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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 * 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
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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
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REFERENCE DESIGNATION
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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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