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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 364 (Engine Controls And Fuel - 5.3L, 6.0L & 6.2L - DTC P0443 Through DTC P3449 And Troubleshooting) >> Diagnostic Information and Procedures >> Fuel Injector Diagnosis (CH47976) >> Component Testing >> Fuel Injector Coil Test

Fuel Injector Coil Test

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Verify the resistance of each fuel injector:

  1. Ignition ON, verify the scan tool ECT temperature is between 10-32°C (50-90° F).
    • If not within the specified range, measure and record the resistance of each fuel injector with a DMM. 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 difference is greater than 3 Ω, add all of the fuel injector resistance values to obtain a total resistance value. Divide the total resistance value by the number of injectors to obtain an average resistance value. Subtract the lowest individual fuel injector resistance value from the average resistance value. Subtract the average resistance value from the highest individual injector resistance value. Replace the fuel injector that displays the greatest difference above or below the average.
  2. Test for 11-14 Ω between each fuel injector.
    • If not within the specified range, replace the fuel injector.
  3. If all the injectors test OK, refer to Active Fuel Injector Tester (AFIT) Procedure .
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