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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 253 (Engine Controls - System & Component Tests - 2.2L) >> Fuel Systems (CNG) >> Fuel Injector Coil Test >> Test Description

Test Description

WARNING: This page is about a different car, the 2003 Pontiac Sunfire, 2003 Pontiac Grand Am, 2003 Oldsmobile Alero, and 2003 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers in the diagnostic procedure.

  1. 3  - This step tests each fuel injector resistance within a specific temperature range. If any of the fuel injectors display a resistance outside of the specified value, replace the fuel injector.
  2. 4  - This step determines if all of the fuel injectors are within 0.5 ohm of each other. If the highest resistance value is within 0.5 ohm of the lowest resistance value, then all of the fuel injector coil windings are okay.
  3. 5  - This step determines which fuel injector is faulty. After subtracting the highest and lowest resistance values from the average value, replace the fuel injector that has the greatest resistance difference from the average.
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