3. Fault Confirmation
__________________
 A. Not applicable.
 4. Fault Isolation
_______________
 A. If the fault symptom is identified by the maintenance message ALT, ECU, J10: NOTE 1 : In the usual operating condition, a fault of the harness J10 is detected with the test of the channel B. NOTE 2 : When a cross channel fault occurs, the harness fault is detected during the test on the opposite channel.
 NOTE 3 : For the trouble shooting, do the procedure for the plug which is shown on the fault message and not the channel which is given at the end of the post flight report.
 - do a check for open or short to ground of the harness J10 between the ECU (4000KS) and the control alternator pins J10/4, 5, 13, 14, 15 to pins J10/2, 3, 4, 5 (Ref. ASM 73-25/18).
 (1) If the wiring is not correct:
 - repair the above wiring.
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E F 『 E C F M E E E E 56 E E E (2) If the wiring is correct:

 - disconnect the harness J10 from the ECU (4000KS) and do a check of the ECU cable resistance between: . pins 5 and 13 (< 1 Ohm) . pins 5 and 14 (< 1 Ohm) . pins 5 and 15 (< 1 Ohm) . pins 5 and 4 (> 10 Megohms) . pin 5 and the ground (> 10 Megohms).
 (a) If the resistance values are in the specified limits:

 - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).

 (b) If the resistance values are out of the specified limits:

 - disconnect the harness J10 from the control alternator and do a check of the alternator resistance between: . pins 2 and 5 (< 1 Ohm) . pins 3 and 5 (< 1 Ohm) . pins 4 and 5 (< 1 Ohm) . pin 5 and the ground (> 10 Megohms).
 1 If the resistance values are in the specified limits:
_
 - replace the harness J10 (Ref. AMM TASK 73-21-50-000-043) and (Ref. AMM TASK 73-21-50-400-043).
 2 If the resistance values are out of the specified limits:
_
 - replace the control alternator (Ref. AMM TASK 73-21-30-000-001) and (Ref. AMM TASK 73-21-30-400-001).
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ER **ON A/C ALL

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 TASK 77-10-00-810-813
 Loss of N1 Feedback Signal - Engine 1 - Channel A and Channel B
 1. Possible Causes
_______________
 - SENSOR-N1 ROTATIONAL SPD (4000EV)

 - ECU (4000KS)

 - HJ9 harness

 - HJ10 harness

 2. Job Set-up Information
______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific  bristle brush
 B. Consumable Materials
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
Material No. CP2011  *
 stoddard solvent (Ref. 70-30-00)

 C. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 73-21-50-000-042 Removal of the HJ9 Harness AMM 73-21-50-000-043 Removal of the HJ10 Harness AMM 73-21-50-210-002 Visual Inspection of the Wiring Harnesses AMM 73-21-50-400-042 Installation of the HJ9 Harness AMM 73-21-50-400-043 Installation of the HJ10 Harness 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 non Motoring)
 AMM 77-11-10-000-002 Removal of the N1 Speed Sensor (4000EV)
 AMM 77-11-10-400-002 Installation of the N1 Speed Sensor (4000EV)

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E 3. Fault Confirmation

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