- 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:
_

 - replace the HJ8 harness (Ref. AMM TASK 73-21-50-000-041) and (Ref. AMM TASK 73-21-50-400-041).
 B. Do the test given in Para. 3.A.
 (1) No additional maintenance action is required if the fault is not confirmed.

 (2) Repeat the fault isolation procedure if the fault continues.

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 Loss of the Feedback Signal of the N1 Speed Sensor - Engine 1 - Channel A
 1. Possible Causes
_______________

 - SENSOR-N1 ROTATIONAL SPD (4000EV)

 - ECU (4000KS)

 - HJ9 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 73-21-50-210-002 Visual Inspection of the Wiring Harnesses AMM 73-21-50-400-042 Installation of the HJ9 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)
 3. Fault Confirmation
__________________

 A. Do the operational test of the FADEC 1A on the ground (with engine non motoring) (Ref. AMM TASK 73-29-00-710-040).
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 4. Fault Isolation
_______________

 A. The failure message is generated if channel A and channel B inputs from R the N1 sensor disagree.
 (1) If the failure message N1 SNSR, J9, ECU* is not confirmed: R
R (a) No maintenance action is required.
 (2) If the failure message N1 SNSR, J9, ECU* is not confirmed but is repetitive:
 - disconnect HJ9 harness from the N1 sensor (N1-A connector).
R (a) Visually examine the receptacle and the connector for damaged R pins or contamination (Ref. AMM TASK 73-21-50-210-002).
 1 If damage is found:
_ - repair or replace as required.

 2 If no damage is found:
_

 - do a cleaning of the connector and receptacle using a bristle brush with stoddard solvent (Material No. CP2011) (Ref. AMM TASK 73-21-50-210-002).
R
R (b) If the failure continues during the subsequent flights:
 - replace the SENSOR-N1 ROTATIONAL SPD (4000EV) (Ref. AMM TASK
 77-11-10-000-002) and (Ref. AMM TASK 77-11-10-400-002). R
R (c) If the failure continues during the subsequent flights:
 - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and
 (Ref. AMM TASK 73-21-60-400-001). R
R (d) If the failure continues during the subsequent flights:
 - replace the HJ9 harness (Ref. AMM TASK 73-21-50-000-042) and (Ref. AMM TASK 73-21-50-400-042).
 (3) If the failure message N1 SNSR, J9, ECU* is confirmed: R - disconnect the HJ9 harness from the N1 sensor (N1-A connector).
R (a) Visually examine the receptacle and the connector for damaged R pins or contamination (Ref. AMM TASK 73-21-50-210-002).
 1 If damage is found:
_ - repair or replace as required.

 2 If no damage is found:
_ R - do the electrical resistance test through the N1 sensor R (4000EV) (channel A) between:
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