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 E 56 E E E (b) If there is not this message:

 - look for failure message relative to ADIRU 1 or ADIRU 2 or pitot or static probes.
 1 If there is a message:
_
 - do the applicable trouble shooting procedure.
 2 If there is no message:
_
 - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
 B. No additional maintenance action is required if the fault is not
 confirmed.

 (1) Repeat the fault isolation procedure if the fault continues.
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 N2 Exceedance Indication on ECAM on Engine 1
 1. Possible Causes
_______________
 - SENSOR-N2 ROTATIONAL SPD (4001EV)

 - HJ7/HJ8 harness

 - ECU (4000KS)

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
77-00-00-810-851 N2 Overlimit on Engine 1 or 2 AMM 73-21-50-000-008 Removal of the J9 Harness AMM 73-21-50-000-009 Removal of the J10 Harness AMM 73-21-50-400-008 Installation of the J9 Harness AMM 73-21-50-400-009 Installation of the J10 Harness 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 77-11-20-000-002 Removal of the N2 Speed Sensor (4001EV). AMM 77-11-20-400-002 Installation of the N2 Speed Sensor (4001EV).
 3. Fault Confirmation
__________________
 A. Test
 (1) Not applicable.
 4. Fault Isolation
_______________
 A. This indication is set if the N2 speed has exceeded the limit (Red line). This indication may be spurious if it is not associated to the ECAM warning ENG 1 N2 OVERLIMIT.
 (1) If this indication was associated to the ECAM warning ENG 1 N2 OVERLIMIT, do the trouble shooting procedure relative to this ECAM warning (Ref. TASK 77-00-00-810-851).

 (2) If this indication was not associated to the ECAM warning ENG 1 N2 OVERLIMIT, and not associated to any engine malfunction such as N1 auto acceleration, N1 OVERLIMIT, N1 fluctuations:

 (a) no action is required, the indication is spurious.
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 - do the applicable trouble shooting procedure. Refer to the crew observation entry or ECAM warning entry ATA 77.
 (3) If the fault becomes repetitive:
 - inspect the HJ7/HJ8 harness and associated connectors to the N2 speed sensor and ECU for signs of looseness, damage or contamination. Clean, repair or replace as required (Ref. AMM TASK 73-21-50-000-008) and (Ref. AMM TASK 73-21-50-400-008) and (Ref. AMM TASK 73-21-50-000-009) and (Ref. AMM TASK 73-21-50-400-009).
 (a) If nothing is found:

 - replace the SENSOR-N2 ROTATIONAL SPD (4001EV) (Ref. AMM TASK 77-11-20-000-002) and (Ref. AMM TASK 77-11-20-400-002).

 (b) If the fault continues:

 - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
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 N2 Exceedance Indication on ECAM on Engine 2
 1. Possible Causes
_______________
 - SENSOR-N2 ROTATIONAL SPD (4001EV)

 - HJ7/HJ8 harness

 - ECU (4000KS)

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
77-00-00-810-851 N2 Overlimit on Engine 1 or 2 AMM 73-21-50-000-008 Removal of the J9 Harness AMM 73-21-50-000-009 Removal of the J10 Harness AMM 73-21-50-400-008 Installation of the J9 Harness AMM 73-21-50-400-009 Installation of the J10 Harness 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 77-11-20-000-002 Removal of the N2 Speed Sensor (4001EV). AMM 77-11-20-400-002 Installation of the N2 Speed Sensor (4001EV).
　
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