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 Loss of the feedback signal from the TBV valve through the two channels on Engine 1
 1. Possible Causes
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 - ECU (4000KS)

 - harness HJ11

 - harness HJ12

 - harness CJ11L

 - harness CJ12L

 - TBV valve

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM  73-21-50-000-025 
AMM  73-21-50-000-027 
AMM  73-21-50-000-044 
AMM  73-21-50-000-045 
AMM  73-21-50-210-002 
AMM  73-21-50-400-025 
AMM  73-21-50-400-027 
AMM  73-21-50-400-044 
AMM  73-21-50-400-045 
R  AMM  73-21-60-000-001 
AMM  73-21-60-400-001 
R 
AMM  73-29-00-710-040 
R  AMM  75-26-10-000-001 
R  AMM  75-26-10-400-001 
3. Fault Confirmation__________________

Removal of the CJ11L HarnessRemoval of the CJ12L HarnessRemoval of the HJ11 HarnessRemoval of the HJ12 HarnessVisual Inspection of the Wiring HarnessesInstallation of the CJ11L HarnessInstallation of the CJ12L HarnessInstallation of the HJ11 HarnessInstallation of the HJ12 Harness Removal of the Electronic Control Unit (ECU)(4000KS)Installation of the Electronic Control Unit (ECU)(4000KS)Operational Test of the FADEC on the ground (with Engine Motoring) Removal of the Transient Bleed Valve Installation of the Transient Bleed Valve
 A. Do the operational test of the FADEC 1A and 1B on the ground (with engine motoring) (Ref. AMM TASK 73-29-00-710-040).
 4. Fault Isolation
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 A. If the test gives the maintenance message TBV VLV, J11, ECU and TBV VLV, J12, ECU:
 - Disconnect the HJ11 and HJ12 harnesses fron the J11 and J12 receptacles on the ECU (4000KS). Make sure that the electrical contacts of the J11 and J12 receptacles are not bent or have not moved (Ref. AMM TASK 73-21-50-210-002).
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 (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 a resistance check of the TBV valve circuits through the HJ11 and HJ12 harnesses, between: . pins 40 and 41 (67 to 75 Ohms) . pins 20 and 39 (23 to 27 Ohms) . pins 8 and 22 (23 to 27 Ohms) . pins 40 and 21 (> 10 Megohms) . pins 20 and 21 (> 10 Megohms) . pins 8 and 21 (> 10 Megohms) . pin 40 and the ground (> 10 Megohms) . pin 20 and the ground (> 10 Megohms) . pin 8 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 cables HJ11 and HJ12 from the cables CJ11L and CJ12L at the 6 o' clock junction box and do a resistance check through the CJ11L and CJ12L harnesses between: for cable CJ11L . pins 8 and 10 (67 to 75 ohms) . pins 11 and 12 (23 to 27 ohms) . pins 13 and 14 (23 to 27 ohms) . pins 8 and 9 (> 10 Megohms) . pins 11 and 9 (> 10 Megohms) . pins 13 and 9 (> 10 Megohms) . pin 8 and the ground (> to Megohms) . pin 11 and the ground (> 10 Megohms) . pin 13 and the ground (> 10 Megohms) for cable CJ12L . pins 2 and 3 (67 to 75 ohms) . pins 4 and 5 (23 to 27 ohms) . pins 12 and 13 (23 to 27 ohms) . pins 2 and 1 (> 10 Megohms) . pins 4 and 1 (> 10 Megohms) . pins 12 and 1 (> 10 Megohms) . pin 2 and ground (> to Megohms) . pin 4 and ground (> 10 Megohms) . pin 12 and ground (> 10 Megohms).
 1 If the resistance values are in the specified limits:
_
 - replace the defective harness HJ11 (Ref. AMM TASK 73-21-50-000-044) and (Ref. AMM TASK 73-21-50-400-044) or harness HJ12 (Ref. AMM TASK 73-21-50-000-045) and (Ref. AMM TASK 73-21-50-400-045).
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