Turn the ignition switch ON. The fuel pump will turn for 3
seconds, and then stop.
Do not drive the fuel pump without the fuel in the
Measure the fuel pressure with the engine stopped.
Right after Ignition Switch ON, with pump running:
323 kPa (3.3 kgf/cm², 47 psi)
After 3 seconds from Ignition Switch ON, with pump
265 kPa (2.7 kgf/cm², 38 psi) (residual
The system should hold the residual
pressure about 30 seconds.
Start the engine, and let it idle.
Measure the fuel pressure with the engine idling.
Fuel Pressure (Idling)
333 kPa (3.4 kgf/cm², 48 psi)
The gauge needle will fluctuate. Read the pressure at
the average of the maximum and minimum indications.
If the fuel pressure is normal, the fuel circulation system
(fuel pump, pressure regulator, and fuel passage) is no
faults. Check the DFI electronic control system (injectors,
sensors, crankshaft sensor, and ECU).
If the fuel pressure is much lower than specified, check
Fuel Line Leakage
Fuel Pump Operation (check the sound of the pump)
Amount of Fuel Flow (see Fuel Flow Rate Inspection)
If the fuel pressure is much higher than specified, check
Delivery Pipe Clogging
Remove the fuel pressure gauge and adapter.
Install the fuel tank (see Fuel Tank Installation).
FUEL SYSTEM (DFI) 3-81