- replace or repair as necessary.

 (b) If nothing is found:

 - Disconnect the J13 harness from the ECU (4000KS), and visually examine the ECU receptacle and the harness connector for damaged pins or contamination (Ref. AMM TASK 73-21-50-210-001).
 1 If damage is found:
_ - repair or replace as required.
 2 If nothing is found, continue the troubleshooting as follows.
_
 (3) Do a visual inspection of the J13 and CJ13 harnesses connectors for looseness.
 (a) If a connector is found loose:

 - do a cleanning of the connector and the receptacle using a bristle brush and stoddart solvant (CP 2011) or white spirit (CP 2010) (Ref. AMM TASK 73-21-50-210-001)

 (b) If nothing is found:

 - do a visual inspection of the T495 probes lead assemblies and check for damage.
 1 If damage is found:
_
 - repair or replace damaged hardware as required.
 (4) If the fault continues during the subsequent flight:
 - Do an electrical resistance test through the Main Electrical Junction Box between: . pins A and B (1 to 10 ohms) . pin A and the ground (> 20 megohms)
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 (a) If the resistances are out of the specified limits:

 - Do an electrical resistance test of the T495 thermocouple wiring harness (probes lead assemblies and extension leads assemblies) (Ref. AMM TASK 77-21-10-200-001)
 (b) If the resistances are in the specified limits:
 - replace the CJ13 Harness (Ref. AMM TASK 73-21-50-000-005) and (Ref. AMM TASK 73-21-50-400-005).
 (5) If the fault continues during the subsequent flight:

 - Replace the Main Junction Box assembly (Ref. AMM TASK 77-21-10-000-002) and (Ref. AMM TASK 77-21-10-400-002).

 (6) If the fault continues during the subsequent flight:

 - Replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).

 (7) If the fault continues during the subsequent flight:

 - Replace the J13 Harness (Ref. AMM TASK 73-21-50-000-012) and (Ref. AMM TASK 73-21-50-400-012).
 5. Close-up________
 A. Do a minimum idle check (Ref. AMM TASK 71-00-00-710-006).
 (1) Repeat the fault isolation procedure, if the fault continues.
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 The EGT indication fluctuates while other parameters are stable
 1. Possible Causes_______________
 - T495 probes

 - Main Electrical Junction Box

 - CJ13 Harness

 - ECU (4000KS)

 - J13 Harness

 2. Job Set-up Information______________________
 A. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE  DESIGNATION
 -------------------------------------------------------------------------------
AMM 71-00-00-710-006  Minimum Idle Check
 AMM 73-21-50-000-005  Removal of the CJ13 Harness
 AMM 73-21-50-000-012  Removal of the J13 Harness
 AMM 73-21-50-210-001  Visual Inspection of the Wiring Harness
 AMM 73-21-50-400-005  Installation of the CJ13 Harness
 AMM 73-21-50-400-012  Installation of the J13 Harness
 AMM 73-21-60-000-001  Removal of the Electronic Control Unit (ECU)(4000KS)
 AMM 73-21-60-400-001  Installation of the Electronic Control Unit (ECU)(4000KS)
 AMM 73-21-60-740-007  Correct Time Limited Faults (Non Asterisked) of the Engine Scheduled Maintenance Report
 AMM 77-21-10-000-002  Removal of the Main Junction Box
 AMM 77-21-10-200-001  Inspection/Check of the T495 Thermocouple Wiring Harness
 AMM 77-21-10-400-002  Installation of the Main Junction Box
 3. Fault Confirmation__________________
 A. Test
 (1) Not applicable.
 NOTE : Most likely cause for an EGT fluctuation (while other
____ parameters are stable) is oxidation deposit on the CJ13 harness connector onto the junction box receptacle. Therefore, as a first attempt to fix the fault, the connector/receptacle (CJ13 harness connector and Main Junction Box receptacle) must be cleaned per procedure here below.
　
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