Loss of the ENG 1 OIL LOW PRESS Signal from the Relay to the TPIS

TASK 32-49-00-810-820-A
Loss of the ENG 1 OIL LOW PRESS Signal from the Relay to the TPIS

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 32-49-00-710-001	Operational Test of the Tire Pressure Indicating System (TPIS)
ASM 324901
AMM 32-49-34-000-001	Removal of the TPIS Detection Unit
AMM 32-49-34-400-001	Installation of the TPIS Detection Unit
ASM 761201

3. Fault Confirmation
Subtask 32-49-00-865-053-A

A. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	ENGINE/ENG1/OIL/PRESS	2EN1	N40
** ON A/C NOT FOR ALL
121VU	OIL/PRESS/ENG1	10KC1	N40

Subtask 32-49-00-710-089-A ** ON A/C NOT FOR ALL

B. Test
(1) Do the operational test of the TPIS AMM 32-49-00-710-001.

4. Fault Isolation
Subtask 32-49-00-810-069-C ** ON A/C NOT FOR ALL

A. If the operational test gives the maintenance message CHECK OIL PRESS SWITCH 3EN1:

NOTE: The FIN of the relay given in this fault message is not correct. In the NEO configuration, relay 11KC1 replaces relay 3EN1.

(1) If the fault continues:

(2) If the fault continues:

Do a check of the wiring ASM 324901 between:
. the TPIS (2GV) pin AB/11A and the relay (11KC1) pin A/6
. the relay (11KC1) pin A/C and the ground.

(a) If there is no continuity:

(b) If there is continuity:

1 If the fault continues:

Do a check and repair the wiring ASM 761201 between:
. the circuit breaker (10KC1) and the relay (11KC1) pin A/X
. the relay (11KC1) pin A/Z and the control switch (3KC) pin 3A
. the control switch (3KC) pin 1A and the ground.

Subtask 32-49-00-710-090-A ** ON A/C NOT FOR ALL

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

[Rev.8 from Aug 2018] 2026.04.04 04:31:47 UTC