_
R - clean the connector and receptacle with a bristle brush and
R stoddard solvent (Material No. CP2011) (Ref. AMM TASK 73-21-50-210-002).
- do the electrical resistance test through the T12 temperature sensor between: . pins 1 and 2 (160 to 250 ohms) . pin 1 and the ground (>10 megohms).
3 If the resistance values are out of the specified limits:
_
- replace the T12 temperature sensor (Ref. AMM TASK 73-21-40-000-001) and (Ref. AMM TASK 73-21-40-400-001).
4 If the resistance values are in the specified limits:
_
- connect the harness HJ9 to the T12 temperature sensor (C92 connector),
- disconnect the harness HJ9 from the ECU (4000KS) (Ref. ASM 73-25/18).
- visually examine the receptacle and the connector for damaged pins and contamination (Ref. AMM TASK 73-21-50-210-002).
a If damage is found:
_
- repair or replace as required.
b If no damage is found:
_
R - clean the connector and receptacle with a bristle brush
R and stoddard solvent (Material No. CP2011) (Ref. AMM TASK 73-21-50-210-002).
- do the electrical resistance test through the harness HJ9 between: . pins 18 and 19 (160 to 250 ohms) . pins 18 and 7 (>10 megohms) . pin 18 and the ground (>10 megohms).
c 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).
d If the resistance values are out of the specified limits:
_
- replace the harness HJ9 (Ref. AMM TASK 73-21-50-000-042) and (Ref. AMM TASK 73-21-50-400-042).
B. Do the test given in Para. 3.
(1) No additional 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 73-20-00-810-862
Loss of T12 Sensor Signal through the Channel A on Engine 2
1. Possible Causes
_______________
- T12 temperature sensor
- ECU (4000KS)
- harness HJ9
2. Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific bristle brush
B. Consumable Materials
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
Material No. CP2011 *
stoddard solvent (Ref. 70-30-00)
C. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 73-21-40-000-001 Removal of the T12 Temperature Sensor AMM 73-21-40-400-001 Installation of the T12 Temperature Sensor AMM 73-21-50-000-042 Removal of the HJ9 Harness AMM 73-21-50-210-002 Visual Inspection of the Wiring Harnesses AMM 73-21-50-400-042 Installation of the HJ9 Harness 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) AMM 73-29-00-710-040 Operational Test of the FADEC on the Ground (with
Engine non Motoring)
ASM 73-25/18
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).
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4. Fault Isolation
_______________
A. The failure message is generated if channel A input from the T12 temperature sensor is invalid or out of range.
(1) If the failure messsage T12 SNSR, J9, ECU is not confirmed:
- replace the T12 temperature sensor (Ref. AMM TASK 73-21-40-000-001) and (Ref. AMM TASK 73-21-40-400-001).
NOTE : Such a failure can be intermittent and therefore requires the
____ replacement of the T12 temperature sensor as a first maintenance action.
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