- disconnect the HJ13 harness from the CJ13 harness at the 6 o'clock junction box
- do an electrical resistance test through the CJ13 harness between: . pins 7 and 8 (0.5 to 10 ohms) . pins 1 and 10 (0.5 to 10 ohms) . pins 7 and 9 (> 10 megohms) . pins 1 and 9 (> 10 megohms) . pin 7 and the ground (> 10 megohms) . pin 1 and the ground (> 10 megohms).
e If the resistance values are out of the specified limits:
_
- replace the CJ13 harness (Ref. AMM TASK 73-21-50-000-029) and (Ref. AMM TASK 73-21-50-400-029).
f If the resistance values are in the specified limits:
_
- replace the HJ13 harness (Ref. AMM TASK 73-21-50-000-046) and (Ref. AMM TASK 73-21-50-400-046).
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(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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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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4. Fault Isolation
_______________
A. If EGT fluctuations have been reported and other engine parameters were stable:
- Do a check of the Post Flight Report (PFR), of the Schedule Maintenance Report (SMR) or Class 3 Report (Ref. AMM TASK 73-21-60-740-007), and of the FADEC Last Leg Report for a T495 SNSR failure message.
(1) If message is found:
- Do the related troubleshooting procedure.
(2) If nothing is found:
- Disconnect the CJ13 harness from the T495 main junction box (located in the left core compartment), and visually examine the T495 junction box receptacle and the CJ13 harness connector for damaged pins or contamination (Ref. AMM TASK 73-21-50-210-001). Clean the connector and the receptacle using a bristle brush and stoddart solvant (CP 2011) or white spirit (CP 2010).
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