W DOC AIRBUS | TSM A320F

Low-Oil Pressure-Switch (P14) Fault (131-9(A))

TASK 49-00-81-810-868-A
Low-Oil Pressure-Switch (P14) Fault (131-9(A))

1. Possible Causes
  • LOW OIL PRESSURE SWITCH SHOWS OPEN CIRCUIT
  • damage/contamination of electrical connector P14
  • LOW OIL PRESSURE SWITCH (P14)
  • aircraft wiring
  • ELECTRONIC CONTROL BOX [59KD]
  • LOW OIL PRESSURE SWITCH (8091KM)
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
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))
AMM 49-94-14-000-003
Removal of the Low Oil Pressure Switch (131-9(A))
AMM 49-94-14-400-003
Installation of the Low Oil Pressure Switch (131-9(A))
3. Fault Confirmation
Subtask 49-00-81-710-086-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 '>'-key adjacent to the related CFDS failure message.
   (4) If the MCDU menu shows:
LOW OIL PRESSURE SWITCH SHOWS OPEN CIRCUIT
  • do the Fault Confirmation that follows:
     (a) Get access to the APU TEST menu.
     (b) Push the TEST line key.
4. Fault Isolation
Subtask 49-00-81-810-071-A ** ON A/C NOT FOR ALL
A. If the APU TEST menu gives the maintenance message:

LOW OIL PRESS SW P14

associated with Fault Code Number (FCN) 98

  • do a check for damage/contamination of electrical connector P14 of the LOW OIL PRESSURE SWITCH (P14)
   (1) If the electriacl connector P14 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 1 and pin 2 of the LOW OIL PRESSURE SWITCH (P14)
     (a) If the resistance value is > 10 Ohms:
     (b) If the resistance value is < 10 Ohms:
  • do a check and repair of the aircraft wiring from
    the ECB (59KD) AB/C5 to LOW OIL PRESSURE SWITCH (P14) P14/1
    and
    the LOW OIL PRESSURE SWITCH (P14) P14/2 to GND
    ASM 496104.
       1 If the fault continues:
Subtask 49-00-81-810-071-B ** ON A/C NOT FOR ALL
A. If the APU TEST menu gives the maintenance message:

LOW OIL PRESS SW (8091KM)

associated with Fault Code Number (FCN) 98

  • do a check for damage/contamination of electrical connector P14 of the LOW OIL PRESSURE SWITCH (8091KM)
   (1) If the electriacl connector P14 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 1 and pin 2 of the LOW OIL PRESSURE SWITCH (8091KM)
     (a) If the resistance value is > 10 Ohms:
     (b) If the resistance value is < 10 Ohms:
  • do a check and repair of the aircraft wiring from
    the ECB (59KD) AB/C5 to LOW OIL PRESSURE SWITCH (8091KM) P14/1
    and
    the LOW OIL PRESSURE SWITCH (8091KM) P14/2 to GND
    ASM 496104.
       1 If the fault continues:
Subtask 49-00-81-710-087-A ** ON A/C NOT FOR ALL
B. Do a check of the APU TEST menu to verify the fault is not present.
[Rev.8 from Aug 2018] 2026.04.04 04:34:37 UTC
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