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Injector Test

NOTE: Check the following items before testing; idle speed, ignition timing, and idle CO%.
  1. Try to start the engine.
    • If the engine starts, go to Step 2 .
    • If the engine does not start, go to Step 8 .
  1. Connect the HDS to the data link connector (DLC) (A) located under the driver's side of the dashboard.
  1. Make sure the HDS communicates with the ECM/PCM. If it doesn't, go to the DLC circuit troubleshooting.
  1. Select ONE INJECTOR in INSPECTION MENU with the HDS.
  1. Disable each injector at a time by selecting number of an injector which you want to step.
  1. 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.
  1. 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 1 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.
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect the injector connector.

  1. Measure the resistance between injector (A) terminals No. 1 and No. 2. There should be 10−13 Ω.
    • 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 1 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.