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Circuit Description The control module enables the appropriate fuel injector on the intake stroke for each cylinder. An ignition 1 voltage is supplied directly to the fuel injectors. The control module controls each fuel injector by grounding the control circuit via a solid state device called a driver. Diagnostic Aids • Monitoring the fuel injector circuit status with a scan tool, while moving the fuel injector harness, may help to isolate an intermittent condition. • Performing the Fuel Injector Coil Test may help isolate an intermittent condition. Refer to Fuel Injector Solenoid Coil Test . • For an intermittent condition, refer to Intermittent Conditions . Test Description The numbers below refer to the step numbers on the diagnostic table. 4. This step tests for a short to ground on the ignition 1 voltage supply circuit of the fuel injector. 5. This step tests for an open ignition 1 voltage supply circuit between the injector fuse and a fuel injector electrical connector.