Loss of the Oil Temperature Signal from Sensor 4004EN or Disagree with Oil Temperature Signal from ECU Oil Temperature Sensor on Engine 2

TASK 79-32-00-810-822-A
Loss of the Oil Temperature Signal from Sensor 4004EN or Disagree with Oil Temperature Signal from ECU Oil Temperature Sensor on Engine 2

1. Possible Causes

SENSOR-OIL TEMP [4004EN]
aircraft wiring
EIU-2 [1KS2]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 71-51-43-000-001	Removal of the Left Side Harness
AMM 71-51-43-400-001	Installation of the Left Side Harness
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 79-32-15-000-041	Removal of the Oil Temperature Sensor (Engine Condition Monitoring Sensor)
AMM 79-32-15-400-041	Installation of the Oil Temperature Sensor (Engine Condition Monitoring Sensor)
ASM 793601

3. Fault Confirmation
Subtask 79-32-00-710-092-A ** ON A/C NOT FOR ALL

A. Not applicable.

4. Fault Isolation
Subtask 79-32-00-810-075-A ** ON A/C NOT FOR ALL

A. Procedure.

NOTE: The fault is triggered if the oil temperature sensor (4004EN) indicates a temperature greater than 140 deg. C while the ECU temperature sensor indicates a temperature in between - 55 deg. C and 135 deg. C. This is indicative of a faulty output of oil temperature sensor (4004EN).

(1) Check carrefully electrical connector at the oil temperature sensor (4004EN) for looseness, damaged pins or contamination.
(a) If damage is found:

repair or replace as necessary.

(b) If nothing is found:

replace the SENSOR-OIL TEMP [4004EN] AMM 79-32-15-000-041 and AMM 79-32-15-400-041.

(2) If the fault continues:

do a check of the aircraft wiring between the oil temperature sensor (4004EN) and the EIU (1KS2) for open or short to ground ASM 793601 pin AA/1 to pin AA/10F. Pay particular attention to engine to pylon connectors 4005VC-A, 405VC-A, 4006VC-A and 406VC-A and to ground wire connections (9951DC, 9956DC and 9957DC) on Engine Fan Case (check for looseness or contamination).

(a) if damage is found:

repair or replace the harness as necessary AMM 71-51-43-000-001 and AMM 71-51-43-400-001.

(b) if nothing is found:

replace the EIU-2 [1KS2] AMM 73-25-34-000-040 and AMM 73-25-34-400-040.

Subtask 79-32-00-710-093-A ** ON A/C NOT FOR ALL

B. Do the operational test of the Engine Interface Unit (EIU) through the CFDS AMM 73-25-34-710-040.
(1) Check that failure message ECU2 4000KS OR OIL TEMP SENSOR 2 4004EN is no longer present.

[Rev.8 from Aug 2018] 2026.04.04 04:38:23 UTC