- 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 73-21-50-000-041 Removal of the HJ8 Harness AMM 73-21-50-210-002 Visual Inspection of the Wiring Harnesses 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 1B on the ground (with engine non motoring) (Ref. AMM TASK 73-29-00-710-040).
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 4. Fault Isolation
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 A. The failure message is generated if channel B input from the N2 sensor is invalid or out of range.
 (1) If the failure message N2 SNSR, J8, ECU* is not confirmed: R
R (a) No maintenance action is required.
 (2) If the failure message N2 SNSR, J8, ECU* is not confirmed but is repetitive:
 - disconnect HJ8 harness from the N2 sensor (N2-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).
 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).
R
R (b) If the failure continues during the subsequent flights:
 - replace the SENSOR-N2 ROTATIONAL SPD (4001EV) (Ref. AMM TASK
 77-11-20-000-002) and (Ref. AMM TASK 77-11-20-400-002). R
R (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). R
R (d) If the failure continues during the subsequent flights:
 - replace the HJ8 harness (Ref. AMM TASK 73-21-50-000-041) and (Ref. AMM TASK 73-21-50-400-041).
 (3) If the failure message N2 SNSR, J8, ECU* is confirmed: R - disconnect the HJ8 harness from the N2 sensor (N2-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).
 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:
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 . pins 1 and 2 (40 to 80 ohms)

 . 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 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
R (b) Disconnect the HJ8 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). R
 1 If damage is found:
_ - repair or replace as required.

 2 If no damage is found:
_

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