Oil Low Pressure Warning with Oil Pressure Indication more than 60 psi on Engine 1

1. Possible Causes
· SW-LOW OIL PRESS ( 4000EN )
· wiring from the EIU1 (1KS1) to the low oil pressure switch (4000EN)
· EIU-1 ( 1KS1 )
· XMTR-OIL PRESS ( 4003EN )
· wiring from the EIU1 (1KS1) to the oil pressure transmitter (4003EN)
2 Job Set-up Information
A. Referenced Information
REFERENCE DESIGNATION
Ref. AMM 24-41-00-861-002 Energize the Aircraft Electrical Circuits from the External Power
Ref. AMM 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied from the External
Power
Ref. AMM 31-60-00-860-002 EIS Stop Procedure
Ref. AMM 70-23-15-912-010 Connection of Electrical Connectors
Ref. AMM 71-00-00-710-018 Discontinued Start, Restart and Shutdown Procedures
Ref. AMM 71-00-00-710-043 Normal Engine Automatic Start Procedure
Ref. AMM 71-00-00-710-047 Normal Engine Manual Start Procedure
Ref. AMM 71-13-00-410-010 Closing of the Fan Cowls 437AL(447AL),438AR(448AR)
Ref. AMM 71-50-00-210-010 Wire Harness Visual Inspection - All Power Plant Electrical Cables
Ref. AMM 73-25-34-000-041 Removal of the Engine Interface Unit (EIU)
Ref. AMM 73-25-34-400-041 Installation of the Engine Interface Unit (EIU)
Ref. AMM 79-33-15-000-010 Removal of the Oil Pressure Transmitter
Ref. AMM 79-33-15-400-010 Installation of the Oil Pressure Transmitter
Ref. AMM 79-34-15-000-010 Removal of the Low Oil Pressure Switch
Ref. AMM 79-34-15-400-010 Installation of the Low Oil Pressure Switch
Ref. ASM 79-36-01
3. Fault Confirmation
Subtask 79-33-00-860-052-A
A. Job Set-up
(1) Energize the aircraft electrical circuits
Ref. AMM 24-41-00-861-002 .
(2) On the panel 50VU, release the ENG/FADEC GND PWR/1 pushbutton switch.
Subtask 79-33-00-710-090-A
B. Test
(1) On the panel 50VU, push the ENG/FADEC GND PWR/1 pushbutton switch and release it again.
NOTE: This action resets the FADEC memory.
(2) Start the engine 1 by the normal engine automatic start procedure Ref. AMM 71-00-00-710-043 or
the normal engine manual start procedure Ref. AMM 71-00-00-710-047 .
(3) Do a check to see if the OIL LO PRESS warning is shown on the upper display unit.
(4) On the lower display unit, do a check on the ENGINE page to see if the oil pressure of the engine 1 is
more than 60 psi.
(5) Do a shutdown of the engine 1 by the discontinued start, restart and shutdown procedure Ref.
AMM 71-00-00-710-018 .
4. Fault Isolation
Subtask 79-33-00-810-074-A
A. If the test confirms the fault:
· examine the harness Ref. AMM 71-50-00-210-010 from the EIU1 (1KS1) to the low oil pressure switch
(4000EN) Ref. ASM 79-36-01.
(1) If the fault continues:
· disconnect the connector from the low oil pressure switch (4000EN)
· examine the connector and receptacle Ref. AMM 71-50-00-210-010
· connect the connectors to the low oil pressure switch (4000EN) Ref. AMM 70-23-15-912-010 .
(2) If the fault continues:
· replace the SW-LOW OIL PRESS ( 4000EN ) Ref. AMM 79-34-15-000-010 and Ref.
AMM 79-34-15-400-010 .
(3) If the fault continues:
· do a check and repair the wiring from the EIU1 (1KS1) to the low oil pressure switch (4000EN)
from pin AA/7A to pin A/2 Ref. ASM 79-36-01.
(4) If the fault continues:
· replace the EIU-1 ( 1KS1 ) Ref. AMM 73-25-34-000-041 and Ref. AMM 73-25-34-400-041 .
(5) If the fault continues:
· replace the XMTR-OIL PRESS ( 4003EN ) Ref. AMM 79-33-15-000-010 and Ref.
AMM 79-33-15-400-010 .
(6) If the fault continues:
· do a check and repair the wiring from the EIU1 (1KS1) to the oil pressure transmitter (4003EN)
from pins AA/8D, 8B to pins A/4, 3.
Subtask 79-33-00-710-091-A
B. Do the test given in Para. 3.
5. Close-up
Subtask 79-33-00-860-053-A
A. Put the aircraft back to its initial configuration.
(1) On the ECAM control panel, set the UPPER DISPLAY and LOWER DISPLAY potentiometers to OFF.
Ref. AMM 31-60-00-860-002 .
(2) On the panel 50VU, push the ENG/FADEC GND PWR/1 pushbutton switch.
(3) De-energize the aircraft electrical circuits
Ref. AMM 24-41-00-862-002 .
(4) Make sure that the fan cowls 437AL and 438AR are closed Ref. AMM 71-13-00-410-010 . [Rev.6 from Feb 2017] 2026.04.04 04:38:30 UTC