Low-Pressure Fuel Supply Circuit Check
Precautions: Precautions for Fuel System Service · General safety (00)
System Diagram
| 1. | Fuel injector | 3. | Fuel pump assembly | 5. | Fuel pressure sensor |
| 2. | Fuel delivery pipe | 4. | High pressure fuel pump |
Troubleshooting
NOTE:
Before using the following flow chart, check that battery voltage is 11 V or more. If it is lower, fuel pressure becomes lower than specification even if fuel pump and line are in good condition.
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
Was “Fuel Pump and Its Circuit Check” performed?
|
Go to Step 2.
|
|
| 2 |
Fuel pressure check 1
1)Check fuel pressure.
Is check result OK?
|
Go to Step 3.
|
Go to Step 5.
|
| 3 |
Fuel pressure check 2
1)Start engine and warm it up to normal operating temperature.
2)Keep engine speed at 4,000 rpm.
Does fuel pressure show about the same value as Step 2?
|
Go to Step 4.
|
Fuel pressure regulator is in faulty condition. Replace fuel pump assembly.
|
| 4 |
Fuel line check
1)Check fuel pipe and joint for fuel leakage, damage or deformation.
Is check result OK?
|
Low pressure fuel supply circuit is in good condition.
|
Repair defective part.
|
| 5 |
Fuel line check
1)Check fuel pipe and joint for damage or deformation.
Is check result OK?
|
Clogged fuel filter, faulty fuel pump, faulty fuel pressure regulator or fuel leakage from pipe connection in fuel tank.
|
Repair defective part.
|