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 E 56 E E E 1 If the fault continues:

_
 - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
 a If the fault continues:
_
 - replace the faulty harness: J9 harness (Ref. AMM TASK 73-21-50-000-042) and (Ref. AMM TASK 73-21-50-400-042), and J10 harness (Ref. AMM TASK 73-21-50-000-043) and (Ref. AMM TASK 73-21-50-400-043).
 C. No test is required for fault repair confirmation.
 - No additionnal maintenance action is required if the fault is not confirmed,

 - Repeat the fault isolation process if the fault continues.

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 TASK 73-20-00-810-963
 Loss of the T25 Sensor Signal on Engine 1
 1. Possible Causes
_______________
 - ECU (4000KS)

 - harness J12

 - harness CJ12R

 - T25 temperature sensor

 2. Job Set-up Information
______________________
R A. Fixtures, Tools, Test and Support Equipment

R -------------------------------------------------------------------------------R REFERENCE QTY DESIGNATION
R -------------------------------------------------------------------------------
R No specific bristle brush

R B. Consumable Materials

R -------------------------------------------------------------------------------R REFERENCE DESIGNATION
R -------------------------------------------------------------------------------
R Material No. CP2011 *
R stoddard solvent (Ref. 70-30-00)

R C. Referenced Information

 -------------------------------------------------------------------------------
REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
R  AMM AMM AMM AMM AMM AMM AMM AMM AMM  73-21-20-000-002 73-21-20-400-002 73-21-50-000-028 73-21-50-000-045 73-21-50-210-002 73-21-50-400-028 73-21-50-400-045 73-21-60-000-001 73-21-60-400-001 
AMM  73-29-00-710-040 
ASM  73-25/18

 F EEFF : ALL E E ECES Removal of the T25 Temperature SensorInstallation of the T25 Temperature SensorRemoval of the CJ12R HarnessRemoval of the HJ12 Harness Visual Inspection of the Wiring HarnessesInstallation of the CJ12R HarnessInstallation of the HJ12 HarnessRemoval of the Electronic Control Unit (ECU)(4000KS)Installation of the Electronic Control Unit (ECU)(4000KS)Operational Test of the FADEC on the Ground (with Engine non Motoring)
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 3. Fault Confirmation
__________________
 A. Test
 (1) Do the operational test of the FADEC 1B on the ground (with engine non motoring) (Ref. AMM TASK 73-29-00-710-040).
 4. Fault Isolation
_______________
 A. If the test of the channel B gives the maintenance message T25 SNSR, J12, ECU or T25 SNSR, J12, ECU*:
 - do a check for open or short to ground of the harness J12 between the ECU (4000KS) and the 6 o' clock junction box, between the 6 o'clock junction box and the T25 temperature sensor pins J12/19, 37, 38 to pins J12/1, 2, 3 (Ref. ASM 73-25/18).
 (1) If the wiring is not correct:
 - repair the above wiring.
 (2) If the wiring is correct: R - disconnect the harness J12 from the ECU (4000KS). R - do a visual inspection of the harness connector and receptacle. R Look for contamination or oxidation or pins that have damage. R - if you find damage, repair or replace as required. R - clean the connector and receptacle with a bristle brush and R stoddard solvent (Material No. CP2011) (Ref. AMM TASK 73-21-50-210-R 002). R - do a check of the ECU cable resistance between: R
 . pins 37 and 38 (160 to 250 Ohms) . pins 37 and 19 (> 10 Megohms) . pin 37 and the ground (> 10 Megohms).
 (a) 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).
 (b) If the resistance values are out of the specified limits: R - disconnect the harness CJ12 at the 6 o'clock junction box. R - do a visual inspection of the harness connector and receptacle. R Look for contamination or oxidation or pins that have damage. R - if you find damage, repair or replace as required. R - clean the connector and receptacle with a bristle brush and R stoddard solvent (Material No. CP2011) (Ref. AMM TASK 73-21-50-R 210-002). R - do a check of the resistance of the cable CJ12R between: R
　
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