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 (2) If the failure message T12 SNSR, J9, ECU is not confirmed but is repetitive:
 - do the following procedure after the replacement of the T12 temperature sensor.
 (a) Disconnect the harness HJ9 from the T12 temperature sensor (C92 connector) (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).
 1 If damage is found:
_ - repair or replace as required.
 2 If no damage is found:
_
 - do a cleaning of the connectors using a bristle brush and stoddard solvent (Material No. CP2011) (Ref. AMM TASK 73-21-50-210-002).
 3 If the fault continues during the subsequent flights:
_
 - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
 4 If the fault continues during the subsequent flights:
_
 - replace the harness HJ9 (Ref. AMM TASK 73-21-50-000-042) and (Ref. AMM TASK 73-21-50-400-042).
 (3) If the failure message T12 SNSR, J9, ECU is confirmed:
 - replace the T12 temperature sensor (Ref. AMM TASK 73-21-40-000-001) and (Ref. AMM TASK 73-21-40-400-001).
 (a) Disconnect the harness HJ9 from the T12 temperature sensor (C92 connector) (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).
 1 If damage is found:
_ - repair or replace as required.
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 2 If no damage is found:

_
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 73-20-00-810-863
 Loss of T12 Sensor Signal through the Channel B on Engine 1
 1. Possible Causes
_______________
 - T12 temperature sensor

 - ECU (4000KS)

 - harness HJ10

 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  *
　
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