W DOC AIRBUS | TSM A320F

Loss of T12 Sensor Signal through the Two Channels on Engine 2

TASK 73-20-00-810-860-A
Loss of T12 Sensor Signal through the Two Channels on Engine 2

1. Possible Causes
  • ECU [4000KS]
  • harness J9
  • harness J10
  • engine 2 T12 temperature sensor
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
AR
BRUSH - BRISTLED
 B. Consumable Materials
REFERENCE
DESIGNATION
(Material No.CP2011)
stoddard solvent
 C. Referenced Information
REFERENCE
DESIGNATION
AMM 73-21-40-000-001
Removal of the T12 Temperature Sensor
AMM 73-21-40-000-040
Removal of the T12 Temperature Sensor
AMM 73-21-40-400-001
Installation of the T12 Temperature Sensor
AMM 73-21-40-400-040
Installation of the T12 Temperature Sensor
AMM 73-21-50-000-008
Removal of the J9 Harness
AMM 73-21-50-000-009
Removal of the J10 Harness
AMM 73-21-50-000-042
Removal of the HJ9 Harness for SAC Engines
AMM 73-21-50-000-043
Removal of the HJ10 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 73-21-50-400-008
Installation of the J9 Harness
AMM 73-21-50-400-009
Installation of the J10 Harness
AMM 73-21-50-400-042
Installation of the HJ9 Harness for SAC Engines
AMM 73-21-50-400-043
Installation of the HJ10 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)
3. Fault Confirmation
Subtask 73-20-00-710-136-A ** ON A/C NOT FOR ALL
A. Do the operational test of the FADEC 2A and 2B on the ground (with engine non motoring) AMM 73-29-00-710-040.
4. Fault Isolation
Subtask 73-20-00-810-110-A ** ON A/C NOT FOR ALL
A. If the test gives the maintenance messages T12 SENS, J9, ECU + T12 SENS, J10, ECU:
  • do a check for open or short to ground at pins J9 and J10/7, 18, 19 to pins J9 and J10/1, 2, 3 of the harnesses J9 and J10 between the ECU (4000KS) and the T12 sensor, ASM 732518.
   (1) If one of these wirings is not correct:
  • repair the defective harness J9 or J10.
   (2) If these wirings are correct:
  • disconnect the harnesses J9 and J10 from the ECU (4000KS).
  • do a visual inspection of the harness connector and receptacle. Look for contamination or oxidation or pins that have damage.
  • if you find damage, repair or replace as required.
  • clean the connector and receptacle with a BRUSH - BRISTLED and stoddard solvent (Material No.CP2011) AMM 73-21-50-210-001.
  • do a check of the ECU cables resistance between:
    . pins 18 and 19 (160 to 250 Ohms)
    . pins 18 and 7 (> 10 Megohms)
    . pin 18 and the ground (> 10 Megohms).
     (a) If the resistance values are in the specified limits:
     (b) If the resistance values are out of the specified limits:
  • disconnect the harnesses J9 and J10 from the T12 sensor.
  • do a visual inspection of the harness connector and receptacle. Look for contamination or oxidation or pins that have damage.
  • if you find damage, repair or replace as required.
  • clean the connector and receptacle with a BRUSH - BRISTLED and stoddard solvent (Material No.CP2011) AMM 73-21-50-210-001.
  • do a check of the T12 sensor resistance between:
    . pins 1 and 2 (160 to 250 Ohms)
    . pin 1 and the ground (> 10 Megohms).
       1 If the resistance values are in the specified limits:
       2 If the resistance values are out of the specified limits:
Subtask 73-20-00-810-110-B ** ON A/C NOT FOR ALL
A. If the test gives the maintenance messages T12 SNSR, J9, ECU + T12 SNSR, J10, ECU:
  • do a check for open or short to ground at pins J9 and J10/7, 18, 19 to pins J9 and J10/1, 2, 3 of the harnesses J9 and J10 between the ECU (4000KS) and the T12 sensor, ASM 732518.
   (1) If one of these wirings is not correct:
  • repair the defective harness J9 or J10.
   (2) If these wirings are correct:
  • disconnect the harnesses J9 and J10 from the ECU (4000KS).
  • do a visual inspection of the harness connector and receptacle. Look for contamination or oxidation or pins that have damage.
  • if you find damage, repair or replace as required.
  • clean the connector and receptacle with a BRUSH - BRISTLED and stoddard solvent (Material No.CP2011) AMM 73-21-50-210-001.
  • do a check of the ECU cables resistance between:
    . pins 18 and 19 (160 to 250 Ohms)
    . pins 18 and 7 (> 10 Megohms)
    . pin 18 and the ground (> 10 Megohms).
     (a) If the resistance values are in the specified limits:
     (b) If the resistance values are out of the specified limits:
  • disconnect the harnesses J9 and J10 from the T12 sensor.
  • do a visual inspection of the harness connector and receptacle. Look for contamination or oxidation or pins that have damage.
  • if you find damage, repair or replace as required.
  • clean the connector and receptacle with a BRUSH - BRISTLED and stoddard solvent (Material No.CP2011) AMM 73-21-50-210-001.
  • do a check of the T12 sensor resistance between:
    . pins 1 and 2 (160 to 250 Ohms)
    . pin 1 and the ground (> 10 Megohms).
       1 If the resistance values are in the specified limits:
       2 If the resistance values are out of the specified limits:
Subtask 73-20-00-810-110-C ** ON A/C NOT FOR ALL
A. If the test gives the maintenance messages T12 SNSR, J9, ECU + T12 SNSR, J10, ECU:
  • do a check for open or short to ground at pins J9 and J10/7, 18, 19 to pins J9 and J10/1, 2, 3 of the harnesses J9 and J10 between the ECU (4000KS) and the T12 sensor, ASM 732518.
   (1) If one of these wirings is not correct:
  • repair the defective harness J9 or J10.
   (2) If these wirings are correct:
  • disconnect the harnesses J9 and J10 from the ECU (4000KS).
  • do a visual inspection of the harness connector and receptacle. Look for contamination or oxidation or pins that have damage.
  • if you find damage, repair or replace as required.
  • clean the connector and receptacle with a BRUSH - BRISTLED and stoddard solvent (Material No.CP2011) AMM 73-21-50-210-002.
  • do a check of the ECU cables resistance between:
    . pins 18 and 19 (160 to 250 Ohms)
    . pins 18 and 7 (> 10 Megohms)
    . pin 18 and the ground (> 10 Megohms).
     (a) If the resistance values are in the specified limits:
     (b) If the resistance values are out of the specified limits:
  • disconnect the harnesses J9 and J10 from the T12 sensor.
  • do a visual inspection of the harness connector and receptacle. Look for contamination or oxidation or pins that have damage.
  • if you find damage, repair or replace as required.
  • clean the connector and receptacle with a BRUSH - BRISTLED and stoddard solvent (Material No.CP2011) AMM 73-21-50-210-002.
  • do a check of the T12 sensor resistance between:
    . pins 1 and 2 (160 to 250 Ohms)
    . pin 1 and the ground (> 10 Megohms).
       1 If the resistance values are in the specified limits:
       2 If the resistance values are out of the specified limits:
Subtask 73-20-00-710-137-A ** ON A/C NOT FOR ALL
B. Do the test given in Para. 3.A.
[Rev.8 from Aug 2018] 2026.04.04 04:35:22 UTC
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