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Test FC-20B - Injector #4 Control Circuit

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION . For appropriate wiring diagram, see WIRING DIAGRAMS  at end of article.
  1. It may be necessary to remove intake plenum to access injector connectors. Reconnect 10-pin injector connector. Disconnect injector No. 4 connector. Turn ignition on. Using DRB-II, actuate Auto Shutdown (ASD) relay. Put DRB-II in voltmeter mode.
  2. Using DRB-II, check voltage on injector No. 4 connector Dark Green/Orange wire. If voltage is less than 10 volts, repair open in Dark Green/Orange wire. If voltage is more than 10 volts, turn ignition off. Disconnect 10-pin injector connector. Using an external ohmmeter, check resistance of injector driver circuit (Light Blue/Brown wire) between injector No. 4 connector and 10-pin injector connector.
  3. If resistance is more than 5 ohms, repair open in Light Blue/Brown wire. Perform VERIFICATION PROCEDURE VER-2. If resistance is less than 5 ohms, replace injector. Perform VERIFICATION PROCEDURE VER-2.
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