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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