Failure of the Ignition A and Ignition B Systems on Engine 1

TASK 74-00-00-810-805-A
Failure of the Ignition A and Ignition B Systems on Engine 1

1. Possible Causes

ECU [4000KS]
J1 wiring
J2 wiring
left or right igniter
left or right ignition lead
lower or upper exciter box
EIU-1 [1KS1]
4000KS

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 73-11-40-000-001	Removal of the Fuel Nozzles
AMM 73-11-40-000-002	Removal of the Fuel Nozzle for SAC Engines
AMM 73-11-40-400-001	Installation of the Fuel Nozzles
AMM 73-11-40-400-002	Installation of the Fuel Nozzle 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 73-25-34-000-040	Removal of the Engine Interface Unit (EIU)
AMM 73-25-34-400-040	Installation of the Engine Interface Unit (EIU)
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 74-11-10-000-001	Removal of the Ignition Exciter
AMM 74-11-10-000-002	Removal of the Ignition Exciter
AMM 74-11-10-400-001	Installation of the Ignition Exciter
AMM 74-11-10-400-002	Installation of the Ignition Exciter
AMM 74-21-10-000-001	Removal of the Right Ignition Lead
AMM 74-21-10-000-002	Removal of the Right Ignition Lead
AMM 74-21-10-400-001	Installation of the Right Ignition Lead
AMM 74-21-10-400-002	Installation of the Right Ignition Lead
AMM 74-21-20-000-001	Removal of the Left Ignition Lead
AMM 74-21-20-000-002	Removal of the Left Ignition Lead
AMM 74-21-20-400-001	Installation of the Left Ignition Lead
AMM 74-21-20-400-002	Installation of the Left Ignition Lead
AMM 74-21-30-000-001	Removal of the Spark Igniter
AMM 74-21-30-000-002	Removal of the Spark Igniter
AMM 74-21-30-400-001	Installation of the Spark Igniter
AMM 74-21-30-400-002	Installation of the Spark Igniter
ASM 743101

3. Fault Confirmation
Subtask 74-00-00-710-058-A ** ON A/C NOT FOR ALL

A. Do an operational test of the ignition system to do an aural check of the igniter plug operation AMM 74-00-00-710-040.

4. Fault Isolation
Subtask 74-00-00-810-054-A ** ON A/C NOT FOR ALL

A. If the Fault Symptom is identified by the maintenance message IGN1, ECU and IGN2, ECU:
(1) If the igniters operate correctly:

replace the ECU [4000KS] AMM 73-21-60-000-001 and AMM 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 AMM 74-21-30-000-001 and AMM 74-21-30-400-001.

(4) If the fault continues:

replace the defective left or right ignition lead AMM 74-21-20-000-001, AMM 74-21-20-400-001 or AMM 74-21-10-000-001, AMM 74-21-10-400-001.

(5) If the fault continues:

replace the defective lower or upper exciter box AMM 74-11-10-000-001 and AMM 74-11-10-400-001.

(6) If the fault continues:

Make sure that there is no ground signal at the EIU-1 (1KS1) pin AA/5B ASM 743101.

(7) If the fault continues:

replace the EIU-1 [1KS1] AMM 73-25-34-000-040 and AMM 73-25-34-400-040.

(8) If the fault continues:

replace the 4000KS AMM 73-21-60-000-001 and AMM 73-21-60-400-001.

(9) If the fault continues:

replace the fuel nozzles in the igniter areas (fuel nozzles 7, 8, 14 and 15) AMM 73-11-40-000-001 and AMM 73-11-40-400-001.

Subtask 74-00-00-810-054-B ** ON A/C NOT FOR ALL

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 AMM 74-00-00-710-043.

(1) If the igniters operate correctly:

replace the ECU [4000KS] AMM 73-21-60-000-001 and AMM 73-21-60-400-001.