- replace the HJ7 harness (Ref. AMM TASK 73-21-50-000-040) and (Ref. AMM TASK 73-21-50-400-040).
 (4) If the failure message N2 SNSR, J8, ECU is confirmed:
 - disconnect the HJ8 harness from the N2 sensor (N2-B connector).
R (a) Visually examine the receptacles and the connectors 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 N2 sensor R (4001EV) (channel B) between:
 . pins 1 and 2 (40 to 80 ohms) . pins 1 and 3 (>10 megohms)
R . pin 1 and the ground (>10 megohms).
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 a If the resistance values are out of the specified limits:

_

 - replace the N2 sensor (4001EV) (Ref. AMM TASK 77-11-20-000-002) and (Ref. AMM TASK 77-11-20-400-002).
 b If the resistance values are in the specified limits:
_ R - connect the HJ8 harness to the N2 sensor.
R (b) Disconnect connector HJ8 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).
 1 If damage is found:
_ - repair or replace as required.

 2 If no damage is found:
_

 - do the electrical resistance test through the HJ8 harness between: . pins 2 and 11 (40 to 80 ohms) . pins 2 and 3 (>10 megohms)
R . pin 2 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:
_

 - 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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 TASK 77-10-00-810-820

 Loss of N2 Feedback Signal - Engine 2 - Channel A and Channel B
 1. Possible Causes
_______________

 - SENSOR-N2 ROTATIONAL SPD (4001EV)

 - ECU (4000KS)

 - HJ7 harness

 - HJ8 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 73-21-50-000-040 Removal of the HJ7 Harness AMM 73-21-50-000-041 Removal of the HJ8 Harness AMM 73-21-50-210-002 Visual Inspection of the Wiring Harnesses AMM 73-21-50-400-040 Installation of the HJ7 Harness AMM 73-21-50-400-041 Installation of the HJ8 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 77-11-20-000-002 Removal of the N2 Speed Sensor (4001EV).
 AMM 77-11-20-400-002 Installation of the N2 Speed Sensor (4001EV).

 3. Fault Confirmation
__________________

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