Fuel Pressure Check: Troubleshooting

NOTE: Before using the following flow chart, check that battery voltage is higher than 11 V. If it is lower, fuel pressure becomes lower than specification even if fuel pump and line are in good condition.

DIAGNOSTIC PROCEDURE CHART

Step	Action	YES	NO
1	Was "Fuel Pump and Its Circuit Check" performed?	Go to Step 2.	Go to FUEL PUMP AND ITS CIRCUIT CHECK .
2	Fuel pressure check 1 Check fuel pressure, see FUEL PRESSURE BASIC CHECK . Is check result satisfactory?	Go to Step 3.	Go to Step 6.
3	Fuel pressure check 2 Start engine and warm up to normal operating temperature. Keep engine speed at 4, 000 rpm. Does fuel pressure show about same value as Step 2?	Go to Step 4.	Go to Step 6.
4	Fuel line check Check fuel pipe and joint for fuel leakage, damage or deformation. Are they in good condition?	Fuel system is in good condition.	Repair defective part.
5	Was check result higher than specification in Step 2?	Replace fuel pump assembly, see FUEL PUMP ASSEMBLY REMOVAL AND INSTALLATION .	Go to Step 6.
6	Fuel line check Check fuel pipe and joint for damage or deformation. Are they in good condition?	Clogged fuel filter, faulty fuel pump, faulty fuel pressure regulator or fuel leakage from pipe connection in fuel tank.	Repair defective part.