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R C. If the failure message ECU (A CHANNEL) is confirmed:
R - do a check of the J9 harness connection at the control alternator:

R (1) If the connection is loose:
R - tighten the connection by hand plus one eighth of a turn.

R NOTE : Soft nose pliers may be used if necessary.

____
R (2) If the connection is tight:
R - disconnect the J9 harness from the alternator stator (ALT-A)
R (located in the left core compartment).

R (a) Visually examine the alternator stator receptacle and the J9
R harness connector for damaged pins or contamination (Ref. AMM
R TASK 73-21-50-210-002).

R 1_ If harness or alternator stator connector is damaged:
R - repair or replace as required.

R 2_ If no damage is found:
R - do an electrical resistance test through the alternator
R stator connector between:

R . pins 2 and 5 (<1 Ohm)

R . pins 3 and 5 (<1 Ohm)

R . pins 4 and 5 (<1 Ohm)

R . pins 5 and the ground (>10 Megohms)

R 3_ If the resistance values are out of the specified limits:
R - replace the alternator stator (Ref. AMM TASK 73-21-30-000-R 001) and (Ref. AMM TASK 73-21-30-400-001).

R 4_ If the resistance values are in the specified limits:
R - reconnect the J9 harness to the alternator stator.
R - disconnect the J9 harness from the ECU (4000KS) receptacle.
R - Visually examine the ECU (4000KS) receptacle and the J9
R harness connector for damaged pins or contamination (Ref.
R AMM TASK 73-21-50-210-002).

R a_ If harness connector or ECU receptacle is damaged:
R - repair or replace as required.

R b_ If no damage is found:
R - do an electrical resistance test through the J9 harness
R between:

R . pins 5 and 13 (<1 Ohm)

R . pins 5 and 14 (<1 Ohm)

R . pins 5 and 15 (<1 Ohm)

R . pins 5 and 4 (>10 megohms)

R . pins 13 and 4 (>10 megohms)

R . pins 14 and 4 (>10 megohms)

R . pins 15 and 4 (>10 megohms)

R . pin 5 and the ground (>10 megohms)

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R 
R  * If the resistance values are out of the specified 
R  limits: 
R  - replace the J9 harness (Ref. AMM TASK 73-21-50-000-042) 
R  and (Ref. AMM TASK 73-21-50-400-042). 
R 
R  * If the resistance values are in the specified limits: 
R  - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-
R  001) and (Ref. AMM TASK 73-21-60-400-001). 
R  D. 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 77-10-00-810-842
 Loss of the ECU Cross Channel on Engine 2 - Channel A
 1. Possible Causes
_______________
R R - Alternator Stator R - Accessory Gearbox Assembly R - Alternator Rotor R - J9 Harness R - ECU (4000KS)
 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
R  AMM 72-63-00-000-003  Removal of the Accessory Gearbox Assembly 
R  AMM 72-63-00-400-003  Installation of the Accessory Gearbox Assembly 
R  AMM 73-21-30-000-001  Removal of the Control Alternator 
R  AMM 73-21-30-400-001  Installation of the Control Alternator 
R  AMM 73-21-50-000-042  Removal of the HJ9 Harness 
R  AMM 73-21-50-210-002  Visual Inspection of the Wiring Harnesses 
R  AMM 73-21-50-400-042  Installation of the HJ9 Harness 
　
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