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3. Fault Confirmation
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A. Test
(1) Do the Wet Motoring Check (Ref. AMM TASK 71-00-00-710-002).
(2) Do the operational test of the FADEC 2A on the ground (with engine non motoring) (Ref. AMM TASK 73-29-00-710-040).
4. Fault Isolation
_______________
A. If the test gives the maintenance message J7/J8, HMU (SOV SW)*:
- do a check for open or short to ground of the harnesses J7 and J8 between the ECU (4000KS) and the HMU pins J7 and J8/9, 22 to pins J7 and J8/9, 22 (Ref. ASM 73-25/18).
(1) If one of these wirings is not correct:
- repair the defective above wiring.
(2) If these wirings are correct: R - disconnect the cables J7 and J8 from the HMU. R - install a jumper wire between the pins 9 and 22 on the cables J7 R and J8. R - disconnect the cables J7 and J8 from the ECU (4000KS). R - do a visual inspection of the harness connector and receptacle. R Look for contamination or oxidation or pins that have damage. R - if you find damage, repair or replace as required. R - clean the connector and receptacle with a bristle brush and R stoddard solvent (Material No. CP2011) (Ref. AMM TASK 73-21-50-210-R 002). R - do a resistance check of the cable J7 then J8 at the ECU connectors R between: R
. pins 9 and 22 (< 5 ohms)
. pins 8 and 9 (> 10 megohms)
. pin 9 and the ground (> 10 megohms).
(a) If the resistance values are in the specified limits:
- replace the hydromechanical unit (HMU) (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).
(b) If the resistance values are out of the specified limits:
- replace the defective harness J7 (Ref. AMM TASK 73-21-50-000-040) and (Ref. AMM TASK 73-21-50-400-040) or the defective harness J8 (Ref. AMM TASK 73-21-50-000-041) and (Ref. AMM TASK 73-21-50-400-041).
(3) If the fault continues:
- replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
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TASK 73-20-00-810-901
Loss of the PS13 Sensor Signal on Engine 1
1. Possible Causes
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- ECU (4000KS)
- PS13 line
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION
-------------------------------------------------------------------------------
AMM 72-23-00-280-001 Inspection/Check of the PS13 Line
AMM 73-21-60-000-001 Removal of the Electronic Control Unit (ECU)
AMM 73-21-60-400-001 Installation of the Electronic Control Unit (ECU)
AMM 73-29-00-710-040 Operational Test of the FADEC on the Ground (with
Engine Non motoring)
3. Fault Confirmation
__________________
A. Test
R (1) Do the operational test of the FADEC 1 on the ground (with engine non R motoring) (Ref. AMM TASK 73-29-00-710-040).
4. Fault Isolation
_______________
A. The PS13 signal is part of the PMUX option only used for Engine Condition Monitoring.
NOTE : If the engine is not equipped in a PMUX configuration, you have
____
two options:
- replace the engine Identification Connector by a connector configured as Non PMUX to definitively avoid further generation of this fault message,
- ignore this fault message.
NOTE : The fault message is generated if the PS13 sensor signal is
____
invalid or out of range.
(1) If the maintenance message ECU, PS13 SNSR LINE or ECU, PS13 SNSR LINE* is not confirmed:
(a) No maintenance is required.
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(2) If the maintenance message ECU, PS13 SNSR LINE or ECU, PS13 SNSR LINE* is not confirmed but is repetitive:
- do a check for leak or blocked PS13 line or loose fittings (Ref. AMM TASK 72-23-00-280-001).
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