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 2 If the resistance values are out of the specified limits:
_
 - disconnect the CJ12L harness from the TBV valve and do a resistance check of the TBV valve circuits (channel B) between: . pins 2 and 3 (67 to 75 Ohms) . pins 4 and 5 (23 to 27 Ohms) . pins 6 and 7 (23 to 27 Ohms) . pin 2 and ground (more than 10 Megohms) . pin 4 and ground (more than 10 Megohms) . pin 6 and ground (more than 10 Megohms).
 a If the resistance values are in the specified limits:
_
 - replace the harness CJ12L (Ref. AMM TASK 73-21-50-000-027) and (Ref. AMM TASK 73-21-50-400-027).
 b If the resistance values are out of the specified limits:
_ R - replace the Transient Bleed Valve (TBV) (Ref. AMM TASK R 75-26-10-000-001) and (Ref. AMM TASK 75-26-10-400-001).
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 B. Do the test given in Para. 3.A.
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 TASK 75-26-00-810-805
 Loss of the TBV torque motor control through the channel A on Engine 1
 1. Possible Causes
_______________
 - ECU (4000KS)

 - harness HJ7

 - 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 73-21-50-210-002 Visual Inspection of the Wiring Harnesses
 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)
 3. Fault Confirmation
__________________
 A. Test
 (1) 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 J7, HMU(TBV TM), ECU: disconnect the harness HJ7 from the J7 receptacle on the ECU (4000KS). Make sure that the electrical contacts of the J7 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 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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 TASK 75-26-00-810-806
 Loss of the TBV torsque motor control through the channel B on Engine 1
 1. Possible Causes
_______________
　
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