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R  - do the electrical resistance test through the HJ9 harness 
R  between: 
R  . pins 16 and 17 (40 to 80 ohms) 
R 
R  for S/N different than 25451 and up: 
R  . pins 16 and 6 (>5 kiloohms) 
R  . pin 16 and the ground (>10 megohms) 
R 
R  for S/N 25451 and up: 
R  . pins 16 and 6 (>10 megohms) 
R  . pin 16 and the ground (>10 megohms). 
R  a_  If the resistance values are in the specified limits:
R  - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) 
R  and (Ref. AMM TASK 73-21-60-400-001). 
R  b_  If the resistance values are out of the specified limits:
R  - replace the HJ9 harness (Ref. AMM TASK 73-21-50-000-042) 
R  and (Ref. AMM TASK 73-21-50-400-042). 
R
 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 2 - Channel B
 1. Possible Causes
_______________

 - SENSOR-N1 ROTATIONAL SPD (4000EV)

 - ECU (4000KS)

 - 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 73-21-50-000-043 Removal of the HJ10 Harness AMM 73-21-50-210-002 Visual Inspection of the Wiring Harnesses 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)
 3. Fault Confirmation
__________________

 A. Do the operational test of the FADEC 2B on the ground (with engine non motoring) (Ref. AMM TASK 73-29-00-710-040).
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 4. Fault Isolation
_______________

R A. The failure message is generated if channel A and channel B inputs from
R the N1 sensor disagree.

R (1) If the failure message N1 SNSR, J10, ECU* is not confirmed:

R (a) No maintenance action is required.

R (2) If the failure message N1 SNSR, J10, ECU* is not confirmed but is
R repetitive:
R - disconnect HJ10 harness from the N1 sensor (N1-B connector).

R (a) Visually examine the receptacle and the connector for damaged
R pins or contamination (Ref. AMM TASK 73-21-50-210-002).

R 1_ If damage is found:
R - repair or replace as required.

R 2_ If no damage is found:
R - do a cleaning of the connector and receptacle using a
R bristle brush with stoddard solvent (Material No. CP2011)
R (Ref. AMM TASK 73-21-50-210-002).

R (b) If the failure continues during the subsequent flights:
R - replace the SENSOR-N1 ROTATIONAL SPD (4000EV) (Ref. AMM TASK
R 77-11-10-000-002) and (Ref. AMM TASK 77-11-10-400-002).

R (c) If the failure continues during the subsequent flights:
R - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and
R (Ref. AMM TASK 73-21-60-400-001).

R (d) If the failure continues during the subsequent flights:
R - replace the HJ10 harness (Ref. AMM TASK 73-21-50-000-043) and
R (Ref. AMM TASK 73-21-50-400-043).
　
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