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R R R (2) If the test gives the failure messages TLA SNSR, J3, ECU and/or TLA SNSR, J4, ECU: - Do the related troubleshooting procedure.
R **ON A/C ALL
B. Do the test given in Para. 3.A.
(1) No additionnal 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 76-11-00-810-813
Disagree between the two TLA Resolver Signals on Engine 1
1. Possible Causes
_______________
- A/C electrical wiring
- J3 harness
- J4 harness
- CTL UNIT-THROTTLE, ENG1 (8KS1)
- ECU (4000KS)
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 71-51-44-000-004 Removal of the Electronic Control Unit (ECU) Channel A Harness 238W0904 AMM 71-51-44-000-005 Removal of the Electronic Control Unit (ECU) Channel B Harness 238W0904 AMM 71-51-44-400-004 Installation of the Electronic Control Unit (ECU) Channel A Harness 238W0904 AMM 71-51-44-400-005 Installation of the Electronic Control Unit (ECU)
Channel B Harness 238W0904 AMM 73-21-50-210-001 Visual Inspection of the Wiring Harness 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
(ECU)(4000KS) AMM 73-29-00-710-040 Operational Test of the FADEC on the Ground (with
Engine non Motoring) AMM 76-11-19-000-040 Removal of the Throttle Control Unit (8KS1, 8KS2) AMM 76-11-19-400-040 Installation of the Throttle Control Unit (8KS1,
8KS2)
ASM 73-25/12
3. Fault Confirmation
__________________
A. Do the operational test of the FADEC 1A and 1B on the ground (with engine non motoring) (Ref. AMM TASK 73-29-00-710-040).
4. Fault Isolation
_______________
A. Do this procedure.
NOTE : The fault is triggered by the ECU if both TLA resolver input
____ signals on channel A and B disagree. Most probable cause is an electrical wiring failure.
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(1) If the test does not give the maintenance messages TLA SNSR, J3, ECU and TLA SNSR, J4, ECU:
(a) Do a check of the electrical wiring between the throttle control unit (8KS1) and the ECU (4000KS) (Ref. ASM 73-25/12).
1 if damage is found:
_
- replace or repair the above harness.
2 if nothing is found:
_ - continue the troubleshooting.
(b) Do a continuity and insulation check of this wiring.
1 if damage is found:
_
- replace or repair the above harness.
2 if nothing is found:
_ - continue the troubleshooting.
(c) Do a pin retention check on connectors sockets.
1 if damage is found:
_
- replace or repair the above harness.
2 if nothing is found:
_ - continue the troubleshooting.
(d) Do a check for absence of corrosion or contamination. Pay
particular attention to engine to pylon connectors.
1 If damage is found:
_
- repair the A/C electrical wiring or replace the J3 harness (Ref. AMM TASK 71-51-44-000-004) and (Ref. AMM TASK 71-51-44-400-004) or J4 harness (Ref. AMM TASK 71-51-44-000-005) and (Ref. AMM TASK 71-51-44-400-005) as required.
2 If nothing is found:
_
- replace the CTL UNIT-THROTTLE, ENG1 (8KS1) (Ref. AMM TASK 76-11-19-000-040) and (Ref. AMM TASK 76-11-19-400-040).
a if the fault repeats on subsequent flights:
_
- replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
(2) If the test gives the maintenance messages TLA SNSR, J3, ECU and TLA SNSR, J4, ECU (confirmed on two channels):
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