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 1B on the ground (with engine non motoring) (Ref. AMM TASK 73-29-00-710-040).
 4. Fault Isolation
_______________
 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).
 (a) If damage is found:

 - repair or replace as required.

 (b) If no damage is found:

 - replace the VBV sensor (RVDT) (Ref. AMM TASK 75-31-70-000-002) and (Ref. AMM TASK 75-31-70-400-002).
 NOTE : After new VBV sensor is installed, a rigging of the VBV
____ R system is required (Ref. AMM TASK 75-31-00-200-002).
 (c) If the fault continues during the subsequent flights:
 - disconnect the HJ12 harness from the ECU (4000KS) and visually examine the receptacle and the connector for damaged pins and contamination (Ref. AMM TASK 73-21-50-210-001).
 1 If damage is found:
_ - repair or replace as required.
 2 If no damage is found:
_
 - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
 (d) If the fault continues during the subsequent flights:

 - replace the harness HJ12 (ECU to the 6 o'clock junction box) (Ref. AMM TASK 73-21-50-000-045) and (Ref. AMM TASK 73-21-50-400-045).

 (e) If the fault continues during the subsequent flights:

 - replace the harness CJ12L (located in the left core compartment) (Ref. AMM TASK 73-21-50-000-027) and (Ref. AMM TASK 73-21-50-400-027).
 (3) If the failure message VBV SENS, J12, ECU is confirmed:
 - disconnect the CJ12L harness from the VBV sensor (VBV-B connector) located in the left core compartment and visually examine the CJ12L harness connector and the VBV sensor (RVDT) receptacle for damaged pins and contamination (Ref. AMM TASK 73-21-50-210-001).
 (a) If damage is found:

 - repair or replace as required.

 (b) If no damage is found:

 - do an electrical resistance test through the VBV sensor between: . pins 2 and 3 (80 to 110 ohms)
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 . pins 4 and 5 (80 to 120 ohms)
 . pins 6 and 7 (85 to 120 ohms)
 . pin 2 and the ground (> 10 megohms)
 . pin 4 and the ground (> 10 megohms)
 . pin 6 and the ground (> 10 megohms).

 (c) If the resistance test values are out of the specified limits:

 - replace the VBV sensor (Ref. AMM TASK 75-31-70-000-002) and (Ref. AMM TASK 75-31-70-400-002).

 (d) If the resistance test values are in the specified limits:

 - reconnect the harness CJ12L (VBV-B connector) to the VBV sensor (RVDT),

 - disconnect the harness HJ12 from the ECU (4000KS) receptacle
　
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