Low-Pressure Fuel Supply Circuit Check
Precautions: Precautions for Fuel System Service · General safety (00)
System Diagram
| [A]: | Fuel feed line | 1. | Fuel tank | 6. | Fuel injector |
| [B]: | Fuel return line | 2. | Fuel filter | 7. | Fuel feed hose (pipe to filter) |
| [C]: | Fuel high pressure line | 3. | Fuel flow actuator | 8. | Fuel feed hose (filter to pump) |
| [D]: | LHD | 4. | High pressure pump | ||
| [E]: | RHD | 5. | Common rail |
Troubleshooting
NOTE:
Before performing the following check, check that battery voltage is 11 V or more.
Before performing the following procedure, observe Precautions for Fuel System Service:D16AA.
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
Preliminary check
1)Check that fuel tank contains correct type of fuel.
Is check result OK?
|
Go to Step 2.
|
Fuel tank contains improper substances (petrol, other fluids). Clean fuel tank and refill it correctly.
|
| 2 |
Preliminary check
1)Check that fuel remaining in tank is more than 5 liters (10.67/8.80 US/Imp pt.).
Is check result OK?
|
Go to Step 3.
|
Add fuel up to more than 5 liters (10.67/8.80 US/Imp pt.).
|
| 3 |
Preliminary check
1)Check the following points.
•Check fuel leakage in fuel circuit.
•Check hoses and pipes for obstructions, damage, leakage, breaks, scratches, etc. •Check fittings and seals for correct installation. •Check for blockages, air or water in fuel system. Is check result OK?
|
Go to Step 4.
|
Repair or, if necessary, replace faulty components.
|
| 4 |
Fuel pump operation check
1)Check fuel pump operation.
Is check result OK?
|
Go to Step 5.
|
|
| 5 |
Fuel pressure check
1)Set ignition “OFF”.
2)Connect special tools to fuel feed hose (pipe to filter) as shown in figure.
3)Within 20 seconds after setting ignition “ON”, check that fuel pressure is within 390 to 450 kPa (4.0 to 4.6 kgf/cm2, 56.6 to 65.3 psi, 3.9 to 4.5 bar).
Is check result OK?
|
End.
|
•If fuel pressure is higher than 450 kPa (4.6 kgf/cm2, 65.3 psi, 4.5 bar), go to Step 6.
•If fuel pressure is lower than 390 kPa (4.0 kgf/cm2, 56.6 psi, 3.9 bar), go to Step 7. |
| 6 |
Fuel pressure check
1)Set ignition “OFF”.
2)Remove special tools connected at Step 5.
3)Connect special tools to fuel feed hose (filter to pump) as shown in figure.
4)Within 20 seconds after setting ignition “ON”, check that fuel pressure.
Is measured fuel pressure lower than 30 kPa (0.3 kgf/cm2, 4.35 psi, 0.3 bar) from value of measured fuel pressure in Step 5?
|
Replace fuel filter.
|
Replace high pressure pump.
|
| 7 |
Fuel pressure check
1)Set ignition “OFF”.
2)Pinch fuel hose at fuel feed hose (filter to pump) by hand to block up fuel flow.
3)Within 20 seconds after setting ignition “ON”, check that fuel pressure is within 720 to 780 kPa (734.2 to 795.4 kgf/cm2, 10,400 to 11,300 psi, 720 to 780 bar).
Is check result OK?
|
Replace high pressure pump.
|
Replace fuel pump.
|
