TASK 73-20-00-810-857
Loss of T25 Sensor Signal through the Two Channels on Engine 1
1. Possible Causes
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- ECU (4000KS)
- harness J11
- harness J12
- harness CJ11R
- harness CJ12R
- engine 1 T25 temperature sensor
2. Job Set-up Information
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R A. Fixtures, Tools, Test and Support Equipment
R -------------------------------------------------------------------------------R REFERENCE QTY DESIGNATION
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R No specific bristle brush
R B. Consumable Materials
R -------------------------------------------------------------------------------R REFERENCE DESIGNATION
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R Material No. CP2011 *
R stoddard solvent (Ref. 70-30-00)
R C. Referenced Information
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REFERENCE DESIGNATION
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AMM 73-21-20-000-002
AMM 73-21-20-400-002
AMM 73-21-50-000-026
AMM 73-21-50-000-028
AMM 73-21-50-000-044
AMM 73-21-50-000-045
R AMM 73-21-50-210-002
AMM 73-21-50-400-026
AMM 73-21-50-400-028
AMM 73-21-50-400-044
AMM 73-21-50-400-045
AMM 73-21-60-000-001
AMM 73-21-60-400-001
F EEFF : ALL E E ECES Removal of the T25 Temperature SensorInstallation of the T25 Temperature SensorRemoval of the CJ11R HarnessRemoval of the CJ12R HarnessRemoval of the HJ11 HarnessRemoval of the HJ12 Harness Visual Inspection of the Wiring HarnessesInstallation of the CJ11R HarnessInstallation of the CJ12R HarnessInstallation of the HJ11 HarnessInstallation of the HJ12 HarnessRemoval of the Electronic Control Unit (ECU)(4000KS)Installation of the Electronic Control Unit (ECU)(4000KS)
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REFERENCE DESIGNATION
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AMM 73-29-00-710-040 Operational Test of the FADEC on the Ground (with Engine non Motoring)
3. Fault Confirmation
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A. Do the operational test of the FADEC 1A and 1B on the ground (withe engine non motoring) (Ref. AMM TASK 73-29-00-710-040).
4. Fault Isolation
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A. If the test gives the maintenance messages T25 SNSR, J11, ECU + T25 SNSR, J12, ECU:
- do a check for open or short to ground of the harnesses J11 and 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 J11 and J12/19, 37, 38 to pins J11 and J2/1, 2, 3.
(1) If one of these wirings is not correct:
- repair the defective above wirings.
(2) If these wirings are correct: R - disconnect the harnesses J11 and J2 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 each ECU cable resistance between: R
. pins 37 and 38 (160 to 250 Ohms)
. pins 37 and 19 (> 10 Megohms)
. pin 37 and 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) (Ref. AMM TASK 73-21-60-400-001).
(b) If the resistance values are out of the specified limits: R - disconnect the harnesses CJ11 and CJ12 at 6 o'clock junction R 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 cables CJ11R and CJ12R between:
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