W DOC AIRBUS | TSM A320F

Loss of N1 Feedback Signal - Engine 1 - Channel A and Channel B

TASK 77-10-00-810-813-A
Loss of N1 Feedback Signal - Engine 1 - Channel A and Channel B

1. Possible Causes
  • SENSOR-N1 ROTATIONAL SPD [4000EV]
  • ECU [4000KS]
  • J9 harness
  • J10 harness
  • HJ9 harness
  • HJ10 harness
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 73-21-50-000-008
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)
AMM 73-29-00-710-040
Operational Test of the FADEC on the ground (with Engine Motoring)
AMM 77-11-10-000-001
Removal of the N1 Speed Sensor
AMM 77-11-10-000-002
Removal of the N1 Speed Sensor
AMM 77-11-10-400-001
Installation of the N1 Speed Sensor
AMM 77-11-10-400-002
Installation of the N1 Speed Sensor
3. Fault Confirmation
Subtask 77-10-00-710-074-A ** ON A/C NOT FOR ALL
A. Do the operational test of the FADEC 1A and 1B on the ground (with engine non motoring) AMM 73-29-00-710-040.
4. Fault Isolation
Subtask 77-10-00-810-062-A ** ON A/C NOT FOR ALL
A. The failure message is generated if both channel A and channel B signals are invalid or out of range.
   (1) If the failure messages N1 SENS, J9, ECU and N1 SENS, J10, ECU are not confirmed:
     (a) No maintenance action is required.
   (2) If the failure messages N1 SENS, J9, ECU and N1 SENS, J10, ECU are not confirmed but are repetitive:
  • disconnect J9 harness from the N1 sensor (N1-A connector) and disconnect J10 harness from the N1 sensor (N1-B connector).
     (a) Visually examine the receptacles and the connectors for damaged pins or contamination AMM 73-21-50-210-001.
       1 If damage is found:
  • repair or replace as required.
       2 If no damage is found:
  • do a cleaning of the connectors and receptacles using a BRUSH - BRISTLED with stoddard solvent (Material No.CP2011) AMM 73-21-50-210-001.
     (b) If the failure continues during the subsequent flights:
     (c) If the failure continues during the subsequent flights:
     (d) If the failure continues during the subsequent flights:
     (e) If the failure continues during the subsequent flights:
   (3) If the failure message N1 SENS, J9, ECU is confirmed:
  • disconnect the J9 harness from the N1 sensor (N1-A connector).
     (a) Visually examine the receptacles and the connectors for damaged pins or contamination AMM 73-21-50-210-001.
       1 If damage is found:
  • repair or replace as required.
       2 If no damage is found:
  • do the electrical resistance test through the N1 sensor (4000EV) (channel A) between:
    . pins 1 and 2 (40 to 80 ohms)

    for S/N different than 25451 and up
    . pins 1 and 3 (>5 kiloohms)
    . pin 1 and the ground (>10 megohms)

    for S/N 25451 and up
    . pins 1 and 3 (>10 megohms)
    . pin 1 and the ground (>10 megohms).
         a If the resistance values are out of the specified limits:
         b If the resistance values are in the specified limits:
  • connect the J9 harness to the N1 sensor.
     (b) Disconnect connector J9 from the ECU (4000KS) receptacle and visually examine the receptacles and the connectors for damaged pins or contamination AMM 73-21-50-210-001.
       1 If damage is found:
  • repair or replace as required.
       2 If no damage is found:
  • do the electrical resistance test through the J9 harness between:
    . pins 16 and 17 (40 to 80 ohms)

    for S/N different than 25451 and up
    . pins 16 and 6 (>5 kiloohms)
    . pin 16 and the ground (>10 megohms)

    for S/N 25451 and up
    . pins 16 and 6 (>10 megohms)
    . pin 16 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:
   (4) If the failure message N1 SENS, J10, ECU is confirmed:
  • disconnect the J10 harness from the N1 sensor (N1-B connector).
     (a) Visually examine the receptacles and the connectors for damaged pins or contamination AMM 73-21-50-210-001.
       1 If damage is found:
  • repair or replace as required.
       2 If no damage is found:
  • do the electrical resistance test through the N1 sensor (4000EV) (channel B) between:
    . pins 1 and 2 (40 to 80 ohms)

    for S/N different than 25451 and up
    . pins 1 and 3 (>5 kiloohms)
    . pin 1 and the ground (>10 megohms)

    for S/N 25451 and up
    . pins 1 and 3 (>10 megohms)
    . pin 1 and the ground (>10 megohms).
         a If the resistance values are out of the specified limits:
         b If the resistance values are in the specified limits:
  • connect the J10 harness to the N1 sensor.
     (b) Disconnect connector J10 from the ECU (4000KS) receptacle and visually examine the receptacles and the connectors for damaged pins or contamination AMM 73-21-50-210-001.
       1 If damage is found:
  • repair or replace as required.
       2 If no damage is found:
  • do the electrical resistance test through the J10 harness between:
    . pins 16 and 17 (40 to 80 ohms)

    for S/N different than 25451 and up
    . pins 16 and 6 (>5 kiloohms)
    . pin 16 and the ground (>10 megohms)

    for S/N 25451 and up
    . pins 16 and 6 (>10 megohms)
    . pin 16 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:
Subtask 77-10-00-810-062-B ** ON A/C NOT FOR ALL
A. The failure message is generated if both channel A and channel B signals are invalid or out of range.
   (1) If the failure messages N1 SNSR, J9, ECU and N1 SNSR, J10, ECU are not confirmed:
     (a) No maintenance action is required.
   (2) If the failure messages N1 SNSR, J9, ECU and N1 SNSR, J10, ECU are not confirmed but are repetitive:
  • disconnect J9 harness from the N1 sensor (N1-A connector) and disconnect J10 harness from the N1 sensor (N1-B connector).
     (a) Visually examine the receptacles and the connectors for damaged pins or contamination AMM 73-21-50-210-001.
       1 If damage is found:
  • repair or replace as required.
       2 If no damage is found:
  • do a cleaning of the connectors and receptacles using a BRUSH - BRISTLED with stoddard solvent (Material No.CP2011) AMM 73-21-50-210-001.
     (b) If the failure continues during the subsequent flights:
     (c) If the failure continues during the subsequent flights:
     (d) If the failure continues during the subsequent flights:
     (e) If the failure continues during the subsequent flights:
   (3) If the failure message N1 SNSR, J9, ECU is confirmed:
  • disconnect the J9 harness from the N1 sensor (N1-A connector).
     (a) Visually examine the receptacles and the connectors for damaged pins or contamination AMM 73-21-50-210-001.
       1 If damage is found:
  • repair or replace as required.
       2 If no damage is found:
  • do the electrical resistance test through the N1 sensor (4000EV) (channel A) between:
    . pins 1 and 2 (40 to 80 ohms)

    for S/N different than 25451 and up
    . pins 1 and 3 (>5 kiloohms)
    . pin 1 and the ground (>10 megohms)

    for S/N 25451 and up
    . pins 1 and 3 (>10 megohms)
    . pin 1 and the ground (>10 megohms).
         a If the resistance values are out of the specified limits:
         b If the resistance values are in the specified limits:
  • connect the J9 harness to the N1 sensor.
     (b) Disconnect connector J9 from the ECU (4000KS) receptacle and visually examine the receptacles and the connectors for damaged pins or contamination AMM 73-21-50-210-001.
       1 If damage is found:
  • repair or replace as required.
       2 If no damage is found:
  • do the electrical resistance test through the J9 harness between:
    . pins 16 and 17 (40 to 80 ohms)

    for S/N different than 25451 and up
    . pins 16 and 6 (>5 kiloohms)
    . pin 16 and the ground (>10 megohms)

    for S/N 25451 and up
    . pins 16 and 6 (>10 megohms)
    . pin 16 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:
   (4) If the failure message N1 SNSR, J10, ECU is confirmed:
  • disconnect the J10 harness from the N1 sensor (N1-B connector).
     (a) Visually examine the receptacles and the connectors for damaged pins or contamination AMM 73-21-50-210-001.
       1 If damage is found:
  • repair or replace as required.
       2 If no damage is found:
  • do the electrical resistance test through the N1 sensor (4000EV) (channel B) between:
    . pins 1 and 2 (40 to 80 ohms)

    for S/N different than 25451 and up
    . pins 1 and 3 (>5 kiloohms)
    . pin 1 and the ground (>10 megohms)

    for S/N 25451 and up
    . pins 1 and 3 (>10 megohms)
    . pin 1 and the ground (>10 megohms).
         a If the resistance values are out of the specified limits:
         b If the resistance values are in the specified limits:
  • connect the J10 harness to the N1 sensor.
     (b) Disconnect connector J10 from the ECU (4000KS) receptacle and visually examine the receptacles and the connectors for damaged pins or contamination AMM 73-21-50-210-001.
       1 If damage is found:
  • repair or replace as required.
       2 If no damage is found:
  • do the electrical resistance test through the J10 harness between:
    . pins 16 and 17 (40 to 80 ohms)

    for S/N different than 25451 and up
    . pins 16 and 6 (>5 kiloohms)
    . pin 16 and the ground (>10 megohms)

    for S/N 25451 and up
    . pins 16 and 6 (>10 megohms)
    . pin 16 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:
Subtask 77-10-00-810-062-C ** ON A/C NOT FOR ALL
A. The failure message is generated if both channel A and channel B signals are invalid or out of range.
   (1) If the failure messages N1 SNSR, J9, ECU and N1 SNSR, J10, ECU are not confirmed:
     (a) No maintenance action is required.
   (2) If the failure messages N1 SNSR, J9, ECU and N1 SNSR, J10, ECU are not confirmed but are repetitive:
  • disconnect HJ9 harness from the N1 sensor (N1-A connector) and disconnect HJ10 harness from the N1 sensor (N1-B connector).
     (a) Visually examine the receptacles and the connectors for damaged pins or contamination AMM 73-21-50-210-002.
       1 If damage is found:
  • repair or replace as required.
       2 If no damage is found:
  • do a cleaning of the connectors and receptacles using a BRUSH - BRISTLED with stoddard solvent (Material No.CP2011) AMM 73-21-50-210-002.
     (b) If the failure continues during the subsequent flights:
     (c) If the failure continues during the subsequent flights:
     (d) If the failure continues during the subsequent flights:
     (e) If the failure continues during the subsequent flights:
   (3) If the failure message N1 SNSR, J9, ECU is confirmed:
  • disconnect the HJ9 harness from the N1 sensor (N1-A connector).
     (a) Visually examine the receptacles and the connectors for damaged pins or contamination AMM 73-21-50-210-002.
       1 If damage is found:
  • repair or replace as required.
       2 If no damage is found:
  • do the electrical resistance test through the N1 sensor (4000EV) (channel A) between:
    . pins 1 and 2 (40 to 80 ohms)

    for S/N different than 25451 and up
    . pins 1 and 3 (>5 kiloohms)
    . pin 1 and the ground (>10 megohms)

    for S/N 25451 and up
    . pins 1 and 3 (>10 megohms)
    . pin 1 and the ground (>10 megohms).
         a If the resistance values are out of the specified limits:
         b If the resistance values are in the specified limits.
  • connect the HJ9 harness to the N1 sensor.
     (b) Disconnect connector HJ9 from the ECU (4000KS) receptacle and visually examine the receptacles and the connectors for damaged pins or contamination AMM 73-21-50-210-002.
       1 If damage is found:
  • repair or replace as required.
       2 If no damage is found:
  • do the electrical resistance test through the HJ9 harness between:
    . pins 16 and 17 (40 to 80 ohms)

    for S/N different than 25451 and up
    . pins 16 and 6 (>5 kiloohms)
    . pin 16 and the ground (>10 megohms)

    for S/N 25451 and up
    . pins 16 and 6 (>10 megohms)
    . pin 16 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:
   (4) If the failure message N1 SNSR, J10, ECU is confirmed:
  • disconnect the HJ10 harness from the N1 sensor (N1-B connector).
     (a) Visually examine the receptacles and the connectors for damaged pins or contamination AMM 73-21-50-210-002.
       1 If damage is found:
  • repair or replace as required.
       2 If no damage is found:
  • do the electrical resistance test through the N1 sensor (4000EV) (channel B) between:
    . pins 1 and 2 (40 to 80 ohms)

    for S/N different than 25451 and up
    . pins 1 and 3 (>5 kiloohms)
    . pin 1 and the ground (>10 megohms)

    for S/N 25451 and up
    . pins 1 and 3 (>10 megohms)
    . pin 1 and the ground (>10 megohms).
         a If the resistance values are out of the specified limits:
         b If the resistance values are in the specified limits:
  • connect the HJ10 harness to the N1 sensor.
     (b) Disconnect connector HJ10 from the ECU (4000KS) receptacle and visually examine the receptacles and the connectors for damaged pins or contamination AMM 73-21-50-210-002.
       1 If damage is found:
  • repair or replace as required.
       2 If no damage is found:
  • do the electrical resistance test through the J10 harness between:
    . pins 16 and 17 (40 to 80 ohms)

    for S/N different than 25451 and up
    . pins 16 and 6 (>5 kiloohms)
    . pin 16 and the ground (>10 megohms)

    for S/N 25451 and up
    . pins 16 and 6 (>10 megohms)
    . pin 16 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:
Subtask 77-10-00-710-075-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 04:37:36 UTC
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