TESTING

1. Using a stethoscope, ensure that a clicking sound is heard at the injector (when idling or cranking the engine). If a clicking noise is not heard, proceed as follows:
   1. Turn the ignition switch to the OFF position, then disconnect the control unit connector.
   2. Using an ohmmeter, measure resistance between terminal 43 (RW) and terminal 48 (RB) on the harness connector. The ohmmeter should read 0.5–2 ohms.
2. Check the injector for discontinuity as follows:
   1. Disconnect the electrical connector from the injector.
   2. Using an ohmmeter, measure the resistance between the terminals of the connector. The ohmmeter should read 0.5–2 ohms.
   3. If the readings are not as specified, replace the injector.
3. Check the injector for insulation as follows:
   1. Using an ohmmeter, measure resistance between each terminal of the connector on the injector side and ground. The ohmmeter should read 1 mega-ohm.
   2. If the readings are not as specified, replace the injector.
4. If specifications obtained in Step 1 are not as specified, but those obtained in Steps 2 and 3 are within specifications, check the harness for discontinuity and the connector for poor connection.