Loss of the EGT Thermocouple Signal to the ECU on Engine 1
1. Possible Causes
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- harness HJ13
- ECU (4000KS)
- harness CJ13
- lower left-hand thermocouple lead assembly
- lower right-hand thermocouple lead assembly
- upper left-hand thermocouple lead assembly
- three-probe thermocouple lead assembly
- upper extension lead
- lower extension lead
- main junction box assembly
2. Job Set-up Information
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A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM AMM AMM AMM AMM AMM 73-21-50-000-029 73-21-50-000-046 73-21-50-400-029 73-21-50-400-046 73-21-60-000-001 73-21-60-400-001
AMM 73-29-00-710-040
R AMM AMM AMM AMM AMM AMM AMM AMM 77-21-10-000-008 77-21-10-000-009 77-21-10-000-025 77-21-10-000-026 77-21-10-000-027 77-21-10-000-028 77-21-10-000-029 77-21-10-200-002
R AMM AMM AMM AMM 77-21-10-400-008 77-21-10-400-009 77-21-10-400-025 77-21-10-400-026
AMM 77-21-10-400-027
F EEFF : ALL E E ECES Removal of the CJ13 HarnessRemoval of the HJ13 HarnessInstallation of the CJ13 HarnessInstallation of the HJ13 HarnessRemoval of the Electronic Control Unit (ECU)(4000KS)Installation of the Electronic Control Unit (ECU)(4000KS)Operational Test of the FADEC on the Ground (with Engine non Motoring)Removal of the Upper Extension LeadRemoval of the Lower Extension Lead Removal of the Main Junction BoxRemoval of the Upper Right Thermocouple Lead AssemblyRemoval of the Lower Left Thermocouple Lead AssemblyRemoval of the Upper Left Thermocouple Lead AssemblyRemoval of the Lower Right Thermocouple Lead AssemblyInspection/Check of the T495 Thermocouple Wiring HarnessInstallation of the Upper Extension LeadInstallation of the Lower Extension Lead Installation of the Main Junction BoxInstallation of the Upper Right Thermocouple Lead AssemblyInstallation of the Lower Left Thermocouple Lead Assembly
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REFERENCE DESIGNATION
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AMM 77-21-10-400-028 Installation of the Upper Left Thermocouple Lead Assembly R AMM 77-21-10-400-029 Installation of the Lower Right Thermocouple Lead
Assembly
ASM 73-25/15
AWM 71-51-05
3. Fault Confirmation
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A. Do the operational test of the FADEC 1A on the ground (with 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 message T495 SNSR, J13, ECU:
- do a check for open or short to ground of the T495 thermocouple and of the harness HJ13 between the ECU (4000KS), the 6 o'clock junction box and the T495 thermocouple (Ref. AWM 71-51-05) and (Ref. ASM 73-25/15).
(1) If the wiring is not correct:
- repair the above wiring.
(2) If the wiring is correct:
- disconnect the harness HJ13 from the ECU (4000KS) and do a resistance check of the cable between: . pins 12 and 13 (1 to 10 ohms) . pins 12 and 24 (> 10 megohms) . pin 12 and the 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) and (Ref. AMM TASK 73-21-60-400-001).
(b) If the resistance values are out of the specified limits:
- disconnect the harness CJ13 at the 6 o'clock junction box and do a resistance check of the harness CJ13 between: . pins 3 and 13 (1 to 10 ohms) . pins 3 and 12 (> 10 megohms) . pin 3 and the ground (> 10 megohms).
1 If the resistance values are in the specified limits:
_
- replace the harness HJ13 (Ref. AMM TASK 73-21-50-000-046) and (Ref. AMM TASK 73-21-50-400-046).
2 If the resistance values are out of the specified limits:
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- disconnect the harness CJ13 from the T495 thermocouple and do a resistance check of the T495 thermocouple between: . pins A and B (1 to 10 ohms)
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