Fault Message:

L BVSB 5.2 CH A WRG/BVSB RNG

Fault Code:

7325616LBR

Associated CAS:

L FADEC FAIL
(Caution)

The fault message is set when:

• The resistance in Solenoid 5.2 (channel A) of the Bleed Valve Solenoid Control Block (BVSB) is not within limits
• There is an open or short circuit in the interface wiring

The BVSB circuits are checked during power-up and continuously monitored by the Full-Authority Digital Engine-Controller (FADEC).

• Left Engine Electronic Controller (EEC)
• Bleed Valve Solenoid Control Block (BVSB)
• Compressor Fairing
• Associated Wiring

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

1. Open the following circuit breakers:

System	Circuit Breaker Name	Bus Name
ENGINE	L FADEC CH A	BATT
ENGINE	L FADEC CH B	BATT
ENGINE	L ENG IGN 1	BATT
ENGINE	L ENG IGN 2	BATT
ENGINE	L ENG FUEL HPSOV	BATT
ENGINE	L ENG START A	BATT
ENGINE	L ENG START B	BATT
ENGINE	L T/R CTL VALVE	BATT
ENGINE	L T/R LOWER LOCK	BATT
ENGINE	L T/R UPPER LOCK	BATT

2. Perform a deactivation of the thrust reverser.
3. Open the cowls.
4. Remove the applicable bypass-duct access panel and the applicable compressor fairing.

   1. If the fault message is stored, fault could be intermittent.
   2. If the fault message is not stored, continue with next step.

5. Disconnect the connector J1030 from the core lane A and disconnect P1030 on bypass duct.
6. Perform a check of resistance of the BVSB as follows:
   On A/C Post SB 75-101096

   From	To	Expected Result	Result
   P1030-7	P1030-18	70 to 90 ohms at 68 °F (20 °C) ±1.70 ohms per 9 °F (5 °C)
   P1030-7	Ground	>40 megohm

   On A/C Post SB 75-101161

   From	To	Expected Result	Result
   P1030-7	P1030-18	95 to 115 ohms at 68 °F (20 °C) ±1.70 ohms per 9 °F (5 °C)
   P1030-7	Ground	>40 megohm

   1. If the resistance values are not as specified above, repair defective wiring as required and go to step 17.
   2. If the resistance values are as specified above, continue with next step.

7. Connect the connector J1030 to the core lane A and connect P1030.

   1. If the resistance values of the BVSB are not as specified, replace the BVSB and go to step 17.
   2. If the resistance values of the BVSB are as specified, continue with next step.

8. Close the following circuit breakers:

System Name	Circuit Breaker Name	Bus Name
ENGINE	L FADEC CH A	BATT
ENGINE	L FADEC CH B	BATT

9. Connect the electrical power to the aircraft.

   1. If fault does not exist, go to step 14.
   2. If fault still exists, remove the electrical power from the aircraft and continue with next step.

10. Open the following circuit breakers:

    System Name	Circuit Breaker Name	Bus Name
    ENGINE	L FADEC CH A	BATT
    ENGINE	L FADEC CH B	BATT

    1. If fault not exist, replace defective circuit breaker as required and go to step 17.
    2. If the fault message stays active or the resistance values are as specified, continue with next step.

11. Perform wiring checks between the EEC connector P1044, bypass duct connector J1030 and the BVSB connector P1007.

    1. If wiring checks are not good, repair defective wiring as required and go to step 17.
    2. If wiring checks are good, continue with next step.

12. Close the following circuit breakers:

    System Name	Circuit Breaker Name	Bus Name
    ENGINE	L FADEC CH A	BATT
    ENGINE	L FADEC CH B	BATT

13. Connect the electrical power to the aircraft.
14. Make sure that L (R) FADEC FAIL (caution) does not show on the EICAS display.

    1. If the L (R) FADEC FAIL (caution) message shows on the EICAS display, troubleshoot them first and continue with next step.
    2. If the L (R) FADEC FAIL (caution) message not show on the EICAS display, continue with next step.

15. Remove the electrical power from the aircraft.
16. Replace Left EEC.
17. Close the cowls and activate Thrust Reverser.
18. Do close out.