Century V6-3.1L VIN J (2005)
Fuel Injector: Testing and Inspection
Fuel Injector Coil Test
FUEL INJECTOR COIL TEST
CIRCUIT DESCRIPTION
The control module enables the appropriate fuel injector on the intake stroke for each cylinder. Ignition 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. A fuel injector coil
winding resistance that is too high, or low, will affect engine driveability. A fuel injector control circuit DTC may not set, but a misfire may be
apparent. The fuel injector coil windings are affected by temperature. The resistance of the fuel injector coil windings increases as the temperature of
the fuel injector increases.
DIAGNOSTIC AIDS
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Monitoring the misfire current counters, or misfire graph, may help isolate the fuel injector that is causing the condition.
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Operating the vehicle over a wide temperature range may help isolate the fuel injector that is causing the condition.
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Perform the fuel injector coil test within the conditions of the customers concern. A fuel injector condition may only be apparent at a certain
temperature, or under certain conditions.
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If the fuel injector coil test does not isolate the condition perform the fuel injector balance test. Refer to Fuel Injector Balance Test with Special
Tool See: Fuel Injector Balance Test With special Tool or Fuel Injector Balance Test with Tech 2. See: Fuel Injector Balance Test with Tech 2
TEST DESCRIPTION
Steps 1-7
