(b) If the resistance values are out of the specified limits:
- disconnect the cables J11 and J12 from the cables CJ11L and CJ12L at the 6 o'clock junction box and do a resistance check of the cables CJ11L and CJ12L between: for cable CJ11L . pins 5 and 6 (80 to 110 Ohms) . pins 2 and 7 (80 to 120 Ohms) . pins 3 and 4 (80 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). for cable CJ12L . pins 17 and 6 (80 to 110 Ohms) . pins 18 and 19 (80 to 120 Ohms) . pins 8 and 20 (80 to 120 Ohms) . pins 17 and 7 (> 10 Megohms) . pins 18 and 7 (> 10 Megohms)
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F 『 E C F M E E E E 56 E E E . pins 8 and 7 (> 10 Megohms)
. pin 17 and the ground (> 10 Megohms)
. pin 18 and the ground (> 10 Megohms)
. pin 8 and the ground (> 10 Megohms).
1 If the resistance values are in the specified limits:
_
- replace the defective harness J11 (Ref. AMM TASK 73-21-50-000-044) and (Ref. AMM TASK 73-21-50-400-044) or harness J12 (Ref. AMM TASK 73-21-50-000-045) and (Ref. AMM TASK 73-21-50-400-045).
2 If the resistance values are out of the specified limits:
_
- disconnect the cables CJ11L and CJ12L from the VBV sensor and do a resistance check of the VBV sensor between: . pins 2 and 3 (80 to 110 Ohms) . pins 4 and 5 (80 to 120 Ohms) . pins 6 and 7 (80 to 120 Ohms) . pin 2 and the ground (> 10 Megohms) . pin 4 and the ground (> 10 Megohms) . pin 6 and the ground (> 10 Megohms).
a If the resistance values are in the specified limits:
_
- replace the defective harness CJ11L (Ref. AMM TASK 73-21-50-000-025) and (Ref. AMM TASK 73-21-50-400-025) or harness CJ12L (Ref. AMM TASK 73-21-50-000-027) and (Ref. AMM TASK 73-21-50-400-027).
b If the resistance values are out of the specified limits:
_
- replace the VBV sensor (RVDT) (Ref. AMM TASK 75-31-70-000-002) and (Ref. AMM TASK 75-31-70-400-002).
B. Do the test given in Para. 3.A.
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Loss of the feedback Signal from the VBV through the two Channels on Engine 2
1. Possible Causes
_______________
- 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
ASM 73-25/18
ASM 73-25/18
3. Fault Confirmation
__________________
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 2A and 2B on the ground (with engine motoring) (Ref. AMM TASK 73-29-00-710-040).
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