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 .
1. Select ONE INJECTOR in INSPECTION menu with the HDS. Disable each injector at a time by selecting number of an injector which you want to step. 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, faulty injector is suspected. Replace the injector and retest. 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. 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 intake manifold cover. Remove the injector connector. Measure resistance between injector (A) terminals No. 1 and No. 2. Is there 10−13 Ω?
YES | - | Go to Step 10 .
NO | - | Replace the injector. ■
1. Check the fuel pressure. 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. |