Fuel Injector Solenoid Coil Test
Diagnostic Instructions
Circuit/System Description
The engine control module (ECM) enables the appropriate fuel injector pulse for each cylinder. The ignition voltage is supplied directly to the fuel injectors. The ECM 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 too low will affect the 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 will increase as the temperature of the fuel injector increases.
Reference Information
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Hybrid Modes of Operation Description
Electrical Information Reference
Component Testing
Verify the resistance of each Q17 fuel injector with one of the following methods:
| • | If the engine coolant temperature (ECT) sensor is between 10-32°C (50-90°F), the resistance of each fuel injector should be 11-14 Ω. If the injectors measure OK, perform the Fuel Injector Balance Test. Refer to Fuel Injector Balance Test . |
| ⇒ | If not within the specified range, replace the Q17 fuel injector. |
| • | If the ECT sensor is not between 10-32°C (50-90°F), measure and record the resistance of each fuel injector. Subtract the lowest resistance value from the highest resistance value. The difference between the lowest value and the highest value should be equal to or less than 3 Ω. If the injectors measure OK, perform the Fuel Injector Balance Test. Refer to Fuel Injector Balance Test . |
| ⇒ | If not within the specified range, add all of the fuel injector resistance values to obtain a total resistance value. Divide the total resistance value by the number of fuel injectors to obtain an average resistance value. Subtract the lowest individual fuel injector resistance value from the average resistance value. Compute the difference between the highest individual fuel injector resistance value and the average resistance value. Replace the Q17 fuel injector that displays the greatest difference above or below the average. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Fuel Injector Replacement
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