NOTE: Check the following items before testing: idle speed, ignition timing and idle CO%. Try to start the engine. Does the engine start? YES - Go to step 2. NO - Go to step 6. Turn the ignition switch OFF. Remove the air cleaner (see page 11-146). Disconnect each injector connector individually. Install the air cleaner, 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 injector, replace the injector and retest (see page 11-113). Check the clicking sound of each injector by means of a stethoscope when the engine is idling. If any fuel injector fails to make the typical clicking sound, check the sound again after replacing the injector (see page 11-113). If clicking sound is still absent, check the following. Whether there is wire breakage or poor connection in the YEL/BLK wire between the PGM-FI main relay and the junction connector. Whether the junction connector is open or corroded. Whether there is wire breakage or poor connection in the YEL/BLK wire between the junction connector and the injector. Whether there is any short-circuiting, wire breakage or poor connection in the wire between the injector and the ECM/PCM. If all is OK, the test is complete.

Turn the ignition switch OFF. Remove the air cleaner (see page 11-146). Remove the injector connector. Measure the resistance between injector (A) terminals No. 1 and No. 2. Is there 10-13 ohms? YES - Go to step 10. NO - Replace the injector (see page 11-113). Check the fuel pressure (see page 11-131). If the fuel pressure is as specified, check the following: Whether there is wire breakage, or poor connection in the YEL/BLK wire between the PGM-FI main relay and the junction connector. Whether the junction connector is open or corroded. Whether there is wire breakage, or poor connection in the YEL/BLK wire between the junction connector and the injector. Whether there is any short-circuiting, wire breakage or poor connection in the wire between the injector and the ECM/PCM. If the fuel pressure is not as specified, recheck the fuel pressure (see page 11-131).