A. Do the operational test of the FADEC 2A and 2B on the ground (with engine non motoring) (Ref. AMM TASK 73-29-00-710-040).
4. Fault Isolation
_______________
R A. Do this procedure.
R NOTE : The fault is triggered by the ECU if both TLA resolver input
____ R signals on channel A and B are invalid or out of range. Most R probable cause is an electrical wiring failure or an ECU internal R failure.
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R (1) If the test does not give the maintenance messages TLA SNSR, J3, ECU
R and/or TLA SNSR, J4, ECU:
R - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref.
R AMM TASK 73-21-60-400-001).
R (a) If the fault repeats on subsequent flights:
R - replace the CTL UNIT-THROTTLE, ENG2 (8KS2) (Ref. AMM TASK 76-R 11-19-000-042) and (Ref. AMM TASK 76-11-19-400-042).
R 1_ If the fault repeats on subsequent flights:
R - Do a check of the electrical wiring between the throttle
R control unit (8KS2) and the ECU (4000KS) (Ref. ASM 73-
25/12).
R a_ if damage is found:
R - replace or repair the above harness.
R b_ if nothing is found:
R - continue the troubleshooting as follows.
R 2_ Do a continuity and insulation check of this wiring.
R a_ if damage is found:
R - replace or repair the above harness.
R b_ if nothing is found:
R - continue the troubleshooting as follows.
R 3_ Do a pin retention check on connectors sockets.
R a_ if damage is found:
R - replace or repair the above harness.
R b_ if nothing is found:
R - continue the troubleshooting as follows.
R 4_ Do a check for absence of corrosion or contamination. Pay
R particular attention to engine to pylon connectors.
R a_ If damage is found:
R - repair the A/C electrical wiring or replace the J3
R harness (Ref. AMM TASK 71-51-43-000-046) and (Ref. AMM
R TASK 71-51-43-400-046) as required.
R (2) If the test gives the maintenance messages TLA SNSR, J3, ECU and TLA
R SNSR, J4, ECU (confirmed on two channels):
R - Do the two following steps (3) and (4).
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(3) If the test gives the maintenance message TLA SNSR, J3, ECU (confirmed on channel A):
- Disconnect the J3 harness from the ECU (4000KS) receptacle and visually examine the ECU receptacle and the J3 harness connector for damaged pins or contamination (Ref. AMM TASK 73-21-50-210-002).
(a) If damage on a connector is found:
- replace or repair as required.
(b) If nothing is found:
- do an electrical resistance test through the J3 harness between: . pins 17 and 30 (30 to 40 ohms) . pins 5 and 15 (15 to 25 ohms) . pins 29 and 28 (15 to 25 ohms) . pins 17 and 16 (> 10 megohms) . pins 5 and 16 (> 10 megohms) . pins 29 and 16 (> 10 megohms) . pin 17 and the ground (> 10 megohms) . pin 5 and the ground (> 10 megohms) . pin 29 and the ground (> 10 megohms).
1 If the resistance values are in the specified limits:
_
- replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
2 If the resistance values are out of the specified limits:
_ R - disconnect the connector CC at the throttle control unit R (8KS2) and do the resistance check at the throttle control
unit connector between:
. pins A, B (30 to 40 ohms)
. pins C, D (15 to 25 ohms)
. pins E, F (15 to 25 ohms)
.pin A and the ground (> 10 megohms)
.pin B and the ground (> 10 megohms)
.pin C and the ground (> 10 megohms)
a If the resistance values are out of the specified limits:
_
- replace the CTL UNIT-THROTTLE, ENG2 (8KS2) (Ref. AMM TASK 76-11-19-000-042) and (Ref. AMM TASK 76-11-19-400-042).
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