W DOC AIRBUS | TSM A320F

Loss of the P25 Sensor Signal on Engine 2

TASK 73-20-00-810-954-A
Loss of the P25 Sensor Signal on Engine 2

1. Possible Causes
  • P25 sensor and sense line
  • ECU [4000KS]
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
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)
AMM 73-21-80-210-001
Visual Inspection of the P25 Probe
AMM 73-21-80-210-002
Visual Inspection of the P25 Sensor
AMM 73-29-00-710-040
Operational Test of the FADEC on the ground (with Engine Motoring)
3. Fault Confirmation
Subtask 73-20-00-710-277-A ** ON A/C NOT FOR ALL
A. Test
   (1) Do the operational test of the FADEC 2B on the ground (with engine non motoring) AMM 73-29-00-710-040.
Subtask 73-20-00-710-277-B ** ON A/C NOT FOR ALL
A. Test
   (1) 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 73-20-00-810-236-A ** ON A/C NOT FOR ALL
A. The P25 signal is part of the PMUX option only used for Engine Condition Monitoring.
NOTE: If the engine is not equipped in a PMUX configuration, you have two options:
  • replace the engine Identification Connector by a connector configured as Non PMUX to definitively avoid further generation of this fault message,
  • ignore this fault message.
NOTE: The fault message is generated if the P25 sensor signal is invalid or out of range.
   (1) If the maintenance message P25 SENS LINE, ECU is not confirmed:
     (a) No maintenance is required.
   (2) If the maintenance message P25 SENS LINE, ECU is confirmed or is not confirmed but is repetitive:
  • do a check for leak or blocked P25 sensor and sense line or loose fittings in the fan cowl area.
     (a) If nothing is found or if the fault continues:
     (b) If the fault continues:
Subtask 73-20-00-810-236-B ** ON A/C NOT FOR ALL
A. The P25 signal is part of the PMUX option only used for Engine Condition Monitoring.
NOTE: If the engine is not equipped in a PMUX configuration, you have two options:
  • replace the engine Identification Connector by a connector configured as Non PMUX to definitively avoid further generation of this fault message,
  • ignore this fault message.
NOTE: The fault message is generated if the P25 sensor signal is invalid or out of range.
   (1) If the maintenance message P25 SNSR LINE, ECU or P25 SNSR LINE, ECU* is not confirmed:
     (a) No maintenance is required.
   (2) If the maintenance message P25 SNSR LINE, ECU or P25 SNSR LINE, ECU* is not confirmed but is repetitive:
  • do a check for leak or blocked P25 sensor and sense line or loose fittings in the fan cowl area.
     (a) If nothing is found or if the fault continues:
     (b) If the fault continues:
Subtask 73-20-00-810-236-C ** ON A/C NOT FOR ALL
A. The P25 signal is part of the PMUX option only used for Engine Condition Monitoring.
NOTE: If the engine is not equipped in a PMUX configuration, you have two options:
  • replace the engine Identification Connector by a connector configured as Non PMUX to definitively avoid further generation of this fault message,
  • ignore this fault message.
NOTE: The fault message is generated if the P25 sensor signal is invalid or out of range.
   (1) If the maintenance message P25 SNSR LINE, ECU or P25 SNSR LINE, ECU* is not confirmed:
     (a) No maintenance is required.
   (2) If the maintenance message P25 SNSR LINE, ECU or P25 SNSR LINE, ECU* is not confirmed but is repetitive:
  • do a check for leak or blocked P25 sensor and sense line or loose fittings in the fan cowl area.
     (a) If nothing is found or if the fault continues:
     (b) If the fault continues:
Subtask 73-20-00-710-313-A ** ON A/C NOT FOR ALL
B. Do the test given in Para. 3.A.
   (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 04:35:30 UTC
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