Disagree between the Oil Pressure Transmitter 2 and the Low Oil Pressure Switch 2

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1. Possible Causes
· XMTR-OIL PRESS ( 4003EN )
· SW-LOW OIL PRESS ( 4000EN )
· EIU-2 ( 1KS2 )
· wiring from the pin AA/7A of the EIU 2 (1KS2) to the pin A/2 of the low oil pressure switch (4000EN)
· wiring from the pins AA/8D, 8B of the EIU 2 (1KS2) to the pins A/4,3 of the oil pressure transmitter
(4003EN)
2 Job Set-up Information
A. Referenced Information
REFERENCE DESIGNATION
Ref. AWM 71-51-02
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 73-25-34-710-042 Operational Test of the EIU with the CFDS
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 79-33-00-710-052-A
A. Test
(1) Do the operational test of the EIU 2 with the CFDS Ref. AMM 73-25-34-710-042 .
4. Fault Isolation
Subtask 79-33-00-810-051-A
A. If the operational test gives the maintenance message OIL PRESS XMTR2 4003EN OR LOW PRESS2
SW 4000EN:
· replace the XMTR-OIL PRESS ( 4003EN ) , Ref. AMM 79-33-15-000-010 and Ref.
AMM 79-33-15-400-010 .
(1) 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 .
(2) If the fault continues:
· replace the EIU-2 ( 1KS2 ) , Ref. AMM 73-25-34-000-041 and Ref. AMM 73-25-34-400-041 .
(3) If the fault continues:
· do a check and repair the:
wiring from the pin AA/7A of the EIU 2 (1KS2) to the pin A/2 of the low oil pressure
switch (4000EN)
wiring from the pins AA/8D, 8B of the EIU 2 (1KS2) to the pins A/4,3 of the oil
pressure transmitter (4003EN) , Ref. ASM 79-36-01.
(4) If the fault continues:
· do a check and repair the wiring:
. from the low oil pressure switch (4000EN) pin A/1 to the ground point connection
GP1-3
. from the oil pressure transmitter (4003EN) pin A/2 to the ground point connection
GP1-5 Ref. AWM 71-51-02.
Subtask 79-33-00-710-053-A
B. Do the test given in Para. 3. [Rev.6 from Feb 2017] 2026.04.04 04:38:29 UTC