CD-ROM that came with the engine for the ECU.
(c) Use the CD-ROM instructions (Procedure for Making Working Copy Disks) to create a working diskette copy for each ECU.
(d) Install labels on the disks. Make sure that the labels are marked (Retrieve Only Data).
(e) If required, mark the ECU part number, the ECU serial number, and the engine serial number (ESN) on each floppy disk label.

NOTE: The ECU part number, the ECU serial number, and the engine serial number should be filled in when the working floppy disc copy is used.

(2) If you use a Sundstrand or Demo System YV68A110 PORTABLE DATA LOADER (PDL), refer to the steps in paragraph 4.A.(3) to retrieve NVM data. If you use the Demo Systems ALT45200001 PORTABLE DATA LOADER, refer to paragraph 4.A.(4) to retrieve NVM data.
(3) When you use a Sundstrand or Demo Systems YV68A110 PORTABLE DATA LOADER (PDL), do the steps that follow:
(a) Disconnect the engine rating and identification plug from the J14 connector of the ECU.
(b) Disconnect the aircraft cables from J2, J3, and J4 connectors on the ECU.
(c) Remove the protective cap from the J15 connector. Keep the cap.
(d) You can temporarily disconnect the cable connecting to the J1 connector to get access to the J3 connector.

NOTE: J1 cable must be reconnected to the ECU before data retrieval.

(e) Connect the ECU/PDL adapter cable to the receptacle of the PDL.
(f) Before you connect the adapter cable to the FADEC.
1 Touch the connector coupling nut of the PDL adapter, checking cables and connectors for accuracy.
2 Hold for one second to dissipate any potential electrical charge in the PDL.
(g) Connect the ECU adapter cable P2, P3, P4, P14, and P15 receptacles to the J2, J3, J4, J14 and J15 receptacles respectively on the ECU. You must connect the PC2 to the aircraft harness W2 (J2 harness cable).

NOTE: The ECU/PDL will be powered by aircraft (A/C) 28 volts direct current (VDC) supply via the J1 and J2 connectors.

(h) Connect the ECU/PDL adapter connector PC2 to the disconnected W2 A/C cable (J2 harness cable).
(i) Make sure that the diskette is not installed in the PDL.
(j) Apply power to the FADEC system (push FADEC GND PWR ENG X pushbutton switch to ON).

NOTE: After the ECU is initially powered, there is a five-minute time limit during which the data retrieval procedure can be initiated. Steps 4.A.(3)(j) through 4.A.(3)(l) must be completed within the five-minute time period. After the five-minute time limit has been reached, data retrieval is disabled. After this, power must be cycled on the ECU to re-enable the data retrieval mode.

(k) Turn the PDL on (PDL may also turn on automatically once power is applied to ECU).

NOTE: After the PDL is initialized, the Demo Systems PDL display will read DISK NOT INSERTED. The Sundstrand PDL will display RDY indication.

(l) Identify the ECU hardware part number per the CFM software Service Bulletin and insert the working copy of the data retrieval diskette into the PDL. It takes approximately five minutes per channel to retrieve data from each ECU.

NOTE: The PDL display messages shown in the procedures that follow are from a Demo Systems PDL. If you have a Sundstrand PDL, the display messages will be different in some cases. Below are the Demo Systems messages and their Sundstrand equivalents.

DEMO SYSTEMS	SUNDSTRAND EQUIVALENT
LOAD COMPLETE	COMP (illuminated in green)
TRANSFER FAIL	XFER (illuminated in red)
READ/WRITE FAIL	R/W (illuminated in red)

NOTE: It takes approximately five minutes per channel to retrieve data from an ECU. If the data retrieval fails initially, the PDL will attempt to retrieve data two more times. It may take an additional three to five minutes before the TRANSFER FAIL lamp illuminates.

NOTE: During the data retrieval procedure, the Demo Systems PDL display will show a numeric value that will count up from zero. The count-up sequence will occur twice, first for Channel A and again for Channel B.

(m) If a data retrieval error occurs, the Demo Systems PDL UNIT FAIL READ/WRITE FAIL or TRANSFER FAIL lamp illuminates. Also, the Sundstrand PDL No Load Complete indication will occur after 10 minutes. Remove the power from both channels of the ECU. Make sure that the cable connections are correct, cycle power OFF to the ECU and PDL, then do paragraph 4.A.(3)(j) through 4.A.(3)(l) again. If additional attempts are made with the same disk, the original NVM removed from the ECU during the first attempt and stored on the disk will be overwritten. To save the original NVM, use a new disk when additional attempts are made (or back-up diskette to separate location).
(n) If LOAD COMPLETE is displayed on the PDL, remove power from the ECU (FADEC GND PWR ENG X pushbutton switches ON legend is out).
(o) Remove the working copy disk from the PDL and keep retrieved data for archive.
(p) After making sure all power is OFF, remove the ECU/PDL adapter cable 856A1700G05 from the W2 (J2 harness cable), J2, J3, J4, J14, and J15 connectors.
(q) Remove the PDL adapter cable from the PDL.
(r) Skip paragraph 4.A.(5) and continue with the paragraph 4.A.(6).
(4) When using a Demo Systems ALT45200001 PORTABLE DATA LOADER, do the steps that follow:
(a) Disconnect the engine rating and identification plug from the J14 connector of the ECU.
(b) Disconnect the aircraft cables from J2, J3 and J4 on the ECU.
(c) Remove the protective cap from the J15 connector. Keep the cap.
(d) You can temporarily disconnect the cable connecting to J1 to get access to the connector J3.

NOTE: J1 cable must be reconnected to the ECU before data retrieval.

(e) Connect the ECU/PDL adapter cable to the receptacle on the PDL.
(f) Before you connect the adapter cable to the FADEC.
1 Touch the connector coupling nut of the PDL adapter, checking cables and connectors for accuracy.
2 Hold for one second to dissipate any potential electrical charge in the PDL.
(g) Connect the ECU adapter cable P2, P3, P4, P14, and P15 receptacles to the J2, J3, J4, J14 and J15 receptacles respectively on the ECU. You must connect the PC2 to the aircraft harness W2 (J2 harness cable).

NOTE: With the ALT45200001 PORTABLE DATA LOADER there are two ways you can retrieve NVM data from the ECU. The retrieval can be accomplished by the use of diskette or by the use of the PDL hard drive. To install software with a floppy disk, follow procedure 4.A.(4).(h). To install software by use of the PDL hard drive, follow procedure 4.A.(4).(i).

(h) The procedure that follows, must be used when the NVM data retrieval is accomplished with a diskette. Turn on the PDL with the diskette not inserted in the drive.

NOTE: The data retrieval process must be started within five minutes of restoring power to the ECU. After the five-minute limit has been reached, retrieval is disabled. After this, power must be cycled on the ECU to re-enable the retrieval mode.

1 Restore power to the FADEC system. Apply power to the FADEC system (push FADEC GND PWR X pushbutton switch to ON).
2 On the PDL, from the main menu, click the PDL615 DATALOADING button.
3 Insert the diskette in the disk drive and select Floppy Drive.
4 Complete the requested information, TYPE, LRU, Part Number, Operator and Tail No. Select START LOAD only after you make sure all of the information is correct.
5 On this screen, if the block count is not increasing from zero to 17, then the software is not being retrieved. One possible reason for this would be the five-minute window that the ECU allows could have elapsed. If this is the case, select the GO BACK tab to abort the process. When you do this, the program will return to step 1_. The ECU must then be recycled by pressing the FADEC button OFF and ON again. Select the Floppy Drive button as in step 3_ and continue.
6 The PDL will automatically retrieve the NVM data from the ECU. This can be verified on the PDL screen when the PWR ON and READY indicators are shown green. This retrieval process will take approximately 10 minutes. After the data is retrieved successfully, the PDL will indicate LOAD COMPLETE.

If the data retrieval is unsuccessful, FADEC GND PWR ENG X push-button switches ON legend is out, make sure that the cables between the PDL and the ECU are correctly installed. Do the retrieval procedure again.

7 After successful data retrieval, remove power from the ECU (FADEC GND PWR ENG X pushbutton switch ON legend is out).
8 Disconnect the PDL from the ECU and re-install the rating identification plug in the J14 receptacle of the ECU.
9 Connect the harness cables to the J2, J3 and J4 ECU receptacles.
10 Install the protective cap on the J15 ECU receptacle.
11 Continue with the paragraph 4.A.(6).
(i) The procedure that follows must be done when the NVM data retrieval is done with the ALT45200001 PORTABLE DATA LOADER hard drive. Turn the PDL on with the diskette not inserted in the drive.
1 On the ALT45200001 PORTABLE DATA LOADER, from the Main Menu, click the PDL615 DATALOADING button.
2 Click the ALT45200001 PORTABLE DATA LOADER Mass Storage button.
3 Select the correct TYPE, LRU, and Part Number. Make sure that the SELECT BY: MODEL option is chosen. Make sure that the correct selections have been made and click on SELECT. Then click on START 615 LOAD.
4 Make sure that the information on the screen is correct and fill in the Operator and Tail No. Do not click "START LOAD".

NOTE: The retrieval process must be started within five minutes of restoring power to the ECU. After the five-minute time limit has been reached, retrieval is disabled. After this, power must be cycled on the ECU to re-enable retrieval mode.

5 Restore power to the FADEC system.
6 Click on START LOAD on the ALT45200001 PORTABLE DATA LOADER.
7 The ALT45200001 PORTABLE DATA LOADER will automatically retrieve the NVM data from the ECU. This process will take approximately 10 minutes. The ALT45200001 PORTABLE DATA LOADER will display whether the retrieval was complete or unsuccessful at the end of this time. If the software retrieval is unsuccessful, FADEC GND PWR ENG X push-button switches ON legend is out, make sure that the cables between the ALT45200001 PORTABLE DATA LOADER and ECU are correctly installed, and then do the retrieval procedure again.
8 After the NVM data is retrieved successfully, remove power from the ECU (FADEC GND PWR ENG X pushbutton switch ON legend is out).
9 Disconnect the ALT45200001 PORTABLE DATA LOADER from the ECU and re-install the rating identification plug in the J14 receptacle of the ECU. Reconnect the cables to the receptacles J3, J4, and J15 ports.
10 Continue with the paragraph 4.A.(6).
(5) Restore power to the FADEC system.
(6) At the flight deck, generate the LRU IDENTIFICATION FADEC REPORT for the engine you just retrieved. Make sure that the ECU software part number corresponds to the software part number that is installed, P/N 2044M38PXX or 2459M16PXX (Ref. AMM TASK 73-21-60-740-006).
(7) Test after NVM retrieval of the ECU:
(a) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
(b) Do a LRU identification report (Ref. AMM TASK 73-21-60-740-006).
(8) Do an operational test of the FADEC system using the non-motoring FADEC system test (Ref. AMM TASK 73-29-00-710-040).
(9) After the FADEC system test, if a fault is present, get access to the troubleshooting report via the menu mode. Make sure that none of the faults below exists, and then print the test report.
(a) Fault message : Fault description

ECU (CPU FAULT) : ECU-CPU fault
ECU (NVM FAULT) : ECU-NVM fault

Subtask 73-21-60-860-086-A ** ON A/C NOT FOR ALL

B. Put the aircraft back to its initial configuration.
(1) On the overhead maintenance panel 50VU:
(a) Push the FADEC GND PWR 1(2) pushbutton switch. The ON legend goes off.

Subtask 73-21-60-862-077-A ** ON A/C NOT FOR ALL

C. De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

5. Close-up
Subtask 73-21-60-410-076-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 02:59:28 UTC