- harness J7

 - 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 73-21-50-400-040 Installation of the HJ7 Harness

R 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 R (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. Do the operational test of the FADEC 1A on the ground (with engine motoring) (Ref. AMM TASK 73-29-00-710-040).
 4. Fault Isolation
_______________
 A. If the test gives the maintenance message HMU (FMV):
 - do a check for line to line short circuit of the harness J7 between the ECU (4000KS) and the hydromechanical unit (HMU) pins J7/27, 28 (Ref. ASM 73-25/18).
 (1) If the wiring is not correct:

 - repair the above defective wiring.

 (2) If the wiring is correct:

 - disconnect the cable J7 from the ECU (4000KS) and do a check of the ECU cable resistance between: . pins 27 and 28 (17 to 23 Ohms).
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 E E May 01/98 E E ECES
E E 56 E E E (a) If the resistance values are in the specified limits:

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 E  C F M  E
 E  E

 - 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 cable J7 from the HMU and do a resistance check of the HMU between: . pins 27 and 28 (17 to 23 Ohms).
 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).
 2 If the resistance values are out of the specified limits:
_
 - replace the 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.
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 E E Feb 01/98 E E ECES
E

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 E C F M E
 E E
 E 56 E
 E E

 TASK 73-10-00-810-802
 Failure of the HMU Fuel Metering Valve on Engine 2
 1. Possible Causes
_______________
 - ECU (4000KS)

 - harness J7

 - 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 73-21-50-400-040 Installation of the HJ7 Harness

R 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 R (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. Do the operational test of the FADEC 2A on the ground (with engine motoring) (Ref. AMM TASK 73-29-00-710-040).
 4. Fault Isolation
_______________
 A. If the test gives the maintenance message HMU (FMV):
 - do a check for line to line short circuit of the harness J7 between the ECU (4000KS) and the hydromechanical unit (HMU) pins J7/27, 28 (Ref. ASM 73-25/18).
 (1) If the wiring is not correct:

 - repair the above defective wiring.

 (2) If the wiring is correct:

 - disconnect the cable J7 from the ECU (4000KS) and do a check of the ECU cable resistance between: . pins 27 and 28 (17 to 23 Ohms).
 (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).
 F 『 EEFF : ALL E ∞∞73-10-00∞∞∞∞∞∞∞∞∞∞Page 203
　
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