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R  (b) If the fault continues during subsequent flights: 
R  - replace the HJ1 harness (Ref. AMM TASK 71-52-43-000-004) and 
R  (Ref. AMM TASK 71-52-43-400-004). 
R  (c) If the fault continues during subsequent flights: 
R  - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and 
R  (Ref. AMM TASK 73-21-60-400-001). 
R  (d) If the fault continues during subsequent flights: 
R  - replace the EIU-1 (1KS1) (Ref. AMM TASK 73-25-34-000-040) and 
R  (Ref. AMM TASK 73-25-34-400-040). 
R 
R  B. Do the test given in Para. 3.A. 
R  (1) No additional maintenance action is required if the fault is not 
R  confirmed. 
R  (2) Repeat the fault isolation procedure if the fault continues.

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 TASK 74-00-00-810-802
R Failure of the Ignition 1 System - Engine 2 - Channel A or Channel B
 1. Possible Causes
_______________
R R - right igniter plug (A) R
 - right ignition lead
 - upper exciter box R - ECU (4000KS) R - HJ1 harness R - EIU-2 (1KS2)
 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
R  AMM  71-52-43-000-004 
R 
R  AMM  71-52-43-400-004 
R 
R  AMM  73-21-60-000-001 
R  AMM  73-21-60-400-001 
R  AMM  73-25-34-000-040 
R  AMM  73-25-34-400-040 
AMM  74-00-00-710-040 
R
 AMM  74-11-10-000-002 
AMM  74-11-10-400-002 
AMM  74-21-10-000-002 
AMM  74-21-10-400-002 
AMM  74-21-30-000-002 
AMM  74-21-30-400-002 
R
 3. Fault Confirmation__________________ 

Removal of the Environmental Control System (ECS)
Harness
Installation of the Environmental Control System
(ECS) Harness
Removal of the Electronic Control Unit (ECU)
Installation of the Electronic Control Unit (ECU)
Removal of the Engine Interface Unit (EIU)
Installation of the Engine Interface Unit (EIU)
Operational Test of the Ignition System

Removal of the Ignition Exciter (4000JH1, 4000JH2)
Installation of the Ignition Exciter (4000JH1,
 4000JH2)
Removal of the Right Ignition Lead
Installation of the Right Ignition Lead
Removal of the Spark Igniter
Installation of the Spark Igniter

R A. Do the operational test of the ignition system, by performing an aural
R check of the igniter plug operation (Ref. AMM TASK 74-00-00-710-040).

R NOTE : The igniter test will spark the right igniter plug (A) for 10
____ R seconds, wait 2 seconds then spark the left igniter plug (B) for R 10 seconds. This test provides for an aural feedback of proper R ignition operation . No CFDS test results are available.
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R
 4. Fault Isolation
_______________
R A. The failure message IGN1, ECU is generated if there is no light off
R detected 10 seconds after the fuel is turned on.

R (1) If an audible spark cannot be heard on the right igniter plug (A):
R - replace the right igniter plug (A) (Ref. AMM TASK 74-21-30-000-002)
R and (Ref. AMM TASK 74-21-30-400-002).

R (a) If an audible spark is not heard:
R - replace the right ignition lead (Ref. AMM TASK 74-21-10-000-R 002) and (Ref. AMM TASK 74-21-10-400-002).

R (b) If an audible spark is not heard:
R - replace the upper exciter box (Ref. AMM TASK 74-11-10-000-002)
R and (Ref. AMM TASK 74-11-10-400-002).

R (c) If an audible spark is not heard:
　
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