B. Do the test given in Para. 3.A.
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TASK 75-26-00-810-804
Loss of the feedback signal from the TBV valve through the channel B on Engine
1. Possible Causes
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- ECU (4000KS)
- harness HJ12
- harness CJ12L
- Transient Bleed Valve (TBV)
2. Job Set-up Information
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A. Referenced Information
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REFERENCE DESIGNATION
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AMM 73-21-50-000-027 Removal of the CJ12L Harness
AMM 73-21-50-000-045 Removal of the HJ12 Harness
AMM 73-21-50-400-027 Installation of the CJ12L Harness
AMM 73-21-50-400-045 Installation of the HJ12 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 non Motoring)
R AMM 75-26-10-000-001 Removal of the Transient Bleed Valve
R AMM 75-26-10-400-001 Installation of the Transient Bleed Valve
3. Fault Confirmation
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A. Do the operational test of the FADEC 2B on the ground (with engine non 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, J12, ECU:
- disconnect the HJ12 harness from the J12 receptacle on the ECU (4000KS). Make sure that the electrical contacts of the J12 receptacle are not bent or have not moved.
(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).
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(2) Do a resistance check of the TBV valve circuits (channel B), through HJ12 and CJ12L 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 (more than 10 Megohms) . pins 20 and 21 (more than 10 Megohms) . pins 8 and 21 (more than 10 Megohms) . pin 40 and the ground (more than 10 Megohms) . pin 20 and the ground (more than 10 Megohms) . pin 8 and the ground (more than 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 cable HJ12 from the cable CJ12L at the 6 o'clock junction box and do a resistance check of the TBV valve circuits (channel B), through the CJ12L harness between: . 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 (more than 10 Megohms) . pins 4 and 1 (more than 10 Megohms) . pins 12 and 1 (more than 10 Megohms) . pin 2 and ground (more than 10 Megohms) . pin 4 and ground (more than 10 Megohms) . pin 12 and ground (more than 10 Megohms)
1 If the resistance values are in the specified limits:
_
- replace the harness HJ12 (Ref. AMM TASK 73-21-50-000-045) and (Ref. AMM TASK 73-21-50-400-045).
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