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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 408 (Engine Controls - System Testing & Engine Component Tests - 3.1L) >> Fuel Systems >> Fuel Injector Circuit Diagnosis >> Test Description

Test Description

WARNING: This page is about a different car, the 2003 Pontiac Grand Prix, 2003 Chevrolet Malibu, and 2003 Buick Century. 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. 4  - This step tests for a short to ground on the fuel injector ignition 1 voltage supply circuit.
  2. 5  - This step tests for a short to a PCM ground on the fuel injector ignition 1 voltage supply circuit.
  3. 6  - This step tests for an open between the multi-way harness connector and the fuel injectors.
  4. 7  - This step tests for an open or high resistance between the multi-way harness connector and the fuel injectors.
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