Failure of the PS12 Signal on Engine 2

TASK 73-20-00-810-866-A
Failure of the PS12 Signal on Engine 2

1. Possible Causes

PS12 Sense Line
ECU [4000KS]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 72-23-00-000-006	Removal of the PS12 Line
AMM 72-23-00-000-040	Removal of the PS12 Line
AMM 72-23-00-280-002	Inspection/Check of the PS12 line
AMM 72-23-00-280-003	Inspection/Check of the PS12 Line
AMM 72-23-00-400-006	Installation of the PS12 Line
AMM 72-23-00-400-040	Installation of the PS12 Line
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)

3. Fault Confirmation
Subtask 73-20-00-710-148-A ** ON A/C NOT FOR ALL

A. Test
(1) Not applicable, the fault is evident.

4. Fault Isolation
Subtask 73-20-00-810-116-A ** ON A/C NOT FOR ALL

A. Test
(1) Inspect the PS12 Sense Line for loose connections, broken tubes and brackets or blocked ports AMM 72-23-00-280-003.
(a) If damage is found:

replace, retighten or repair PS12 Sense Line AMM 72-23-00-000-006, AMM 72-23-00-400-006.

(b) If nothing is found:

continue the troubleshooting as follows.

(2) Do an operational test of the ECU [4000KS]
(a) If the test gives the maintenance message PS12 SENS LINE, ECU:

replace the ECU AMM 73-21-60-000-001 AMM 73-21-60-400-001.

(b) If the test does not give the maintenance message:

no action is required.

Subtask 73-20-00-810-116-B ** ON A/C NOT FOR ALL

A. Test
(1) Inspect the PS12 Sense Line for loose connections, broken tubes and brackets or blocked ports AMM 72-23-00-280-002.
(a) If damage is found:

replace, retighten or repair PS12 Sense Line AMM 72-23-00-000-040, AMM 72-23-00-400-040.

(b) If nothing is found:

continue the troubleshooting as follows.

(2) Do an operational test of the ECU [4000KS]
(a) If the test gives the maintenance message ECU (PS12 SENSOR):

replace the ECU AMM 73-21-60-000-001 AMM 73-21-60-400-001.

(b) If the test does not give the maintenance message:

no action is required.

[Rev.8 from Aug 2018] 2026.04.04 04:35:23 UTC