4. Fault Isolation
_______________

 A. The failure message is generated if channel A input from the N1 sensor is invalid or out of range.
 (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).
 (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).

 (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).

 (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:
 . pins 1 and 2 (40 to 80 ohms)
 for S/N different than 25451 and up:
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 . pins 1 and 3 (>5 kiloohms)

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

 for S/N 25451 and up: . pins 1 and 3 (>10 megohms)

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

 a If the resistance values are out of the specified limits:
_

 - replace the N1 sensor (4000EV) (Ref. AMM TASK 77-11-10-000-002) and (Ref. AMM TASK 77-11-10-400-002).
 b If the resistance values are in the specified limits:
_ R - connect the HJ9 harness to the N1 sensor.
R (b) Disconnect the HJ9 harness from the ECU (4000KS) and visually R examine the receptacle and the connector for damaged pins or R 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 HJ9 harness R between:
 . pins 16 and 17 (40 to 80 ohms)
 for S/N different than 25451 and up: . pins 16 and 6 (>5 kiloohms)
R . pin 16 and the ground (>10 megohms)

 for S/N 25451 and up: . pins 16 and 6 (>10 megohms)

R . pin 16 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 HJ9 harness (Ref. AMM TASK 73-21-50-000-042) and (Ref. AMM TASK 73-21-50-400-042).
 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 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 -------------------------------------------------------------------------------
　
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