Failure of the Oil Low Pressure and Ground Relays on Engine 1

TASK 73-25-00-810-847-A
Failure of the Oil Low Pressure and Ground Relays on Engine 1

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 732509
AMM 73-25-34-000-040	Removal of the Engine Interface Unit (EIU)
AMM 73-25-34-400-040	Installation of the Engine Interface Unit (EIU)
AMM 73-25-34-710-040	Operational Test of the Engine Interface Unit
AMM 73-25-34-710-043	Operational Test of the Engine Interface Unit

3. Fault Confirmation
Subtask 73-25-00-710-142-A ** ON A/C NOT FOR ALL

A. Do the operational test of the Engine Interface Unit (EIU) through the Centralized Fault Display System (CFDS) AMM 73-25-34-710-040.

Subtask 73-25-00-710-142-B ** ON A/C NOT FOR ALL

A. Do the operational test of the Engine Interface Unit (EIU) through the Centralized Fault Display System (CFDS) AMM 73-25-34-710-043.

4. Fault Isolation
Subtask 73-25-00-810-096-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message CHECK 10KS1 RELAY CIRCUIT OR EIU1:

replace the RELAY-OIL LOW PRESS AND GROUND, ENG 1 [10KS1] or/and the RELAY-OIL LOW PRESS AND GROUND, ENG 1 [11KS1] ASM 732509.

(1) If the fault continues:

(2) If the fault continues:

do a check and repair the wiring from the EIU 1 (1KS1) to the relays (10KS1) or/and (11KS1) pin AB/9D to pins AA/X, Z of the two relays ASM 732509.

Subtask 73-25-00-710-143-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.A.

[Rev.8 from Aug 2018] 2026.04.04 04:35:42 UTC