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 4. Fault Isolation
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 A. The failure message IGN2, ECU is generated if there is no light off detected 10 seconds after the fuel is turned on.
 (1) If an audible spark cannot be heard on the left igniter plug (B):
 - replace the left igniter plug (B) (Ref. AMM TASK 74-21-30-000-002) and (Ref. AMM TASK 74-21-30-400-002).
 (a) If an audible spark is not heard: R - replace the left ignition lead (Ref. AMM TASK 74-21-20-000-002) R and (Ref. AMM TASK 74-21-20-400-002).

 (b) If an audible spark is not heard:

 - replace the lower exciter box (Ref. AMM TASK 74-11-10-000-002) and (Ref. AMM TASK 74-11-10-400-002).

 (c) If an audible spark is not heard:

 - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).

 (d) If an audible spark is not heard:

 - replace the EIU-2 (1KS2) (Ref. AMM TASK 73-25-34-000-040) and (Ref. AMM TASK 73-25-34-400-040).

 (2) If an audible spark can be heard on the left igniter plug (B): R - replace the left ignition lead (Ref. AMM TASK 74-21-20-000-002) and R (Ref. AMM TASK 74-21-20-400-002).

 (3) If an audible spark can be heard on the left igniter plug (B), but the failure message is repetitive:
 - do the following steps after trouble shooting per steps Para. 4.A.(2). has been fully done,

 - replace the igniter B (left igniter plug) (Ref. AMM TASK 74-21-30-000-002) and (Ref. AMM TASK 74-21-30-400-002).

 (a) If the fault continues during subsequent flights:

 - replace the lower exciter box (Ref. AMM TASK 74-11-10-000-002) and (Ref. AMM TASK 74-11-10-400-002).

 (b) If the fault continues during subsequent flights:

 - replace the HJ2 harness (Ref. AMM TASK 71-52-43-000-004) and (Ref. AMM TASK 71-52-43-400-004).

 (c) If the fault continues during subsequent flights:

 - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).

 (d) If the fault continues during subsequent flights:

 - replace the EIU-2 (1KS2) (Ref. AMM TASK 73-25-34-000-040) and (Ref. AMM TASK 73-25-34-400-040).
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 (1) No additional maintenance action is required if the fault is not confirmed.

 (2) Repeat the fault isolation procedure if the fault continues.

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 TASK 74-00-00-810-805
 Failure of the Ignition A and Ignition B Systems on Engine 1
 1. Possible Causes
_______________
 - EIU-1 (1KS1)

 - ECU (4000KS)

 - J1 wiring

 - J2 wiring

 - left or right igniter

 - left or right ignition lead

 - lower or upper exciter box

 - 4000KS

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
R AMM 73-21-60-000-001 Removal of the Electronic Control Unit (ECU)(4000KS) AMM 73-21-60-400-001 Installation of the Electronic Control Unit R (ECU)(4000KS) AMM 73-25-34-000-040 Removal of the Engine Interface Unit (EIU) (1KS1,1KS2) AMM 73-25-34-400-040 Installation of the Engine Interface Unit (EIU)
 (1KS1,1KS2) AMM 74-00-00-710-040 Operational Test of the Ignition System AMM 74-00-00-710-043 Operational Test of the Ignition System AMM 74-11-10-000-002 Removal of the Ignition Exciter (4000JH1, 4000JH2) AMM 74-11-10-400-002 Installation of the Ignition Exciter (4000JH1,
 4000JH2)
 AMM 74-21-10-000-002 Removal of the Right Ignition Lead
 AMM 74-21-10-400-002 Installation of the Right Ignition Lead
 AMM 74-21-20-000-002 Removal of the Left Ignition Lead
 AMM 74-21-20-400-002 Installation of the Left Ignition Lead
 AMM 74-21-30-000-002 Removal of the Spark Igniter
 AMM 74-21-30-400-002 Installation of the Spark Igniter
　
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