and visually examine the HJ12 harness connector and the VBV R sensor (RVDT) receptacle for damaged pins and contamination R (Ref. AMM TASK 73-21-50-210-001).
R (e) If damage is found:
- repair or replace as required.
R (f) If no damage is found:
- do an electrical resistance test through the HJ12 harness between: . pins 13 and 29 (80 to 110 ohms) . pins 30 and 31 (80 to 120 ohms) . pins 15 and 32 (85 to 120 ohms) . pins 13 and 14 (> 10 megohms) . pins 30 and 14 (> 10 megohms) . pins 15 and 14 (> 10 megohms) . pin 13 and the ground (> 10 megohms) . pin 30 and the ground (> 10 megohms) . pin 15 and the ground (> 10 megohms).
(g) If the resistance test 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).
(h) If the resistance test values are out of the specified limits:
- disconnect the HJ12 harness (located at the 6 o'clock junction box) from the CJ12L and do an electrical resistance test through the CJ12L harness between: . pins 5 and 6 (80 to 110 ohms) . pins 2 and 7 (80 to 120 ohms) . pins 3 and 4 (85 to 120 ohms) . pins 5 and 1 (> 10 megohms) . pins 2 and 1 (> 10 megohms) . pins 3 and 1 (> 10 megohms) . pin 5 and the ground (> 10 megohms) . pin 2 and the ground (> 10 megohms) . pin 3 and the ground (> 10 megohms).
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- replace the CJ12L harness (Ref. AMM TASK 73-21-50-000-027) and (Ref. AMM TASK 73-21-50-400-027).
(j) If the resistance test values are in the specified limits:
- replace the HJ12 harness (Ref. AMM TASK 73-21-50-000-045) and (Ref. AMM TASK 73-21-50-400-045).
B. Do the test given in Para. 3.A.
(1) No additional maintenance action is required if the fault is not confirmed.
(2) Repeat the fault isolation procedure if the fault continues.
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TASK 75-30-00-810-816
Loss of the VBV Feedback Signal - Engine 2 - Channel B
1. Possible Causes
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- VBV sensor (RVDT)
- ECU (4000KS)
- harness HJ12
- harness CJ12L
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 73-21-50-000-027 Removal of the CJ12L Harness AMM 73-21-50-000-045 Removal of the HJ12 Harness AMM 73-21-50-210-001 Visual Inspection of the Wiring Harness AMM 73-21-50-400-027 Installation of the CJ12L Harness AMM 73-21-50-400-045 Installation of the HJ12 Harness AMM 73-21-60-000-001 Removal of the Electronic Control Unit (ECU) AMM 73-21-60-400-001 Installation of the Electronic Control Unit (ECU) AMM 73-29-00-710-040 Operational Test of the FADEC on the Ground (with
Engine non Motoring) R AMM 75-31-00-200-002 Manual Operation Check of the Variable Bleed Valve R Doors
AMM 75-31-70-000-002 Removal of the Variable Bleed Valve position Sensor AMM 75-31-70-400-002 Installation of the Variable Bleed Valve position Sensor
3. Fault Confirmation
__________________
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. The failure message is generated if the channel B signal is invalid, out of range, or both channels disagree.
(1) If the failure message VBV SNSR, J12, ECU is not confirmed:
(a) No maintenance action is required.
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(2) If the failure message VBV SENS, J12, ECU is not confirmed but is repetitive:
- disconnect the CJ12L harness from the VBV sensor (VBV-B connector) located in the left core compartment and visually examine the receptacle and the harness for damaged pins and contamination (Ref. AMM TASK 73-21-50-210-001). 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320 Trouble Shooting Manual 排故手册 大气 AIR(62)
