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OIL QUANTITY INDICATING SYSTEM - FAULT ISOLATION PROCEDURES
___________________________________________________________
TASK 79-31-00-810-811
R Loss of the Signal of the FADEC Oil Temperature Sensor to the ECU on Engine 1 R Channel A
1. Possible Causes
_______________
R - oil temperature sensor R - harness HJ13
- ECU (4000KS)
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
R AMM AMM AMM AMM AMM 73-21-50-000-046 73-21-50-210-001 73-21-50-400-046 73-21-60-000-001 73-21-60-400-001
R AMM 73-29-00-710-040
R R R R AMM AMM ASM 79-31-40-000-001 79-31-40-400-001 73-25/18
3. Fault Confirmation__________________
Removal of the HJ13 Harness
Visual Inspection of the Wiring Harness
Installation of the HJ13 Harness
Removal 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 Oil Temperature Sensor (IDG Cooling System
Control Sensor)
Installation Oil Temperature Sensor (IDG Cooling
System Control Sensor)
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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R A. This fault message is generated if the output signal is lost from the ECU R dedicated oil temperature sensor used for the fuel return valve control. R NOTE : This sensor is not used for the oil temperature indication in the
____ R cockpit.
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R (1) If the test gives the maintenance message EOT SNSR, J13, ECU:
R - disconnect the connector of the harness HJ13 from the oil
R temperature sensor and do a resistance check of the sensor (Ref.
R ASM 73-25/18) between:
R . pins 1 and 2 (0.5 to 10 ohms)
R . pins 3 and 4 (0.5 to 10 ohms)
R . pins 2 and 5 (>1 megohm)
R . pins 3 and 5 (>1 megohm)
R . pin 1 and the ground (>1 megohm)
R . pin 4 and the ground (>1 megohm).
R (a) If the resistance values are out of the specified limits:
R - replace the oil temperature sensor (Ref. AMM TASK 79-31-40-000-R 001) and (Ref. AMM TASK 79-31-40-400-001).
R (b) If the resistance values are in the specified limits:
R - connect the harness HJ13 to the oil temperature sensor again,
R - disconnect the connector of the harness HJ13 from the ECU
R (4000KS) and do a resistance check (Ref. ASM 73-25/18) between:
R . pins 10 and 22 (0.5 to 10 ohms)
R . pins 9 and 20 (0.5 to 10 ohms)
R . pins 9 and 21 (>1 megohm)
R . pins 10 and 21 (>1 megohm)
R . pin 9 and the ground (>1 megohm)
R . pin 10 and the ground (>1 megohm).
R 1_ If the resistance values are out of the specified limits:
R - replace the harness HJ13 (Ref. AMM TASK 73-21-50-000-046)
R and (Ref. AMM TASK 73-21-50-400-046).
R 2_ If the resistance values are in the specified limits:
R - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001)
R and (Ref. AMM TASK 73-21-60-400-001).
R (2) If the test does not give the maintenance message EOT SENS, J13, ECU:
R - do a check of the connectors on the harness HJ13 between the ECU
R and the oil temperature sensor for absence of loosening,
R contamination, corrosion or damaged pins or sockets,
R - clean, retighten or replace the harness HJ13 as required (Ref. AMM
TASK 73-21-50-210-001).
R (a) If nothing is found:
R - replace the oil temperature sensor (Ref. AMM TASK 79-31-40-000-R 001) and (Ref. AMM TASK 79-31-40-400-001).
R 1_ If the fault continues:
R - replace the harness HJ13 (Ref. AMM TASK 73-21-50-000-046)
R and (Ref. AMM TASK 73-21-50-400-046).
R a_ If the fault continues:
R - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001)
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