- 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 (8KS1) 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, ENG1 (8KS1) (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 J3 (Ref. AMM TASK 71-51-43-000-046) and (Ref. AMM TASK 71-51-43-400-046).
 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 76-11-00-810-806
 Loss of the TLA Resolver Signal through the Channel A on Engine 2
 1. Possible Causes
_______________
 - A/C electrical wiring

 - CTL UNIT-THROTTLE, ENG2 (8KS2)

 - ECU (4000KS)

 - harness J3

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
AMM 71-51-43-000-046 Removal of the ECU (Channel A) Harness (4211KS)
 AMM 71-51-43-400-046 Installation of the ECU (Channel A) Harness (4211KS)
 AMM 73-21-50-210-002 Visual Inspection of the Wiring Harnesses
 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 76-11-19-000-042 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 2A 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 A TLA resolver
____
 input signal is invalid or out of range.

 (1) If the test does not give the maintenance message TLA SNSR, J3, 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.
　
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