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 - replace the ECU (4000KS), (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
 2 If the resistance values are out of the specified limits:
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 - Reconnect the J8 harness to the ECU (4000KS) receptacle, and continue the troubleshooting.
 (c) Disconnect the J8 harness from the HMU receptacle (located left hand core compartment), and visually examine the J8 harness connector and the HMU receptacle for damaged pins, contamination and fuel wetting (Ref. AMM TASK 73-21-50-210-002).
 1 If damage on a connector is found:
_ - Replace or repair as required.
 2 If fuel wetting is found:
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 - replace the harness J8, (Ref. AMM TASK 73-21-50-000-041) and (Ref. AMM TASK 73-21-50-400-041).
 3 If nothing is found:
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 - Do an electrical resistance test on the HMU receptacle between: . pins 27 and 28 (17 to 23 Ohms) . pins 27 and 12 (> 10 Megohms) . pin 27 and the ground (> 10 Megohms).
 a If the resistance values are in the specified limits:
_
 - replace the harness J8, (Ref. AMM TASK 73-21-50-000-041) and (Ref. AMM TASK 73-21-50-400-041).
 b If the resistance values are out of the specified limits:
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 - replace the Hydromechanical Unit (HMU), (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).
 (5) If the test gives the maintenance messages J7, HMU (FMV TM), ECU + J8, HMU (FMV TM), ECU (on both channel A and B):
 - replace the ECU (4000KS), (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
 (a) If the fault repeat:
 - Do the troubleshooting described on steps 4.A.(3) and 4.A.(4).
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 F 『 E C F M E E E E 56 E E E B. Do the test given in Para. 3.A.(1).

 (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 73-29-00-810-858
 Loss of the RAC SB Torque Motor Control through the Two Channels on Engine 1
 1. Possible Causes
_______________
 - ECU (4000KS)

 - harness J7

 - harness J8

 - Hydromechanical Unit (HMU)

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 73-21-10-000-002 Removal of the Hydromechanical Unit (HMU) AMM 73-21-10-400-002 Installation of the Hydromechanical Unit (HMU) AMM 73-21-50-000-040 Removal of the HJ7 Harness AMM 73-21-50-000-041 Removal of the HJ8 Harness AMM 73-21-50-400-040 Installation of the HJ7 Harness AMM 73-21-50-400-041 Installation of the HJ8 Harness AMM 73-21-60-000-001 Removal of the Electronic Control Unit (ECU)(4000KS) AMM 73-21-60-400-001 Installation of the Electronic Control Unit
 (ECU)(4000KS) AMM 73-29-00-710-040 Operational Test of the FADEC on the ground (with Engine Motoring) ASM 73-25/18
 3. Fault Confirmation
__________________
 A. Test
 (1) Do the operational test of the FADEC 1A and 1B on the ground (with engine motoring) (Ref. AMM TASK 73-29-00-710-040).
 NOTE : If post SB 75-029, fault message must be ignored: no trouble
____
 shooting is necessary.

 4. Fault Isolation
_______________
 A. If the test gives the maintenance messages J7, HMU(RAC TM), ECU + J8, HMU(RAC TM), ECU:
 - do a check for open or short to ground at pins J7/20, 39, 40 and J8/20, 39, 40 of the harnesses J7 and J8 between the ECU (4000KS) and the RACC torque motor in the HMU, (Ref. ASM 73-25/18).
 (1) If one of these wirings is not correct:
 - repair the defective harness J7 or J8.
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 E 56 E E E (2) If these wirings are correct:

 - disconnect the harnesses J7 and J8 from the ECU and do a check of the ECU cable resistance between: . pins 20 and 40 (17 to 23 Ohms) . pins 20 and 39 (> 10 Megohms) . pin 20 and the ground (> 10 Megohms).
 (a) If the resistance values are in the specified limits:
　
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