R C. Do the test given in Para. 3.A.
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TASK 75-32-00-810-804
Loss of the feedback Signal from the VSV through the two Channels on Engine 2
1. Possible Causes
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- ECU (4000KS)
- harness J11
- harness J12
- harness CJ11R
- harness CJ12L
- VSV actuator
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 73-21-50-000-026 Removal of the CJ11R Harness
AMM 73-21-50-000-027 Removal of the CJ12L Harness
AMM 73-21-50-000-044 Removal of the HJ11 Harness
AMM 73-21-50-000-045 Removal of the HJ12 Harness
AMM 73-21-50-400-026 Installation of the CJ11R Harness
AMM 73-21-50-400-027 Installation of the CJ12L Harness
AMM 73-21-50-400-044 Installation of the HJ11 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 Motoring) AMM 75-32-10-000-002 Removal of the Variable Stator Vane (VSV) Actuators AMM 75-32-10-400-002 Installation of the Variable Stator Vane (VSV)
Actuators
ASM 73-25/18
3. Fault Confirmation
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A. Test
(1) Do the operational test of the FADEC 2A and 2B on the ground (with engine motoring) (Ref. AMM TASK 73-29-00-710-040).
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4. Fault Isolation
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A. If the test gives the maintenance messages VSV ACT, J11, ECU and VSV ACT, J12, ECU:
- do a check for open or short to ground of the harnesses J11 and J12 between the ECU (4000KS) and the 6 o'clock junction box, between the 6 o'clock junction box and the VSV LVDT (Ref. ASM 73-25/18).
(1) If one of these wirings is not correct:
- repair the defective wiring.
(2) If these wirings are correct:
- disconnect the cables J11 (Channel A) and J12 (Channel B) from the ECU (4000KS) and do a resistance check of the cables J11 and J12 between: . pins 12 and 28 (400 to 600 Ohms) . pins 26 and 27 (100 to 180 Ohms) . pins 10 and 25 (100 to 180 Ohms) . pins 12 and 11 (> 10 Megohms) . pins 26 and 11 (> 10 Megohms) . pins 10 and 11 (> 10 Megohms) . pin 12 and the ground (> 10 Megohms) . pin 26 and the ground (> 10 Megohms) . pin 10 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 J11 and J12 from the cables CJ11R and CJ12L at the 6 o'clock junction box and do a resistance check of the cables CJ11R and CJ12L between: For cable CJ11R . pins 4 and 14 (400 to 600 Ohms) . pins 1 and 6 (100 to 180 Ohms) . pins 15 and 27 (100 to 180 Ohms) . pins 4 and 5 (> 10 Megohms) . pins 1 and 5 (> 10 Megohms) . pins 15 and 5 (> 10 Megohms) . pin 4 and the ground (> 10 Megohms) . pin 1 and the ground (> 10 Megohms) . pin 15 and the ground (> 10 Megohms). for cable CJ12L . pins 24 and 11 (400 to 600 Ohms) . pins 23 and 22 (100 to 180 Ohms) . pins 21 and 9 (100 to 180 Ohms) . pins 24 and 10 (> 10 Megohms) . pins 23 and 10 (> 10 Megohms) . pins 21 and 10 (> 10 Megohms) . pin 24 and the ground (> 10 Megohms) . pin 23 and the ground (> 10 Megohms)
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∞∞75-32-00∞∞∞∞∞∞∞∞∞∞Page 209 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(74)
