B. Do the test given in Para. 3.A.
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TASK 75-26-00-810-803
Loss of the feedback signal from the TBV valve through the channel A on Engine
1. Possible Causes
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- ECU (4000KS)
- harness HJ11
- harness CJ11L
- 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 73-21-50-000-025 Removal of the CJ11L Harness
AMM 73-21-50-000-044 Removal of the HJ11 Harness
AMM 73-21-50-400-025 Installation of the CJ11L Harness
AMM 73-21-50-400-044 Installation of the HJ11 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 2A 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, J11, ECU:
- disconnect the HJ11 harness from the J11 receptacle on the ECU (4000KS). Make sure that the electrical contacts of the J11 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 A), through HJ11 and CJ11L 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 HJ11 from the cable CJ11L at the 6 o'clock junction box and do a resistance check of the TBV valve circuits (channel A), through the CJ11L harness between: . 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 (more than 10 Megohms) . pins 11 and 9 (more than 10 Megohms) . pins 13 and 9 (more than 10 Megohms) . pin 8 and the ground (more than 10 Megohms) . pin 11 and the ground (more than 10 Megohms) . pin 13 and the ground (more than 10 Megohms)
1 If the resistance values are in the specified limits:
_
- replace the harness HJ11 (Ref. AMM TASK 73-21-50-000-044) and (Ref. AMM TASK 73-21-50-400-044).
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