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R B. If the test does not give the maintenance message VSV ACT, J12, ECU:
R - No maintenance action is required.
R C. Do the test given in Para. 3.A.
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TASK 75-32-00-810-808
Loss of the feedback Signal from the VSV through the Channel B on Engine 2
1. Possible Causes
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- harness J12
- ECU (4000KS)
- harness CJ12L
- VSV actuator
2. Job Set-up Information
______________________
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) 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. 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 VSV ACT, J12, ECU:
- do a check for open or short to ground of the harness 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 the wiring is not correct:
- repair the above wiring.
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(2) If the wiring is correct:
- disconnect the cable J12 from the ECU (4000KS) and do a resistance check of the cable 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 cable J12 from the cable CJ12L at the 6 o'clock junction box and do a resistance check of the cable CJ12L between: . 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 25 and the ground (> 10 Megohms) . pin 21 and the ground (> 10 Megohms).
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