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

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

R . pins 1 and 2 (40 to 80 ohms) R R for S/N different than 25451 and up

R . pins 1 and 3 (>5 kiloohms)

R . pin 1 and the ground (>10 megohms) R R for S/N 25451 and up

R . pins 1 and 3 (>10 megohms)

R . pin 1 and the ground (>10 megohms).

R a_ If the resistance values are out of the specified limits:
R - replace the N1 sensor (4000EV) (Ref. AMM TASK 77-11-10-R 000-002) and (Ref. AMM TASK 77-11-10-400-002).

R b_ If the resistance values are in the specified limits:
R - connect the HJ10 harness to the N1 sensor.

R (b) Disconnect connector HJ10 from the ECU (4000KS) receptacle and
R visually examine the receptacles and the connectors 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 the electrical resistance test through the J10 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).

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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 HJ10 harness (Ref. AMM TASK 73-21-50-000-043) 
R  and (Ref. AMM TASK 73-21-50-400-043). 
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 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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