PGM-FI System

Injector Test

 11-552  

NOTE: Check the following items before testing: idle speed, ignition timing and idle CO%.
  1. Try to start the engine.

Does the engine start?

YES

- Go to step 2.

NO

- Go to step 6.

  1. Turn the ignition switch OFF. Remove the air cleaner (see page 11-446).
  2. Disconnect each injector connector individually.
  3. 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 11-413).
  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 (see page 11-413).
  • 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.
  1. Turn the ignition switch OFF.
  2. Remove the air cleaner (see page 11-446).
  3. Remove the injector connector.
  4. 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 11-413).


  1. Check the fuel pressure (see page 11-431).
  • 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 11-431).