Loss of the Signal of the FADEC Oil Temperature Sensor to the ECU on Engine 2 Channel B

TASK 79-32-00-810-829-A
Loss of the Signal of the FADEC Oil Temperature Sensor to the ECU on Engine 2 Channel B

1. Possible Causes

oil temperature sensor
harness J13
ECU [4000KS]
harness HJ13

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 73-21-50-000-012	Removal of the J13 Harness
AMM 73-21-50-000-046	Removal of the HJ13 Harness for SAC Engines
AMM 73-21-50-210-001	Visual Inspection of the Wiring Harness
AMM 73-21-50-210-002	Visual Inspection of the Wiring Harnesses
AMM 73-21-50-400-012	Installation of the J13 Harness
AMM 73-21-50-400-046	Installation of the HJ13 Harness for SAC Engines
AMM 73-21-60-000-001	Removal of the Electronic Control Unit (ECU)
AMM 73-21-60-400-001	Installation of the Electronic Control Unit (ECU)
ASM 732518
AMM 73-29-00-710-040	Operational Test of the FADEC on the ground (with Engine Motoring)
AMM 79-31-40-000-001	Removal Oil Temperature Sensor (IDG Cooling System Control Sensor)
AMM 79-31-40-400-001	Installation Oil Temperature Sensor (IDG Cooling System Control Sensor)
AMM 79-32-15-000-042	Removal of the Oil Temperature Sensor (IDG Cooling System Control Sensor)
AMM 79-32-15-400-042	Installation of the Oil Temperature Sensor (IDG Cooling System Control Sensor)

3. Fault Confirmation
Subtask 79-32-00-710-103-A ** ON A/C NOT FOR ALL

A. Do the operational test of the FADEC 2B on the ground (with engine non motoring) AMM 73-29-00-710-040.

4. Fault Isolation
Subtask 79-32-00-810-083-A ** ON A/C NOT FOR ALL

A. This fault message is generated if the output signal is lost from the ECU dedicated oil temperature sensor used for the fuel return valve control.

NOTE: This sensor is not used for the oil temperature indication in the cockpit.

(1) If the test gives the maintenance message EOT SENS, J13, ECU:

Disconnect the connector of the harness J13 from the oil temperature sensor and do a resistance check of the sensor ASM 732518 between:
. Pins 1 and 2 (0.5 to 10 ohms)
. Pins 3 and 4 (0.5 to 10 ohms)
. Pins 2 and 5 (>1 megohm)
. Pins 3 and 5 (>1 megohm)
. Pin 1 and the ground (>1 megohm)
. Pin 4 and the ground (>1 megohm).

(a) If the resistance values are out of the specified limits:

Replace the oil temperature sensor AMM 79-31-40-000-001 and AMM 79-31-40-400-001.

(b) If the resistance values are in the specified limits:

Connect the harness J13 to the oil temperature sensor again.
Disconnect the connector of the harness J13 from the ECU (4000KS) and do a resistance check ASM 732518 between:
. PPns 10 and 22 (0.5 to 10 ohms)
. Pins 9 and 20 (0.5 to 10 ohms)
. Pins 9 and 21 (>1 megohm)
. Pins 10 and 21 (>1 megohm)
. Pin 9 and the ground (>1 megohm)
. Pin 10 and the ground (>1 megohm).

1 If the resistance values are out of the specified limits:

Replace the harness J13 AMM 73-21-50-000-012 and AMM 73-21-50-400-012.

2 If the resistance values are in the specified limits:

Replace the ECU (4000KS) AMM 73-21-60-000-001 and AMM 73-21-60-400-001.

(2) If the test does not give the maintenance message EOT SENS, J13, ECU:

Do a check of the connectors on the harness J13 between the ECU and the oil temperature sensor for loosening, contamination, corrosion or damaged pins or sockets.

(a) If there is loosening, contamination, corrosion or dammage:

Clean, retighten or replace the harness J13 as required AMM 73-21-50-210-001.

(b) If there is no loosening, contamination, corrosion or dammage:

Replace the oil temperature sensor AMM 79-31-40-000-001 and AMM 79-31-40-400-001.

1 If the fault continues:

Replace the harness J13 AMM 73-21-50-000-012 and AMM 73-21-50-400-012.

a If the fault continues:

Replace the ECU [4000KS] AMM 73-21-60-000-001 and AMM 73-21-60-400-001.

Subtask 79-32-00-810-083-B ** ON A/C NOT FOR ALL

A. This fault message is generated if the output signal is lost from the ECU dedicated oil temperature sensor used for the fuel return valve control.

NOTE: This sensor is not used for the oil temperature indication in the cockpit.

(1) If the test gives the maintenance message EOT SNSR, J13, ECU:

Disconnect the connector of the harness HJ13 from the oil temperature sensor and do a resistance check of the sensor ASM 732518 between:
. Pins 1 and 2 (0.5 to 10 ohms)
. Pins 3 and 4 (0.5 to 10 ohms)
. Pins 2 and 5 (>1 megohm)
. Pins 3 and 5 (>1 megohm)
. Pin 1 and the ground (>1 megohm)
. Pin 4 and the ground (>1 megohm).

(a) If the resistance values are out of the specified limits:

Replace the oil temperature sensor AMM 79-32-15-000-042 and AMM 79-32-15-400-042.

(b) If the resistance values are in the specified limits:

Connect the harness HJ13 to the oil temperature sensor again.
Disconnect the connector of the harness HJ13 from the ECU (4000KS) and do a resistance check ASM 732518 between:
. Pins 10 and 22 (0.5 to 10 ohms)
. Pins 9 and 20 (0.5 to 10 ohms)
. Pins 9 and 21 (>1 megohm)
. Pins 10 and 21 (>1 megohm)
. Pin 9 and the ground (>1 megohm)
. Pin 10 and the ground (>1 megohm).

1 If the resistance values are out of the specified limits:

Replace the harness HJ13 AMM 73-21-50-000-046 and AMM 73-21-50-400-046.

2 If the resistance values are in the specified limits:

Replace the ECU (4000KS) AMM 73-21-60-000-001 and AMM 73-21-60-400-001.

(2) If the test does not give the maintenance message EOT SENS, J13, ECU:

Do a check of the connectors on the harness HJ13 between the ECU and the oil temperature sensor for loosening, contamination, corrosion or damaged pins or sockets.

(a) If there is loosening, contamination, corrosion or dammage:

Clean, retighten or replace the harness HJ13 as required AMM 73-21-50-210-002.

(b) If there is no loosening, contamination, corrosion or dammage:

Replace the oil temperature sensor AMM 79-32-15-000-042 and AMM 79-32-15-400-042.

1 If the fault continues:

Replace the harness HJ13 AMM 73-21-50-000-046 and AMM 73-21-50-400-046.

a If the fault continues:

Replace the ECU [4000KS] AMM 73-21-60-000-001 and AMM 73-21-60-400-001.

Subtask 79-32-00-810-083-C ** ON A/C NOT FOR ALL

A. This fault message is generated if the output signal is lost from the ECU dedicated oil temperature sensor used for the fuel return valve control.

NOTE: This sensor is not used for the oil temperature indication in the cockpit.

(1) If the test gives the maintenance message EOT SNSR, J13, ECU:

Disconnect the connector of the harness J13 from the oil temperature sensor and do a resistance check of the sensor ASM 732518 between:
. PPns 1 and 2 (0.5 to 10 ohms)
. pins 3 and 4 (0.5 to 10 ohms)
. Pins 2 and 5 (>1 megohm)
. Pins 3 and 5 (>1 megohm)
. Pin 1 and the ground (>1 megohm)
. Pin 4 and the ground (>1 megohm).

(a) If the resistance values are out of the specified limits:

Replace the oil temperature sensor AMM 79-31-40-000-001 and AMM 79-31-40-400-001.

(b) If the resistance values are in the specified limits:

Connect the harness J13 to the oil temperature sensor again.
Disconnect the connector of the harness J13 from the ECU (4000KS) and do a resistance check ASM 732518 between:
. Pins 10 and 22 (0.5 to 10 ohms)
. Pins 9 and 20 (0.5 to 10 ohms)
. Pins 9 and 21 (>1 megohm)
. Pins 10 and 21 (>1 megohm)
. Pin 9 and the ground (>1 megohm)
. Pin 10 and the ground (>1 megohm).

1 If the resistance values are out of the specified limits:

Replace the harness J13 AMM 73-21-50-000-012 and AMM 73-21-50-400-012.

2 If the resistance values are in the specified limits:

Replace the ECU (4000KS) AMM 73-21-60-000-001 and AMM 73-21-60-400-001.

(2) If the test does not give the maintenance message EOT SNSR, J13, ECU:

Do a check of the connectors on the harness J13 between the ECU and the oil temperature sensor for loosening, contamination, corrosion or damaged pins or sockets.

(a) If there is loosening, contamination, corrosion or dammage:

Clean, retighten or replace the harness J13 as required AMM 73-21-50-210-001.

(b) If there is no loosening, contamination, corrosion or dammage:

Replace the oil temperature sensor AMM 79-31-40-000-001 and AMM 79-31-40-400-001.

1 If the fault continues:

Replace the harness J13 AMM 73-21-50-000-012 and AMM 73-21-50-400-012.

a If the fault continues:

Replace the ECU [4000KS] AMM 73-21-60-000-001 and AMM 73-21-60-400-001.

Subtask 79-32-00-710-104-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.
(1) No additional maintenance action is required if the fault is not confirmed.
(2) Repeat the fault isolation procedure if the fault continues.

[Rev.8 from Aug 2018] 2026.04.04 04:38:24 UTC