W DOC AIRBUS | TSM A320F

Fuel-Control Unit (P19) Fault (131-9(A))

TASK 49-00-81-810-859-A
Fuel-Control Unit (P19) Fault (131-9(A))

1. Possible Causes
  • FUEL TEMP SENSOR SHOWS OUT OF RANGE LOW
  • FUEL TEMP SENSOR SHOWS OUT OF RANGE HIGH
  • FUEL RESOLVER POSITION SHOWS INCORRECT POSITION
  • damage/contamination of electrical connector P19
  • FUEL CONTROL UNIT (P19)
  • aircraft wiring
  • ELECTRONIC CONTROL BOX [59KD]
  • FUEL CONTROL UNIT (8022KM)
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
AR
MULTIMETER - STANDARD
 B. Referenced Information
REFERENCE
DESIGNATION
AMM 49-32-11-000-003
Removal of the Fuel Control Unit (FCU) (131-9(A))
AMM 49-32-11-400-003
Installation of the Fuel Control Unit (FCU) (131-9(A))
ASM 496104
AMM 49-61-34-000-003
Removal of the Electronic Control Box (ECB) (131-9(A))
AMM 49-61-34-400-003
Installation of the Electronic Control Box (ECB) (131-9(A))
3. Fault Confirmation
Subtask 49-00-81-710-068-A ** ON A/C NOT FOR ALL
A. Read-out of ECB Trouble-Shooting Data
   (1) Put the APU MASTER SW to the ON position.
   (2) Get access to the APU LAST LEG/PREVIOUS LEG report.
   (3) Push the '>' adjacent to the related CFDS failure message:
  • the MCDU menu shows:
    FUEL TEMP SENSOR SHOWS OUT OF RANGE LOW
    or
    FUEL TEMP SENSOR SHOWS OUT OF RANGE HIGH
    or
    FUEL RESOLVER POSITION SHOWS INCORRECT POSITION
   (4) Get access to the APU GND SCANNING menu.
4. Fault Isolation
Subtask 49-00-81-810-062-A ** ON A/C NOT FOR ALL
A. If the APU GND SCANNING menu gives the maintenance message:

FUEL CONTROL UNIT P19

associated with Fault Code Number (FCN) 51 or 52

  • do a check for damage/contamination of electrical connector P19 of the FUEL CONTROL UNIT (P19)
   (1) If the electrical connector P19 is damaged/contaminated:
  • do a repair/cleaning.
   (2) If the electrical connector is OK:
  • use a MULTIMETER - STANDARD to do a resistance check across pin 4 and pin 5 of the FUEL CONTROL UNIT (P19).
     (a) If the resistance value is not between 107 Ohms to 113 Ohms:
     (b) If the resistance value is between 107 Ohms to 113 Ohms:
  • do a check and repair of the aircraft wiring from the ECB (59KD) AB/C3,C4 to the FUEL CONTROL UNIT (P19) P19/4,5 ASM 496104.
       1 If the fault continues:
Subtask 49-00-81-810-189-A ** ON A/C NOT FOR ALL
B. If the APU GND SCANNING menu gives the maintenance message:

FUEL CONTROL UNIT (P19)

associated with Fault Code Number (FCN) 78

  • do a check for damage/contamination of electrical connector P19 of the FUEL CONTROL UNIT (P19).
   (1) If the electrical connector P19 is damaged/contaminated:
  • do a repair/cleaning.
   (2) If the electrical connector is OK:
  • use a MULTIMETER - STANDARD to do a resistance check across
    pin 2 and pin 3 (PRIMARY FCU RESOLVER); required value between 50 Ohms and 95 Ohms
    and
    pin 2/pin 3 and pin 1 (PRIMARY FCU RESOLVER); required value > 40 MOhms
    and
    pin 10/pin 11 and pin 12 (SECONDARY FCU RESOLVER); required value between 65 Ohms and 105 Ohms
    and
    pin 10/pin 11 and pin 1 (SECONDARY FCU RESOLVER); required value > 40 MOhms
    of the FUEL CONTROL UNIT (P19).
     (a) If the resistance values are out of the specified limits:
     (b) If the resistance values are in the specified limits:
  • do a check and repair of the aircraft wiring from the ECB (59KD) AB/A10,A11 to the FUEL CONTROL UNIT (P19) P19/2,3 (PRIMARY FCU RESOLVER) and the ECB (59KD) AB/H10,B5, B6 to FUEL CONTROL UNIT (P19) P19/12,10,11 (SECONDARY FCU RESOLVER) ASM 496104.
       1 If the fault continues:
Subtask 49-00-81-810-062-B ** ON A/C NOT FOR ALL
C. If the APU GND SCANNING menu gives the maintenance message:

FUEL CONTROL UNIT (8022KM)

associated with Fault Code Number (FCN) 51 or 52

  • do a check for damage/contamination of electrical connector P19 of the FUEL CONTROL UNIT (8022KM).
   (1) If the electrical connector P19 is damaged/contaminated:
  • do a repair/cleaning.
   (2) If the electrical connector is OK:
  • use a MULTIMETER - STANDARD to do a resistance check across pin 4 and pin 5 of the FUEL CONTROL UNIT (8022KM).
     (a) If the resistance value is not between 107 Ohms to 113 Ohms:
     (b) If the resistance value is between 107 Ohms to 113 Ohms:
  • do a check and repair of the aircraft wiring from the ECB (59KD) AB/C3,C4 to the FUEL CONTROL UNIT (8022KM) P19/4,5 ASM 496104.
       1 If the fault continues:
Subtask 49-00-81-810-189-B ** ON A/C NOT FOR ALL
D. If the APU GND SCANNING menu gives the maintenance message:

FUEL CONTROL UNIT (8022KM)

associated with Fault Code Number (FCN) 78

  • do a check for damage/contamination of electrical connector P19 of the FUEL CONTROL UNIT (8022KM).
   (1) If the electrical connector P19 is damaged/contaminated:
  • do a repair/cleaning.
   (2) If the electrical connector is OK:
  • use a MULTIMETER - STANDARD to do a resistance check across
    pin 2 and pin 3 (PRIMARY FCU RESOLVER); required value between 50 Ohms and 95 Ohms
    and
    pin 2/pin 3 and pin 1 (PRIMARY FCU RESOLVER); required value > 40 MOhms
    and
    pin 10/pin 11 and pin 12 (SECONDARY FCU RESOLVER); required value between 65 Ohms and 105 Ohms
    and
    pin 10/pin 11 and pin 1 (SECONDARY FCU RESOLVER); required value > 40 MOhms
    of the FUEL CONTROL UNIT (8022KM).
     (a) If the resistance values are out of the specified limits:
     (b) If the resistance values are in the specified limits:
  • do a check and repair of the aircraft wiring from the ECB (59KD) AB/A10,A11 to the FUEL CONTROL UNIT (8022KM) P19/2,3 (PRIMARY FCU RESOLVER) and the ECB (59KD) AB/H10,B5, B6 to FUEL CONTROL UNIT (8022KM) P19/12,10,11 (SECONDARY FCU RESOLVER) ASM 496104.
       1 If the fault continues:
Subtask 49-00-81-710-069-A ** ON A/C NOT FOR ALL
E. Do a check of the APU GND SCANNING menu to verify the fault is not present.
[Rev.8 from Aug 2018] 2026.04.04 04:34:36 UTC
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