(2) If the circuit breaker (2KS2) is open, refer to Para. 4.A.(2).

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 A. If the test gives the maintenance message EIU - 28V, ECU:
 - do a check of the status of the circuit breaker (2KS2).
 (1) If the circuit breaker is closed:
 - disconnect the connector J1 from the ECU (4000KS) and do a check for 28VDC at pin J1/13 with the FADEC GND PWR pushbutton switch released (the ON legend is on) (Ref. ASM 73-25/05).
 (a) If there is 28VDC:

 - replace the EIU-2 (1KS2) (the most possible failure is the EIU 28V relay) (Ref. AMM TASK 73-25-34-000-040) and (Ref. AMM TASK 73-25-34-400-040)

 - replace the ECU (4000KS) (the most possible failure is an ECU diode) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).

 (b) If there is no 28VDC:

 - do a check for 28VDC at EIU 2 (1KS2) pin AC/11 (Ref. ASM 73-25/05).
 1_ If there is no 28VDC:
 - do a check for open or short to ground at the aircraft
 wiring from the circuit breaker (2KS2) to EIU 2 (1KS2) pins
 AC/11.

 a If there is a short to ground:
_ - repair the above wiring.

 b If there is no short to ground:
_ - replace the C/B-ENGINE/2/FADEC A/AND EIU 2 (2KS2).

 2 If there is 28VDC:
_

 - do a check for open or short to ground at the harness J1 between the EIU 2 (1KS2) and the ECU (4000KS), pin AC/7 to pin J1/13. Replace the harness J1 if necessary (Ref. ASM 73-25/05).
 3 If the fault continues:
_

 - make sure that there is no ground signal at EIU 2 (1KS2) pin AA/5B (Ref. ASM 73-25/08).
 (c) If the fault continues:
 - replace the EIU-2 (1KS2) (Ref. AMM TASK 73-25-34-000-040) and (Ref. AMM TASK 73-25-34-400-040).
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 - close the circuit breaker.
 (a) If the circuit breaker trips:

 - replace the EIU-2 (1KS2) (Ref. AMM TASK 73-25-34-000-040) and (Ref. AMM TASK 73-25-34-400-040)

 - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).

 (b) If the fault continues:

 - do a check for a short to ground at the harness J1 between the EIU 2 (1KS2) and the ECU (4000KS), pin AC/7 to pin J1/13.
 1 If there is a short to ground:
_ - replace the defective harness J1.

 2 If there is no short to ground:
_

 - do a check for a short to ground at the aircraft wiring between EIU 2 (1KS2) pins AC/11 and the circuit breakers (2KS2).
 a If there is a short to ground:
_ - repair the above wiring.

 b If there is no short to ground:
_

 - replace the defective C/B-ENGINE/2/FADEC A/AND EIU 2 (2KS2).
 B. Do the test given in Para. 3.B.
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 TASK 73-25-00-810-916
 Loss of Weight on Wheels Signal on the System 1
 1. Possible Causes
_______________
 - P0 port

 - PS12 sense line

 - LGCIU

 - EIU-1 (1KS1)

 - ECU (4000KS)

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
AMM 72-23-00-000-040 Removal of the PS12 Line
 AMM 72-23-00-280-002 Inspection/Check of the PS12 line
 AMM 72-23-00-400-040 Installation of the PS12 Line
 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)
　
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