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 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 2A and 2B on the ground (with engine motoring) (Ref. AMM TASK 73-29-00-710-040).
 4. Fault Isolation_______________
 A. If the test gives the maintenance messages J7, HMU(VSV TM), ECU + J8, HMU(VSV TM), ECU:
 - do a check for open or short to ground at pins J7/10, 25, 26 and J8/10, 25, 26 of the harnesses J7 and J8 between the ECU (4000KS) and the VSV 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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 - disconnect the harnesses J7 and J8 from the ECU and do a check of the ECU cable resistance between: . pins 25 and 26 (17 to 23 Ohms) . pins 25 and 10 (> 10 Megohms) . pin 25 and the ground (> 10 Megohms).
 (a) If the resistance values are in the specified limits:

 - replace the ECU(4000KS), (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).

 (b) If the resistance values are out of the specified limits:

 - disconnect the harnesses J7 and J8 from the HMU and do a check of the HMU receptacle resistance between: . pins 25 and 26 (17 to 23 Ohms) . pins 25 and 10 (> 10 Megohms) . pin 25 and the ground (> 10 Megohms).
 1 If the resistance values are in the specified limits:
_
 - replace the defective harness J7, (Ref. AMM TASK 73-21-50-000-040) and (Ref. AMM TASK 73-21-50-400-040) or the defective harness J8, (Ref. AMM TASK 73-21-50-000-041) and (Ref. AMM TASK 73-21-50-400-041).
 2 If the resistance values are out of the specified limits:
_
 - replace the Hydromechanical Unit (HMU), (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).
 B. Do the test given in Para. 3.A.(1).
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 TASK 73-29-00-810-862
 Loss of the VBV Torque Motor Control - Engine 1 - Channel A and Channel B
 1. Possible Causes
_______________
 - ECU (4000KS)

 - Hydromechanical Unit (HMU)

 - HJ7 harness

 - HJ8 harness

 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 73-21-50-210-001 Visual Inspection of the Wiring 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) 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)
 3. Fault Confirmation
__________________
 A. Test
 (1) Do the operational test of the FADEC 1A and 1B on the ground (with engine non motoring) (Ref. AMM TASK 73-29-00-710-040).
 4. Fault Isolation
_______________
 A. This fault is generated if there is an open or short to ground in the VBV torque motor current loop on channel A.
 (1) If the failure messages J7, HMU(VBV TM), ECU + J8, HMU(VBV TM), ECU are not confirmed:

 - no maintenance action is required.

 (2) If the failure messages J7, HMU(VBV TM), ECU + J8, HMU(VBV TM), ECU are not confirmed, but are repetitive:

 - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
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