Análisis de las infracciones como origen de las multas fiscales

a Testing tools for fuel pressure

a Test only the fuel pressure in the negative pressure circuits from the fuel supply connec-tor and feed pump and in the low-pressure cir-cuit from the feed pump through the fuel main filter and supply pump.

k Since the pressure in the high-pressure cir-cuit from the fuel supply pump through the common rail to the injector is very high, it cannot be measured.

1. Testing fuel negative pressure circuit pres-sure (fuel supply connector)

1) Remove fuel pressure pickup plug (1) from the fuel supply connector.

2) Connect M10 computer check fitting G4 to fuel vacuum gauge G5.

3) Run the engine at high idle and test the fuel negative pressure circuit pressure.

a If the fuel negative pressure circuit pressure is in the following range, it is normal.

q Standard value of fuel negative pres-sure circuit prespres-sure (fuel supply con-nector):

Max. 27.1 kPa {Max. 203 mmHg}

4) After finishing testing, remove the testing tools and return the removed parts.

3 Fuel pressure pickup plug:

20 – 22 Nm {2.0 – 2.2 kgm}

2. Testing fuel negative pressure circuit pres-sure (supply pump)

1) Remove fuel pressure pickup plug (2) from the supply pump.

Symbol Part No. Part name

G

1 799-101-5002 Hydraulic tester 790-261-1204 Digital hydraulic tester

2 6732-81-3170 Adapter

(10 x 1.0 mm o PT1/8) 6215-81-9710 O-ring

3 799-401-2320 Gauge: 1 MPa {10 kg/cm²} 4 795-790-6210 M10 computer check fitting 5 795-790-1500

Fuel vacuum gauge 799-201-1201

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2) Connect M10 computer check fitting G4 to fuel vacuum gauge G5.

3) Run the engine at high idle and test the fuel negative pressure circuit pressure.

a If the fuel negative pressure circuit pressure is in the following range, it is normal.

q Standard value of fuel negative pres-sure circuit prespres-sure (supply pump):

Max. 33.9 kPa {Max. 254 mmHg}

4) After finishing testing, remove the testing tools and return the removed parts.

3 Fuel pressure pickup plug:

20 – 22 Nm {2.0 – 2.2 kgm}

3. Testing fuel low-pressure circuit pressure (fuel filter inlet side)

1) Remove fuel pressure pickup plug (3) from the fuel main filter inlet side.

2) Install adapter G2 and nipple [1] of hydraulic tester G1 and connect it to gauge G3.

3) Measure fuel low-pressure circuit pres-sure when cranking the engine.

a If the fuel low-pressure circuit pres-sure (at the fuel filter inlet side) is in the following range, it is normal.

q Standard value of fuel low-pressure circuit pressure (fuel filter inlet side):

Min. 0.14 MPa {Min. 1.4 kg/cm²}

k To protect the starting motor, do not continuously crank the engine more than 30 seconds.

4) After finishing testing, remove the testing tools and return the removed parts.

3 Fuel pressure pickup plug:

20 – 22 Nm {2.0 – 2.2 kgm}

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4. Testing fuel low-pressure circuit pressure (fuel filter outlet side)

1) Remove fuel pressure pickup plug (4) from the fuel main filter outlet side.

2) Install adapter G2 and nipple [1] of hydraulic tester G1 and connect it to gauge G3.

3) Run the engine at high idle and measure the fuel low-pressure circuit pressure.

a If the fuel low-pressure circuit pres-sure (at the fuel filter outlet side) is in the following range, it is normal.

q Standard value of fuel low-pressure circuit pressure (fuel filter outlet side):

Min. 0.48 MPa {Min. 4.9 kg/cm²}

4) After finishing testing, remove the testing tools and return the removed parts.

3 Fuel pressure pickup plug:

20 – 22 Nm {2.0 – 2.2 kgm}

5. Testing difference of pressure in front and rear part of fuel filter

1) Remove fuel pressure pickup plug (3) from the fuel main filter inlet side and fuel pressure pickup plug (4) from the outlet side.

2) Install adapter G2 and nipple [1] of hydraulic tester G1 and connect it to gauge G3.

3) Run the engine at high idle and measure the difference of pressure in front and rear part of fuel filter.

q Drop of fuel low-pressure circuit pres-sure =

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a If the drop exceeds the standard value, clogging of the fuel filter is sus-pected.

4) After finishing testing, remove the testing tools and return the removed parts.

3 Fuel pressure pickup plug:

20 – 22 Nm {2.0 – 2.2 kgm}

6. Testing fuel lift pump outlet pressure (sup-ply pump section)

1) Remove fuel pressure pickup plug (2) of the supply pump.

2) Connect M10 computer check fitting G4 to gauge G3.

3) Turn the starting switch ON, operate fuel lift pump (5), and measure the fuel lift pump outlet pressure.

Reference: Fuel lift pump (5) is installed to cooling plate (7) on the back side of engine controller (6).

a The fuel lift pump operates for 30 seconds after the starting switch is turned ON and then stops. Measure the pressure while the pump is operating.

a If the fuel lift pump outlet pressure is in the following standard range, it is normal.

q Standard fuel lift pump outlet pressure (supply pump section):

Min. 34 kPa {0.35 kg/cm²} a If the fuel lift pump outlet pressure is not in the standard range, perform the following checks.

q Check that fuel is in the fuel lift pump.

q If fuel is not in the fuel lift pump just after the fuel filter is replaced or a fuel system part is removed and returned, operate the fuel lift pump 3 – 4 times with the starting switch to bleed air from the fuel circuit and fill the pump with fuel and then measure the outlet pressure again.

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q If the fuel lift pump outlet pressure is not in the standard range while fuel is in the fuel lift pump, remove check valve (8) of engine controller cooling plate (7) and check to see if the valve is seized.

4) After finishing measurement, remove the measuring instruments and return the removed parts.

3 Fuel pressure pickup plug:

20 – 22 Nm {2.0 – 2.2 kgm}

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