(ECU)(4000KS) AMM 73-29-00-710-040 Operational Test of the FADEC on the Ground (with
Engine non Motoring) AMM 76-11-19-000-042 Removal of the Throttle Control Unit (8KS1, 8KS2) AMM 76-11-19-400-042 Installation of the Throttle Control Unit (8KS1,
8KS2)
ASM 73-25/12
3. Fault Confirmation
__________________
A. Do the operational test of the FADEC 2B 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 the CHANNEL B TLA resolver
____
input signal is invalid or out of range.
(1) If the test does not give the maintenance message TLA SNSR, J4, ECU:
(a) Do a check of the electrical wiring between the throttle control unit (8KS2) and the ECU (4000KS) (Ref. ASM 73-25/12).
1 if damage is found:
_
- replace or repair the above harness.
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R 2_ if nothing is found:
R - continue the troubleshooting.
R (b) Do a continuity and insulation check of this wiring
R 1_ if damage is found:
R - replace or repair the above harness.
R 2_ if nothing is found:
R - continue the troubleshooting.
R (c) Do a pin retention check on connectors sockets.
R 1_ if damage is found:
R - replace or repair the above harness.
R 2_ if nothing is found:
R - continue the troubleshooting.
R (d) Do a check for absence of corrosion or contamination. Pay
R particular attention to engine to pylon connector.
R 1_ If damage is found:
R - repair the A/C electrical wiring or replace the J4 harness
R as required
R 2_ If nothing is found:
R - replace the CTL UNIT-THROTTLE, ENG2 (8KS2) (Ref. AMM TASK
R 76-11-19-000-042) and (Ref. AMM TASK 76-11-19-400-042).
R a_ if the fault repeats on subsequent flights:
R - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001)
R and (Ref. AMM TASK 73-21-60-400-001).
R (2) If the test gives the maintenance message TLA SNSR, J4, ECU:
R - Disconnect the J4 harness from the ECU (4000KS) receptacle and
R visually examine the ECU receptacle and the J4 harness connector
R for damaged pins or contamination (Ref. AMM TASK 73-21-50-210-002).
R (a) If damage on a connector is found:
R - replace or repair as required.
R (b) If nothing is found:
R - do an electrical resistance test through the J4 harness
R between:
R . pins 17 and 30 (30 to 40 ohms)
R . pins 5 and 15 (15 to 25 ohms)
R . pins 29 and 28 (15 to 25 ohms)
R . pins 17 and 16 (> 10 megohms)
R . pins 5 and 16 (> 10 megohms)
R . pins 29 and 16 (> 10 megohms)
R . pin 17 and the ground (> 10 megohms)
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. 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 DD 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).
b If the resistance values are in the specified limits:
_
- replace the harness J4 (Ref. AMM TASK 71-51-43-000-047) and (Ref. AMM TASK 71-51-43-400-047).
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