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 3. Fault Confirmation
__________________
 A. 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 gives the maintenance message 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
 . pins 15 and 16 (160 to 250 Ohms) . pins 15 and 5 (> 10 Megohms) . pin 15 and the ground (> 10 Megohms).
 1 If the resistance values are in the specified limits:
_
 - replace the harness J12 (Ref. AMM TASK 73-21-50-000-045) and (Ref. AMM TASK 73-21-50-400-045).
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 2 If the resistance values are out of the specified limits:

_ R - disconnect the harness CJ12R at the T25 temperature sensor. R - do a visual inspection of the harness connector and R receptacle. Look for contamination or oxidation or pins that R 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-R 50-210-002). R - do a check of the T25 sensor resistance between: R
 .pins 1 and 2 (160 to 250 Ohms) . pin 1 and the ground (> 10 Megohms).
 a If the resistance values are in the specified limits:
_
 - replace the harness CJ12R (Ref. AMM TASK 73-21-50-000-028) and (Ref. AMM TASK 73-21-50-400-028).
 b If the resistance values are out of the specified limits:
_
 - replace the T25 temperature sensor (Ref. AMM TASK 73-21-20-000-002) and (Ref. AMM TASK 73-21-20-400-002).
 B. Do the test given in Para. 3.A.
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 TASK 73-20-00-810-856
 Loss of the T25 Sensor Signal through the Channel B on Engine 2
 1. Possible Causes
_______________
 - harness J12

 - ECU (4000KS)

 - 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)
　
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