- If the fault continues, 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 harness HJ7 from the HMU and visually examine the receptacle and connector for damage pin or contamination (Ref. AMM TASK 73-21-50-210-002)
- do a check of the HMU resistance between: . pins 29 and 30 (17 to 23 Ohms).
* If the resistance values are in the specified limits:
- replace the defective harness HJ7 (Ref. AMM TASK 73-21-50-000-040) and (Ref. AMM TASK 73-21-50-400-040) or
* If the resistance values are out of the specified limits:
- replace the Hydromechanical Unit (HMU) (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).
C. Do the test given in Para. 3.A.
(1) If the fault is not confirmed:
- no additional maintenance action is required.
(2) If the fault continues:
- repeat the fault isolation procedure.
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Loss of the feedback Signal from the VBV through the two Channels on Engine 1
1. Possible Causes
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- VBV sensor (RVDT)
- ECU (4000KS)
- harness J11
- harness J12
- harness CJ11L
- harness CJ12L
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 73-21-50-000-025
AMM 73-21-50-000-027
AMM 73-21-50-000-044
AMM 73-21-50-000-045
AMM 73-21-50-400-025
AMM 73-21-50-400-027
AMM 73-21-50-400-044
AMM 73-21-50-400-045
AMM 73-21-60-000-001
AMM 73-21-60-400-001
AMM 73-29-00-710-040
AMM 75-31-70-000-001
AMM 75-31-70-000-002
AMM 75-31-70-400-001
AMM 75-31-70-400-002
ASM 73-25/18
3. Fault Confirmation
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Removal of the CJ11L HarnessRemoval of the CJ12L HarnessRemoval of the HJ11 HarnessRemoval of the HJ12 HarnessInstallation of the CJ11L HarnessInstallation of the CJ12L HarnessInstallation of the HJ11 HarnessInstallation of the HJ12 HarnessRemoval of the Electronic Control Unit (ECU)(4000KS)Installation of the Electronic Control Unit (ECU)(4000KS)Operational Test of the FADEC on the ground (with Engine Motoring)Removal of the Variable Bleed Valve Position SensorRemoval of the Variable Bleed Valve position SensorInstallation of the Variable Bleed Valve Position SensorInstallation of the Variable Bleed Valve position Sensor
A. Do the operational test of the FADEC 1A and 1B 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 VBV SNSR, J11, ECU + VBV SNSR, 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 juntion box and the VBV sensor (RVDT) (Ref. ASM 73-25/18).
(1) If one of these wirings is not correct:
- repair the defective above wirings.
(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 13 and 29 (80 to 110 Ohms) . pins 30 and 31 (80 to 120 Ohms) . pins 15 and 32 (80 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).
(a) If the resistance values are in the specified limits:
- replace the VBV sensor (RVDT) (Ref. AMM TASK 75-31-70-000-001) and (Ref. AMM TASK 75-31-70-400-001).
- if the problem is still reported after the VBV sensor replacement, 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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