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

 (2) Do resistance check of the TBV valve circuits (channel A) through the HJ7 harness, between: . pins 20 and 40 (17 to 23 Ohms) . pins 20 and 39 (> 10 Megohms) . pin 20 and the ground (> 10 Megohms).

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E F 『 E C F M E E E E 56 E E E (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 harness HJ7 from the HMU and do a check of the HMU receptacle resistance between: . pins 20 and 40 (17 to 23 Ohms) . pins 20 and 39 (> 10 Megohms) . pin 20 and the ground (> 10 Megohms).
 1 If the resistance values are in the specified limits:
_
 - replace the harness HJ7, (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 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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ECES E

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 E E
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 E E

 TASK 75-26-00-810-808
 Loss of the TBV torque motor control through the channel B on Engine 2
 1. Possible Causes
_______________
 - ECU (4000KS)

 - harness HJ8

 - 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 73-21-50-000-041 Removal of the HJ8 Harness
 AMM 73-21-50-210-002 Visual Inspection of the Wiring Harnesses
 AMM 73-21-50-400-041 Installation of the HJ8 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)
 3. Fault Confirmation
__________________
 A. Test
 (1) Do the operational test of the FADEC 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 message J8, HMU(TBV TM), ECU: disconnect the harness HJ8 from the J8 receptacle on the ECU (4000KS). Make sure that the electrical contacts of the J8 receptacle are not bent or have not moved (Ref. AMM TASK 73-21-50-210-002).
 (1) If you find damage:

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

 (2) Do resistance check of the TBV valve circuits (channel B) through the HJ8 harness, between: . pins 20 and 40 (17 to 23 Ohms) . pins 20 and 39 (> 10 Megohms) . pin 20 and the ground (> 10 Megohms).

 F 『 EEFF : ALL E ∞∞75-26-00∞∞∞∞∞∞∞∞∞∞Page 219
 E E May 01/00 E E ECES
E F 『 E C F M E E E E 56 E E E (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 harness HJ8 from the HMU and do a check of the HMU receptacle resistance between: . pins 20 and 40 (17 to 23 Ohms) . pins 20 and 39 (> 10 Megohms) . pin 20 and the ground (> 10 Megohms).
 1 If the resistance values are in the specified limits:
_
 - replace the harness HJ8, (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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