3. Fault Confirmation
__________________
 A. Do an operational test of the ignition system to do an aural check of the igniter plug operation (Ref. AMM TASK 74-00-00-710-040).
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 4. Fault Isolation
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 A. If the test gives the maintenance message IGN1, ECU and IGN 2, ECU:
 - do an operational test of the ignition system to do an aural check of the igniter plugs operation (Ref. AMM TASK 74-00-00-710-043).
 (1) If the igniters operate correctly:

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

 (2) If the igniters do not operate:

 - do a check for open or short to ground of the J1 wiring between the ECU (4000KS) and the lower exciter box J2 wiring between the ECU (4000KS) and the upper exciter box.
 (a) If the wirings are not correct:
 - repair the defective above wirings.

 (3) If the fault continues:

 - replace the defective left or right igniter (Ref. AMM TASK 74-21-30-000-002) and (Ref. AMM TASK 74-21-30-400-002).

 (4) If the fault continues:

 - replace the defective left or right ignition lead (Ref. AMM TASK 74-21-20-000-002), (Ref. AMM TASK 74-21-20-400-002) or (Ref. AMM TASK 74-21-10-000-002), (Ref. AMM TASK 74-21-10-400-002).

 (5) If the fault continues:

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

 (6) If the fault continues:

 - Make sure that there is no ground signal at the EIU-1 (1KS1) pin AA/5B (Ref. ASM 74-31/01).

 (7) If the fault continues:

 - replace the EIU-1 (1KS1) (Ref. AMM TASK 73-25-34-000-040) and (Ref. AMM TASK 73-25-34-400-040).

 (8) If the fault continues:

 - replace the 4000KS (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
 B. Do the test given in Para. 3.A.
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 TASK 74-00-00-810-806
 Failure of the Ignition A and B Systems on Engine 2
 1. Possible Causes
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 - EIU-2 (1KS2)

 - ECU (4000KS)

 - J1 wiring

 - J2 wiring

 - left or right igniter

 - left or right ignition lead

 - lower or upper exciter box

 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
 ASM 74-31/01

 3. Fault Confirmation
__________________
 A. Do an operational test of the ignition system to do an aural check of the igniter plug operation (Ref. AMM TASK 74-00-00-710-040).
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 4. Fault Isolation
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 A. If the test gives the maintenance messages IGN1, ECU and IGN2, ECU:
　
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