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3. Fault Confirmation
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A. Test
(1) 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
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A. The fault is generated when the ECU detects an open circuit or a short to ground on the fuel return valve solenoid for second level cooling or on associated electrical harness.
(1) If the test does not give the maintenance message J7, FRV(SOL 2), ECU or if the fault is repetitive:
- Inspect the harness J7 and associated connectors to the fuel return valve and ECU for sign of looseness, damage or contamination (Ref. ASM 78-25/18). Pay particular attention on pins 32 and 15 at the connector to the ECU and at pins 5 and 6 at the connector to the fuel return valve.
- Re-tighten, clean or replace harness as required.
(a) If no defect is found either or on the harness or the connector no further action is due.
(b) If the fault continues or is repetitive:
- Replace the fuel return valve (Ref. AMM TASK 73-11-50-000-002) and (Ref. AMM TASK 73-11-50-400-002).
(c) If the fault continues:
- Replace the harness J7 (Ref. AMM TASK 73-21-50-000-040) and (Ref. AMM TASK 73-21-50-400-040).
(d) If the fault continues:
- Replace the ECU (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
(2) If the test gives the maintenance message J7, FRV(SOL 2), ECU: R - disconnect the harness J7 from the ECU. 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 on the harness J7 between: R
. pins 32 and 15 (18 to 38 ohms) . pins 32 and 33 (> 10 megohms) . pin 32 and the ground (> 10 megohms).
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(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: R - disconnect the harness J7 from the fuel return valve. 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-R 210-002). R - do a resistance check between: R
. pins 5 and 6 (18 to 38 ohms) . pin 5 and the ground (> 10 megohms)
1 If the resistance values are out of the specified limits:
_
- replace the fuel return valve (Ref. AMM TASK 73-11-50-000-002) and (Ref. AMM TASK 73-11-50-400-002).
2 If the resistance values are in the specified limits:
_
- replace the harness J7 (Ref. AMM TASK 73-21-50-000-040) and (Ref. AMM TASK 73-21-50-400-040).
B. Do the test given in Para. 3.A.
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TASK 73-20-00-810-911
Failure of the Control of the Solenoid 2 of the Fuel Return Valve on Channel B, Engine 1
1. Possible Causes
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- ECU (4000KS)
- fuel return valve
- harness J8
2. Job Set-up Information
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R A. Fixtures, Tools, Test and Support Equipment
R -------------------------------------------------------------------------------R REFERENCE QTY DESIGNATION
R -------------------------------------------------------------------------------
R No specific bristle brush
R B. Consumable Materials
R -------------------------------------------------------------------------------R REFERENCE DESIGNATION
R -------------------------------------------------------------------------------
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