Loss of the T5 Sensor Signal to the ECU on Engine 1

TASK 77-20-00-810-811-A
Loss of the T5 Sensor Signal to the ECU on Engine 1

1. Possible Causes

ECU [4000KS]
harness J13
harness CJ13
T5 temperature sensor
harness HJ13

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AWM 715109
AMM 73-21-50-000-005	Removal of the CJ13 Harness
AMM 73-21-50-000-012	Removal of the J13 Harness
AMM 73-21-50-000-029	Removal of the CJ13 Harness
AMM 73-21-50-000-046	Removal of the HJ13 Harness for SAC Engines
AMM 73-21-50-400-005	Installation of the CJ13 Harness
AMM 73-21-50-400-012	Installation of the J13 Harness
AMM 73-21-50-400-029	Installation of the CJ13 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 77-22-10-000-001	Removal of the T5 Sensor
AMM 77-22-10-000-002	Removal of the T5 Sensor
AMM 77-22-10-400-001	Installation of the T5 Sensor
AMM 77-22-10-400-002	Installation of the T5 Sensor

3. Fault Confirmation
Subtask 77-20-00-710-070-A ** ON A/C NOT FOR ALL

A. Test
(1) Do the operational test of the FADEC 1A on the ground (with engine non motoring) AMM 73-29-00-710-040.

Subtask 77-20-00-710-070-B ** ON A/C NOT FOR ALL

A. Test
(1) Do the operational test of the FADEC 1A on the ground (with engine non motoring) AMM 73-29-00-710-040.

4. Fault Isolation
Subtask 77-20-00-810-094-A ** ON A/C NOT FOR ALL

A. The T5 signal is part of the PMUX configuration only used for Engine Condition Monitoring.

NOTE: If the engine is not equipped in a PMUX configuration, you can do as follows:

Replace the engine Identification Connector by a connector configured as Non-PMUX so fault messages do not occur.
Ignore this fault message.

NOTE: The fault message will occur if the T5 sensor signal is invalid or out of range.

Subtask 77-20-00-810-094-B ** ON A/C NOT FOR ALL

A. The T5 signal is part of the PMUX configuration only used for Engine Condition Monitoring.

NOTE: If the engine is not equipped in a PMUX configuration, you can do as follows:

Replace the engine Identification Connector by a connector configured as Non-PMUX so fault messages do not occur.
Ignore this fault message.

NOTE: The fault message will occur if the T5 sensor signal is invalid or out of range.

Subtask 77-20-00-810-060-A ** ON A/C NOT FOR ALL

B. If the test gives the maintenance message T5 SENS, J13, ECU:

do a check for open or short to ground of the harness J13 between the ECU (4000KS) and the 6 o'clock junction box, between the 6 o'clock junction box and the T5 sensor ASM 732518.

(1) If the wiring is not correct:

repair the above wiring.

(2) If the wiring is correct:

disconnect the harness J13 from the ECU (4000KS) and do a resistance check of the cable J13 between:
. pins 11 and 23 (0.5 to 10 ohms)
. pins 11 and 24 ( > to megohms)
. pin 11 and the ground ( > 10 megohms).

(a) 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.

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

disconnect the connector CJ13 at the 6 o'clock junction box and do a resistance check of the cable CJ13 between:
. pins 2 and 11 (0.5 to 10 ohms)
. pins 2 and 12 ( > 10 megohms)
. pin 2 and the ground ( > 10 megohms) AWM 715109.

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

disconnect the harness CJ13 from the T5 sensor and do a resistance check of the T5 sensor between:
. pins A and B (0.88 to 1.22 ohms)
. pin A and the ground ( > 10 megohms).

a If the resistance values are in the specified limits:

replace the harness CJ13 AMM 73-21-50-000-005 and AMM 73-21-50-400-005.

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

replace the T5 temperature sensor AMM 77-22-10-000-001 and AMM 77-22-10-400-001.

Subtask 77-20-00-810-060-B ** ON A/C NOT FOR ALL

B. If the test gives the maintenance message T5 SNSR, J13, ECU or T5 SNSR, J13, ECU*:

do a check for open or short to ground of the harness J13 between the ECU (4000KS) and the 6 o'clock junction box, between the 6 o'clock junction box and the T5 sensor ASM 732518.

(1) If the wiring is not correct:

repair the above wiring.

(2) If the wiring is correct:

disconnect the harness J13 from the ECU (4000KS) and do a resistance check of the cable J13 between:
. pins 11 and 23 (0.5 to 10 ohms)
. pins 11 and 24 ( > to megohms)
. pin 11 and the ground ( > 10 megohms).

(a) 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.

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

disconnect the connector CJ13 at the 6 o'clock junction box and do a resistance check of the cable CJ13 between:
. pins 2 and 11 (0.5 to 10 ohms)
. pins 2 and 12 ( > 10 megohms)
. pin 2 and the ground ( > 10 megohms) AWM 715109.

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

disconnect the harness CJ13 from the T5 sensor and do a resistance check of the T5 sensor between:
. pins A and B (0.88 to 1.22 ohms)
. pin A and the ground ( > 10 megohms).

a If the resistance values are in the specified limits:

replace the harness CJ13 AMM 73-21-50-000-005 and AMM 73-21-50-400-005.

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

replace the T5 temperature sensor AMM 77-22-10-000-001 and AMM 77-22-10-400-001.

Subtask 77-20-00-810-060-C ** ON A/C NOT FOR ALL

B. If the test gives the maintenance message T5 SNSR, J13, ECU*:

do a check for open or short to ground of the harness HJ13 between the ECU (4000KS) and the 6 o'clock junction box, between the 6 o'clock junction box and the T5 sensor ASM 732518.

(1) If the wiring is not correct:

repair the above wiring.

(2) If the wiring is correct:

disconnect the harness HJ13 from the ECU (4000KS) and do a resistance check of the cable J13 between:
. pins 11 and 23 (0.5 to 10 ohms)
. pins 11 and 24 ( > to megohms)
. pin 11 and the ground ( > 10 megohms).

(a) 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.

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

disconnect the connector CJ13 at the 6 o'clock junction box and do a resistance check of the cable CJ13 between:
. pins 2 and 11 (0.5 to 10 ohms)
. pins 2 and 12 ( > 10 megohms)
. pin 2 and the ground ( > 10 megohms) AWM 715109.

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

disconnect the harness CJ13 from the T5 sensor and do a resistance check of the T5 sensor between:
. pins A and B (0.88 to 1.22 ohms)
. pin A and the ground ( > 10 megohms).

a If the resistance values are in the specified limits:

replace the harness CJ13 AMM 73-21-50-000-029 and AMM 73-21-50-400-029.

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

replace the T5 temperature sensor AMM 77-22-10-000-002 and AMM 77-22-10-400-002.

Subtask 77-20-00-710-071-A ** ON A/C NOT FOR ALL

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

[Rev.8 from Aug 2018] 2026.04.04 04:37:44 UTC