Inspection

Inspection

1. Relieve fuel pressure.

7. A Fuel pressure regulator
8. B Clamp

2. Remove the sealing bolt on the fuel rail while holding the banjo bolt with another wrench and attach the fuel pressure gauge.
3. Start the engine. Measure the fuel pressure with the engine idling and vacuum hose of the pressure regulator disconnected from the fuel pressure regulator and clamped. The fuel pressure should be 280 – 330 kPa.

Note: If the engine will not start, turn the ignition switch ON, wait for two seconds, turn it OFF, then back ON again and read the fuel pressure.

4. Reconnect vacuum hose to the fuel pressure regulator. The fuel pressure should be 220 – 270 kPa.

• If the fuel pressure is not as specified, first check the fuel pump.If the fuel pump is OK, check the following.

5. If the pressure is higher than specified, inspect for:

• Clamped or clogged fuel return hose or piping.
• Faulty fuel pressure regulator.

6. If the fuel pressure is lower than specified, inspect for:

• Clogged fuel filter.
• Leakage in the fuel hoses or pipes.

FUEL INJECTORS

Testing

Note: Check the following items before testing: idle speed, ignition timing and idle CO %.

If the engine will run:

1. With the engine idling, disconnect each fuel injector connector individually and inspect the change in the idle speed.

• If the idle speed drop is almost the same for each cylinder, the fuel injectors are normal.
• If the idle speed or quality remains the same when you disconnect a particular fuel injector, replace the fuel injector and retest.

2. Check the clicking sound of each fuel injector by means of a stethoscope when the engine is idling.
3. If any fuel injector fails to make the typical clicking sound, check the sound again after replacing the fuel injector.
4. If clicking sound is still absent, check for the following.

• Short – circuiting, wire breakage or poor connection in the YEL/BLK wire between the PGM – Fi main relay and the fuel injector.
• Short – circuiting, wire breakage or poor connection in the wire between the fuel injector and the ECM.

5. If all is OK, check the ECM and PGM – Fi main relay.