Fuel System
Warning: Fuel line spills and leaks are dangerous. Fuel can ignite and cause serious injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete the "Fuel Line Safety Procedures".Fuel Line Pressure Inspection
1. Disconnect the negative battery cable.
2. Connect a fuel pressure gauge between the fuel filter (high pressure side) and fuel distribution.
3. Connect the negative battery cable.
4. Connect data link connector terminals F/P and GND by using a jumper wire.
5. Turn the ignition switch to ON and measure the fuel line pressure.
Specification: 270-310 kPa (39-45 psi)
6. Turn off the ignition switch and disconnect the jumper wire.
7. If the pressure is higher than specified, check the fuel pump maximum pressure.
If normal, check the pressure regulator, or fuel return hose is clogged.
8. If the pressure is lower than specified, measure the fuel line pressure with pinching the return hose.
^ If the fuel line pressure quickly increases, check the pressure regulator and PRC solenoid valve.
^ If the fuel line pressure gradually increases, check the fuel pump maximum pressure.
If the pressure is normal, check the clogging between fuel pump and pressure regulator.
Fuel Pressure Hold Inspection
1. Disconnect the negative battery cable.
2. Connect a fuel pressure gauge between the fuel filter (high pressure side) and fuel distributor.
3. Connect the negative battery cable.
4. Connect data link connector terminals F/P and GND by using a jumper wire.
5. Turn the ignition switch to ON for approx. 10 sec. to operate the fuel pump.
6. Turn off the ignition switch. Wait for 5 min., and measure the fuel pressure.
Specification: More than 150 kPa (21 psi)
7. Disconnect the jumper wire.
8. If the pressure is lower than specified, measure the fuel line pressure with pinching the return hose.
^ If the fuel line pressure holds, replace the pressure regulator.
^ If the fuel line pressure dose not hold, check the fuel pump fuel hold pressure. If the fuel pump fuel hold pressure is normal, check the fuel leaks from fuel line and fuel injector.
Fuel Pump Operation Inspection
1. Connect data link connector terminals F/P and GND by using a jumper wire.
2. Remove the fuel filler cap.
3. Turn the ignition switch to ON and verify that the fuel pump operation sound is heard.
4. Disconnect the jumper wire.
5. If no operation sound is heard, measure the voltage at harness side fuel pump connector terminal B.
Voltage:
Battery positive voltage (Ignition switch ON)
6. If not as specified, check the fuel pump relay.
7. If the fuel pump relay is normal, check the following.
^ Continuity of the fuel pump relay
^ Wiring harnesses and connectors between the ignition switch, main relay, fuel pump relay, and fuel pump