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 77-10-00-810-847
 Loss of the ECU Cross Channel on Engine 1 - Channel B
 1. Possible Causes
_______________
R R - Alternator Stator R - Accessory Gearbox Assembly R - Alternator Rotor R - J10 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 73-21-50-000-043  Removal of the HJ10 Harness 
R  AMM 73-21-50-210-002  Visual Inspection of the Wiring Harnesses 
R  AMM 73-21-50-400-043  Installation of the HJ10 Harness 
R  AMM 73-21-60-000-001  Removal of the Electronic Control Unit (ECU) 
R  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) 
R  AMM 79-00-00-281-002  Check of the Electrical Master Chip Detector for 
R  Particles
 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).
 4. Fault Isolation
_______________
R A. If the failure message ECU (B CHANNEL) is not confirmed:
R - no maintenance action is required.
R NOTE : This failure message is generated when there is an internal ECU

____
R cross channel fault, control alternator stator contact, or related
R wiring.
R
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